Hagues Peak

Hagues Peak

Rising in the northern reaches of Rocky Mountain National Park, Hagues Peak is a massive 13,565-foot summit that forms the highest point of Colorado’s Mummy Range. It is also the highest point in Larimer County, giving this relatively little-known thirteener an importance far beyond its elevation alone.

Modern LiDAR measurements place the summit at approximately 13,565 feet (4,135 meters). Older maps and references commonly give elevations between 13,560 and 13,573 feet.

Hagues is also exceptionally prominent for a Colorado thirteener. Modern LiDAR data gives it approximately 2,446 feet (746 meters) of topographic prominence, placing it among Colorado’s more geographically dominant summits.

Its Nearest Higher Neighbor is Longs Peak, almost 16 miles to the south. Its prominence line parent is Chiefs Head Peak.

Hagues Peak is the centerpiece of the northern Front Range high country, surrounded by Fairchild Mountain, Ypsilon Mountain, Mummy Mountain, Rowe Peak, alpine lakes, tundra, and one of Rocky Mountain National Park’s few remaining small glaciers.

That glacier—Rowe Glacier—lies directly north of Hagues Peak and occupies a special place in Colorado science. Its predecessor name, Hallett Glacier, was used when G.S. Stone published the first scientific description of a glacier in Colorado in 1887.

The mountain itself is equally interesting geologically.

It is built partly from an ancient intrusive body called the Granite of Hagues Peak, a Precambrian rock unit approximately 1.48 billion years old.

Hagues therefore combines unusually high prominence, ancient geology, a surviving glacier, county-high-point status, long wilderness approaches, and some of the finest alpine terrain in Rocky Mountain National Park.

⚡ Fast Facts

Feature	Details
Country	United States
State	Colorado
County	Larimer County
Mountain Range	Mummy Range
Greater Range	Front Range, Rocky Mountains
Protected Area	Rocky Mountain National Park
Wilderness	Rocky Mountain National Park Wilderness
Elevation	13,565 ft / 4,135 m
Older Published Elevation	13,560–13,573 ft
Prominence	Approx. 2,446 ft / 746 m
Isolation	Approx. 15.96 mi / 25.69 km
Nearest Higher Neighbor (NHN)	Longs Peak
Line Parent	Chiefs Head Peak
Key Col	Near Chapin Pass, approx. 11,119 ft
Coordinates	40.48449° N, 105.64637° W
Mountain Type	Glacially sculpted granitic mountain
Principal Rock Unit	Granite of Hagues Peak
Rock Age	Approx. 1.48 billion years
Volcanic?	No
First Recorded Ascent	Not reliably documented
Most Common Approach	Lawn Lake Trail
Easiest Summit Terrain	Approximately Class 2 via Mummy-Hagues saddle
Alternative Southwest Route	Class 2+ to Class 4 depending line
Notable Distinction	Highest summit in the Mummy Range and Larimer County
Nearby Glacier	Rowe Glacier

🗺️ Where Is Hagues Peak?

Hagues Peak lies in the northern section of Rocky Mountain National Park, northwest of Estes Park.

The mountain rises within the Mummy Range, a northern branch of Colorado’s Front Range.

Nearby summits include:

• Fairchild Mountain
• Ypsilon Mountain
• Mummy Mountain
• Rowe Peak
• Rowe Mountain
• Mount Chiquita

Farther south rises Longs Peak, the only fourteener entirely within Rocky Mountain National Park and Hagues Peak’s nearest higher mountain.

Hagues is much less accessible than many well-known Front Range summits.

No road approaches the summit closely.

No maintained trail reaches the top.

A typical climb involves many miles of hiking before the actual summit ascent even begins.

That remoteness helps preserve a markedly different character from heavily traveled mountains closer to Denver or the Bear Lake corridor.

🏔️ Highest Mountain in the Mummy Range

Hagues Peak is the highest summit of the Mummy Range.

The principal high summits include:

• Hagues Peak — 13,565 ft
• Ypsilon Mountain — 13,513 ft
• Fairchild Mountain — 13,509 ft
• Mummy Mountain — 13,420 ft
• Rowe Peak — about 13,390 ft

Several of these mountains are close enough together that experienced hikers occasionally combine them in long traverses.

Hagues remains the dominant summit.

It is not merely a few feet higher than its neighbors.

Its much greater topographic prominence shows that the entire Mummy Range ultimately rises toward Hagues as its principal mountain.

⚰️ Why Is It Called the Mummy Range?

The Mummy Range received its name from the imagined appearance of its mountain skyline.

When viewed from certain points to the south, early observers thought the profile resembled an Egyptian mummy lying horizontally.

A historic Rocky Mountain National Park mountaineering guide described the resemblance this way:

• Mummy Mountain formed the head.
• Hagues Peak formed the foot.
• The remaining ridges completed the imagined body.

The resemblance requires some imagination, but the name endured.

Today, the Mummy Range is one of the principal mountain groups within Rocky Mountain National Park.

📏 Updated Elevation

Older Mountain Field Guide material gave Hagues Peak an elevation of:

13,573 feet.

Current LiDAR-based Colorado summit databases give:

13,565 feet / 4,135 meters.

The older USGS contour-map figure was approximately:

13,560 feet.

Why do several elevations exist?

Differences can result from:

• Older surveying techniques
• Vertical datums
• Contour interpolation
• GPS measurements
• Modern LiDAR analysis

LiDAR uses airborne laser measurements to create extremely detailed models of the land surface.

For consistency with current Colorado peak databases, 13,565 feet is the best elevation to use.

📐 Prominence

Hagues Peak’s prominence is even more notable than its elevation.

Modern LiDAR analysis gives approximately:

2,446 feet / 746 meters

of topographic prominence.

Older contour-based estimates generally ranged around 2,405–2,420 feet.

Its LiDAR key saddle lies around:

11,119 feet.

That saddle occurs along the mountain system leading south toward higher Front Range terrain.

A prominence of more than 2,400 feet is substantial for Colorado.

Many fourteeners have considerably less.

Hagues therefore ranks as one of the state’s more geographically independent high mountains despite falling more than 400 feet short of fourteener status.

🧭 Nearest Higher Neighbor: Longs Peak

Hagues Peak’s Nearest Higher Neighbor is Longs Peak.

Longs rises approximately:

15.7–16 miles south

of Hagues.

Current LiDAR measurements place Longs above 14,250 feet.

The large distance to higher terrain demonstrates how strongly Hagues dominates the northern Front Range.

Several major mountains lie between them, but none exceeds Hagues Peak.

🧭 Line Parent: Chiefs Head Peak

Hagues Peak has an interesting distinction between its Nearest Higher Neighbor and its line parent.

Its NHN is:

Longs Peak

Its prominence line parent is:

Chiefs Head Peak

This happens because topographic parentage follows the particular chain of ridges and key saddles connecting a summit toward higher terrain.

The physically closest higher summit is not always identical to the line parent determined through prominence analysis.

Including both gives a more complete picture of Hagues Peak’s place within the Front Range.

🏆 Larimer County High Point

Hagues Peak is the highest point in Larimer County.

Larimer County extends from the Great Plains near Fort Collins westward deep into the Rocky Mountains.

Its terrain therefore ranges from relatively low plains to more than:

13,500 feet above sea level.

Hagues marks the upper extreme.

This makes it a significant destination for hikers attempting Colorado’s county high points.

County highpointing can produce very different challenges from fourteener climbing.

Some county high points are accessible by short hikes.

Hagues requires a major wilderness day with a long approach and extensive travel above treeline.

📊 How High Does Hagues Rank in Colorado?

Current LiDAR rankings place Hagues Peak around:

#211 among Colorado’s ranked summits

by elevation.

That number may not sound extraordinary in a state containing hundreds of mountains above 13,000 feet.

Prominence tells another story.

Hagues ranks much higher when Colorado mountains are ordered by topographic prominence.

Its roughly 2,446 feet of rise places it among the state’s most geographically dominant peaks.

This demonstrates why elevation alone provides an incomplete picture of a mountain.

🪨 Geology of Hagues Peak

Hagues Peak is built from some of the oldest rocks exposed in Rocky Mountain National Park.

A major local rock unit is appropriately named:

Granite of Hagues Peak

This ancient intrusive igneous rock formed approximately:

1.48 billion years ago

during the Proterozoic Eon.

It is much older than the modern Rocky Mountains.

The Rockies themselves did not begin taking their present form until more than a billion years later.

🔬 Granite of Hagues Peak

Geologists describe the Granite of Hagues Peak as a coarse to very coarse-grained intrusive rock.

It contains minerals dominated by:

• Quartz
• Feldspar
• Biotite mica

Large feldspar crystals can occur within the rock, producing a distinctly porphyritic texture.

The granite extends through portions of:

• Hagues Peak
• Mummy Mountain
• Stormy Peaks

Its presence is important enough that geologists use Granite of Hagues Peak as a formal mapping unit across part of the northern Front Range.

🔥 Magma Deep Underground

The Granite of Hagues Peak began as molten rock deep beneath Earth’s surface.

It did not erupt as lava.

Instead, magma intruded into older crust and cooled slowly underground.

Slow cooling allowed crystals to grow relatively large.

Later geological events eventually exposed this once deeply buried rock.

That required the removal of enormous quantities of overlying material.

The summit of Hagues Peak therefore exposes rock that originally formed kilometers below an ancient land surface.

❌ Is Hagues Peak a Volcano?

No.

Hagues Peak is not volcanic.

Its granite is igneous, but igneous does not automatically mean volcanic.

There are two broad ways magma creates rock.

Extrusive

Magma reaches Earth’s surface as lava or explosive material.

These are volcanic rocks.

Intrusive

Magma cools underground.

These are plutonic or intrusive rocks.

Hagues Peak belongs primarily to the second category.

Its granite crystallized deep underground and was later exposed through uplift and erosion.

🌎 Ancient Mountain Building

The rocks of Rocky Mountain National Park preserve a geological history approaching two billion years.

Long before the modern Rockies, ancient plate collisions created and metamorphosed crust in what is now Colorado.

Later intrusive events injected granitic magma.

The Hagues Peak granite formed during one of these Proterozoic episodes roughly 1.48 billion years ago.

Another major intrusive event produced the younger Silver Plume Granite around 1.42 billion years ago.

The modern mountains are therefore constructed from rocks formed during geological events vastly older than the mountain landscape itself.

🏔️ Building the Modern Rocky Mountains

The modern Rocky Mountains began rising mainly during the Laramide Orogeny, beginning roughly 70 million years ago.

Enormous tectonic forces compressed and uplifted western North America.

Ancient basement rocks that had spent hundreds of millions of years buried beneath younger sediment were gradually lifted.

Erosion stripped away much of the younger cover.

Eventually, the old crystalline core became exposed.

Hagues Peak’s ancient granite now stands more than 13,500 feet above sea level because of tectonic events that occurred more than a billion years after the granite itself crystallized.

🧊 Ice Sculpted the Mountain

Tectonics raised the mountains.

Glaciers shaped much of the landscape seen today.

During the Pleistocene, enormous glaciers occupied valleys throughout Rocky Mountain National Park.

Ice flowed through the Mummy Range and carved:

• Cirques
• U-shaped valleys
• High basins
• Steep cliffs
• Moraines
• Alpine lake basins

The broad valleys around Lawn Lake and the steep northern slopes near Rowe Glacier preserve this glacial history.

🧊 Rowe Glacier

One of Hagues Peak’s most fascinating features lies just north of the summit.

Rowe Glacier occupies a high cirque between Hagues Peak and Rowe Peak.

It is one of the small remaining glaciers or perennial ice masses within Rocky Mountain National Park.

The glacier is dramatically smaller than the enormous ice that occupied the region during the Pleistocene.

Yet its survival at all is remarkable.

Shade, wind-deposited snow, high elevation, and favorable terrain help maintain the ice.

🔬 Colorado’s First Scientifically Described Glacier

Rowe Glacier holds an important place in Colorado scientific history.

In 1887, geologist G.S. Stone published what the National Park Service identifies as the first scientific description of an existing glacier in Colorado.

At the time, the ice body was known as Hallett Glacier.

The name later changed to Rowe Glacier.

Older sources also used names including Mummy Glacier.

The glacier was eventually named for Israel Rowe, who reportedly discovered the ice mass while bear hunting in 1880.

Today, Rowe Glacier is a small remnant of what earlier observers saw.

💧 Source of the North Fork Big Thompson

Rowe Glacier also has hydrological importance.

Meltwater from the glacier contributes to the North Fork of the Big Thompson River.

The water eventually follows this route:

North Fork Big Thompson River → Big Thompson River → South Platte River → Platte River → Missouri River → Mississippi River → Gulf of Mexico

Hagues Peak therefore stands near the headwaters of a drainage system extending across much of the central United States.

🏔️ Glacial Cirques

A cirque is a bowl-shaped depression carved at the head of a mountain valley by glacier ice.

Hagues and its neighboring summits contain several classic alpine cirques.

As snow accumulated in sheltered high basins, it compressed into glacier ice.

The moving ice:

• Plucked rock from cliffs
• Ground against bedrock
• Deepened basins
• Steepened headwalls

When the glaciers later retreated, alpine lakes and talus-filled basins remained.

The modern landscape around Hagues is therefore the product of both ancient granite and relatively recent glacial carving.

🗣️ Why Is It Called Hagues Peak?

Hagues Peak was named for James and Arnold Hague, brothers who worked as geologists and surveyors during the nineteenth century.

They participated in geological investigations of the western United States during an era when the Rocky Mountains were being scientifically mapped in detail.

Early maps created some confusion.

Historic National Park Service mountaineering literature notes that the name Hagues Peak was applied on some early maps to the summit now called Mummy Mountain.

The naming was later standardized in the form used today.

The modern Hagues Peak is the highest point of the range.

🥇 First Ascent

A definitive first recorded ascent of Hagues Peak is not clearly established.

This is not unusual for accessible high peaks explored during Colorado’s nineteenth-century surveying era.

By the late nineteenth and early twentieth centuries, geologists, surveyors, hunters, and mountaineers were already traveling extensively through the Mummy Range.

Historic park mountaineering guides describe Hagues as an established climbing objective.

Without a reliable primary record identifying the earliest summit party, assigning a specific first-ascent date would be speculative.

It is better to record the first ascent as:

Unknown / not reliably documented.

🥾 Climbing Hagues Peak

Hagues Peak has no maintained trail to the summit.

Most climbers reach it through one of two broad approaches:

1. Lawn Lake and the Mummy-Hagues saddle
2. Lawn Lake and the Fairchild-Hagues saddle

A longer Mummy Range traverse from Chapin Pass is another possibility.

The easiest summit terrain can generally be kept around Class 2.

Other lines, particularly close to the southwest ridge crest, involve:

• Class 3 scrambling
• Isolated Class 4 moves
• Significant exposure

Route choice matters enormously.

🥾 Lawn Lake Approach

The most intuitive access begins at the Lawn Lake Trailhead inside Rocky Mountain National Park.

The trailhead sits at approximately:

8,525 feet.

The Lawn Lake Trail climbs gradually through forest along the Roaring River drainage.

Lawn Lake lies roughly:

6.2 miles from the trailhead

at approximately:

10,990 feet.

Reaching the lake already requires a substantial hike.

Hagues Peak rises beyond the lake, meaning summit climbers still face several additional miles and thousands of feet of climbing.

🌊 Lawn Lake

Lawn Lake lies beneath the high Mummy Range.

The basin provides views toward:

• Fairchild Mountain
• Hagues Peak
• Mummy Mountain

The lake is a popular backpacking destination in its own right.

For Hagues climbers, it marks the transition from a long maintained-trail approach toward increasingly remote alpine terrain.

A designated wilderness camping area near Lawn Lake can allow climbers to divide the journey into two days.

Overnight camping requires an appropriate Rocky Mountain National Park wilderness permit.

💥 The 1982 Lawn Lake Flood

The approach trail follows the Roaring River through terrain dramatically altered by the Lawn Lake flood of 1982.

On July 15, 1982, the old Lawn Lake Dam failed.

A huge volume of water rushed down the Roaring River.

The flood:

• Scoured the valley
• Carried enormous boulders
• Destroyed vegetation
• Created the Alluvial Fan downstream
• Changed sections of the river corridor

Evidence of the event remains visible along portions of the approach.

The landscape is a reminder that mountain terrain changes through sudden catastrophic events as well as slow erosion.

🧭 Route via Mummy-Hagues Saddle

For climbers seeking the least technical summit route, the Mummy-Hagues saddle is generally the better choice.

From the Lawn Lake area, climbers can leave the maintained trail and ascend toward the broad saddle between:

• Hagues Peak
• Mummy Mountain

The terrain includes:

• Alpine grass
• Tundra
• Talus
• Loose rock

Once the saddle is reached, the summit can generally be approached on Class 2 terrain by choosing the easier side of the ridge and avoiding unnecessary scrambling.

This is the best option for hikers interested in reaching the summit without intentionally seeking technical moves.

🧗 Fairchild-Hagues Saddle Route

Another approach reaches the saddle between:

• Fairchild Mountain
• Hagues Peak

This route creates a much more visually dramatic final climb.

From the saddle, Hagues rises sharply toward the northeast.

The first portion can be mostly Class 2.

Higher up, staying directly on the rocky ridge can lead into:

• Class 3 terrain
• Isolated Class 4 moves
• Greater exposure

A careful climber can often bypass much of the hardest scrambling by moving away from the ridge crest.

Different route descriptions therefore give very different difficulty ratings for what appears to be the same general mountain approach.

🧗 Why Route Ratings Differ

One source may call Hagues Peak:

Class 2

Another may call it:

Class 4

Both can be correct.

The upper mountain contains numerous route choices.

A climber seeking the easiest terrain can avoid many obstacles.

A climber following the most direct ridge line may encounter steep blocks and technical moves.

This is a useful reminder that Yosemite Decimal System grades describe routes, not mountains.

Hagues Peak does not have one universal climbing grade.

📏 How Long Is the Climb?

The answer depends strongly on route.

A Lawn Lake summit day can easily approach:

18–20 miles round trip

with more than:

5,000 feet of net elevation gain

and considerably more cumulative climbing depending on the saddle and ridge used.

One documented route via the Fairchild-Hagues saddle totals approximately:

• 18.1 miles round trip
• 7,050 feet of cumulative elevation gain

This makes Hagues a major endurance objective even when the technical climbing is kept easy.

🥾 Mummy Range Traverse

Strong hikers sometimes climb Hagues as part of a much larger Mummy Range traverse.

A traverse can include combinations of:

• Mount Chapin
• Mount Chiquita
• Ypsilon Mountain
• Fairchild Mountain
• Hagues Peak
• Mummy Mountain

This produces one of the great high-altitude ridge days in Rocky Mountain National Park.

It is also extremely demanding.

A full traverse may involve:

• Multiple large elevation losses
• Repeated climbs
• Long tundra crossings
• Talus
• Route-finding
• Two-vehicle logistics

It should not be underestimated simply because many individual segments are technically easy.

🌩️ Thunderstorms

Summer thunderstorms are one of the greatest hazards on Hagues Peak.

Much of the upper route lies above treeline.

Once a climber reaches the exposed Mummy Range ridges, shelter is limited.

Storms may bring:

• Lightning
• Hail
• Heavy rain
• Strong wind
• Sudden cold
• Poor visibility

Because the approach is so long, summit attempts usually require an extremely early start.

The objective is not merely to reach the summit before storms develop.

Climbers need enough time to descend well below exposed ridges.

❄️ Snow and Ice

Snow can remain in the Mummy Range well into summer.

High routes may cross:

• Hard snowfields
• Cornices
• Icy slopes
• Wind-loaded snow

The mountain is substantially more difficult outside dry summer conditions.

A 1982 accident on Hagues illustrates the danger.

Two climbers lost their footing while descending hard snow and slid uncontrolled.

Neither was equipped adequately for the conditions.

Depending on season, climbers may need:

• Microspikes or crampons
• Ice axe
• Snow-climbing skill
• Avalanche knowledge

Summer route descriptions should not be applied blindly to spring or winter conditions.

🫁 Altitude

Hagues Peak rises above:

13,500 feet.

Altitude can cause:

• Headache
• Nausea
• Fatigue
• Dizziness
• Shortness of breath
• Loss of coordination

The long approach adds another challenge.

A climber may feel strong at Lawn Lake but become significantly slower above 12,000 feet.

Visitors arriving directly from low elevation should allow time to acclimatize.

If altitude symptoms worsen, descent is the appropriate response.

📅 Best Time to Climb Hagues Peak

For ordinary hiking and scrambling, the most reliable period is generally:

July through September.

🌨️ June

Snow commonly remains on high approaches and ridges.

Technical snow equipment may be necessary.

🌼 July

Snow progressively retreats.

Wildflowers bloom in tundra and meadows.

Afternoon thunderstorms become a major concern.

☀️ August

Often provides the best chance for mostly dry summit terrain.

Lightning remains a serious risk.

🍂 September

Cooler temperatures and clearer mornings can produce excellent climbing.

Early-season snowstorms become increasingly possible.

❄️ October Through May

Winter conditions dominate.

Snow, avalanche hazards, wind, and extreme cold can turn the mountain into a serious mountaineering objective.

🎫 2026 Rocky Mountain National Park Timed Entry

Hagues Peak lies entirely within Rocky Mountain National Park.

For the 2026 season, the park requires a timed-entry reservation for most areas between:

9 a.m. and 2 p.m. from May 22 through October 12, 2026.

The Lawn Lake Trailhead lies outside the Bear Lake Road corridor, so the standard Timed Entry reservation—not Timed Entry + Bear Lake—is the relevant option.

Hagues climbers commonly enter well before 9 a.m. because of the length of the route.

Under the 2026 system, visitors entering before 9 a.m. do not need a timed-entry reservation for this portion of the park.

However:

A valid park entrance pass or entrance fee is always required.

Future years may use different rules, so always check the current park system before traveling.

🏕️ Wilderness Camping

Climbers who want to divide the route into two days can camp at designated wilderness sites such as the Lawn Lake area.

Rocky Mountain National Park does not allow unrestricted at-large camping.

Overnight wilderness trips require:

• A wilderness permit
• Use of the assigned site or zone
• Compliance with current food-storage rules
• Leave No Trace practices

The Lawn Lake designated sites sit approximately 6.2 miles from the trailhead and near 11,000 feet.

Sleeping there can make summit day considerably shorter.

🐕 Dogs Are Not Allowed

Dogs and other pets are prohibited on all trails, tundra, and meadows in Rocky Mountain National Park.

That includes:

• Lawn Lake Trail
• Off-trail summit approaches
• Alpine tundra around Hagues Peak

Leashed pets are permitted only in certain developed areas, roads, parking areas, campgrounds, and picnic areas.

Do not bring a dog on a Hagues Peak climb.

🌿 Flora and Fauna

Hagues Peak rises through two of Rocky Mountain National Park’s defining ecosystems:

• Subalpine forest
• Alpine tundra

The Lawn Lake approach begins below treeline in thick forest.

Higher up, trees disappear.

By the time climbers reach the high saddles surrounding Hagues, they are traveling through one of the most severe biological environments in Colorado.

Despite the harsh climate, the Mummy Range supports an impressive range of specialized plants and animals.

🌲 Engelmann Spruce

Engelmann spruce is one of the dominant trees of Rocky Mountain National Park’s subalpine forests.

It commonly grows between roughly:

9,000 and 11,500 feet.

The tree is exceptionally cold tolerant.

Lower in the forest, Engelmann spruce can grow tall and straight.

Near treeline, wind and cold distort growth.

Trees may become:

• Short
• Twisted
• One-sided

Some wind-sculpted trees near treeline are centuries old despite appearing small.

🌲 Subalpine Fir

Subalpine fir grows alongside Engelmann spruce through much of the high forest.

It tolerates:

• Heavy snow
• Long winters
• Short summers
• Cold soils

Its narrow spire-like shape helps shed snow.

Near treeline, subalpine fir becomes increasingly stunted.

Eventually, trees survive only in protected depressions or behind rocks.

🌲 Krummholz

At treeline, severe wind prevents normal tree growth.

Spruce and fir become krummholz—German for “crooked wood.”

These trees may grow horizontally rather than vertically.

Snow cover can actually protect the lowest branches from winter winds.

A krummholz tree only a few feet tall may be hundreds of years old.

Above this narrow transition zone, trees disappear entirely and alpine tundra begins.

🌱 Alpine Tundra

Rocky Mountain National Park’s alpine tundra begins around:

11,000–11,500 feet

depending on exposure.

Hagues Peak rises roughly 2,000 feet above that transition.

The tundra environment includes:

• Strong wind
• Intense ultraviolet radiation
• Thin soil
• Freezing nights
• Short growing seasons

Plants respond by remaining low to the ground.

Many grow in compact mats or cushions.

🌼 Alpine Wildflowers

Despite the harsh climate, summer brings colorful tundra flowers.

Species found within the park include:

• Alpine avens
• Alpine forget-me-not
• Moss campion
• Sky pilot
• Alpine paintbrush
• Alpine phlox
• Alpine bistort
• Dwarf clover
• Snow buttercup

Many bloom for only a few weeks.

Plants may require years to recover from trampling.

Off-trail hikers should use durable rock surfaces whenever possible rather than walking directly across vegetation.

🐿️ American Pika

The American pika is one of the characteristic animals of Hagues Peak’s talus.

These small relatives of rabbits live among broken rocks.

Pikas do not hibernate.

During summer, they collect plants and create hay piles.

The stored vegetation provides winter food beneath deep snow.

Their high-pitched calls often reveal their presence before hikers see them.

🐿️ Yellow-Bellied Marmot

Yellow-bellied marmots also inhabit alpine and subalpine rock.

Unlike pika, marmots hibernate through much of winter.

They spend summer feeding heavily to build fat reserves.

Marmots are often seen sunning themselves on rocks.

They should never be fed.

Human food can alter natural behavior and create dangerous wildlife interactions.

🐦 White-Tailed Ptarmigan

The white-tailed ptarmigan is one of the most specialized alpine birds in North America.

It spends its entire year in high mountain environments.

Its plumage changes seasonally.

During summer, mottled feathers provide camouflage among rocks.

During winter, it becomes almost completely white.

Even its legs and feet are feathered for protection from the cold.

The Mummy Range provides excellent ptarmigan habitat.

🐏 Bighorn Sheep

Rocky Mountain National Park is famous for Rocky Mountain bighorn sheep.

These animals are superbly adapted to steep terrain.

Their hooves provide traction on:

• Rock
• Talus
• Cliffs

Bighorn sheep use alpine tundra extensively during summer.

They often descend during winter toward lower areas such as Horseshoe Park, where mineral-rich natural licks have historically attracted herds.

Give sheep substantial space if encountered.

🦌 Elk

Elk are better known from Rocky Mountain National Park’s lower valleys, but they also move into alpine tundra during summer.

High meadows provide:

• Grasses
• Forbs
• Alpine willow

As autumn approaches, elk descend.

The bugling rut in lower valleys is one of the park’s most famous seasonal wildlife events.

🦊 Alpine Predators

The broader park ecosystem also supports predators including:

• Coyote
• Red fox
• Mountain lion
• Bobcat
• Long-tailed weasel

Most are rarely encountered near Hagues Peak’s summit.

Their presence nevertheless demonstrates how high alpine ecosystems remain connected with forests and valleys below.

🧊 Flora Near Rowe Glacier

Conditions around Rowe Glacier are even harsher than those on ordinary alpine tundra.

The landscape consists primarily of:

• Ice
• Snow
• Talus
• Bare granite

Plant cover becomes extremely sparse.

Only specially adapted lichens, mosses, and tiny vascular plants can occupy protected surfaces near the ice.

The glacier zone forms the upper ecological limit of the Hagues Peak landscape.

🌎 Climate Change and Alpine Habitat

High mountain ecosystems are particularly sensitive to warming temperatures.

Alpine species cannot simply migrate indefinitely uphill.

Eventually, there is no higher terrain available.

Species of particular concern in Colorado’s alpine environments include animals such as:

• American pika
• White-tailed ptarmigan
• Alpine birds

Shrinking snowfields and small glaciers also provide visible evidence of long-term climatic change.

Rowe Glacier has declined dramatically since nineteenth-century observations.

🧊 Is Rowe Glacier Disappearing?

Rowe Glacier is far smaller than it was when early observers documented it.

Historic National Park Service material from the twentieth century already noted substantial loss of ice.

Modern photographs show continued shrinkage.

Whether a very small ice body meets the strict scientific definition of an active glacier depends on whether it still demonstrates sustained internal movement.

NPS nevertheless continues to include Rowe among Rocky Mountain National Park’s small named glaciers and ice masses.

Whatever terminology is used, its decline is unmistakable.

🌄 Summit Views

The summit of Hagues Peak provides an extraordinary view across northern Rocky Mountain National Park.

Nearby mountains include:

• Fairchild Mountain
• Ypsilon Mountain
• Mummy Mountain
• Rowe Peak
• Mount Chiquita

To the south, climbers can identify Longs Peak and the central park skyline.

Other visible features can include:

• Lawn Lake
• Crystal Lake
• Rowe Glacier
• Never Summer Mountains
• Continental Divide
• Estes Park region
• Northern Front Range

The summit’s 15-plus miles of isolation from higher terrain creates an unusually open horizon.

⛰️ Nearby Mountains

Ypsilon Mountain

Ypsilon Mountain rises southwest of Hagues to approximately 13,513 feet.

It is one of the Mummy Range’s major summits and has Hagues Peak as its NHN.

Its famous Y-shaped couloirs inspired the name Ypsilon.

Fairchild Mountain

Fairchild Mountain reaches approximately 13,509 feet southwest of Hagues.

The deep saddle between Fairchild and Hagues forms one of the principal summit approaches.

Mummy Mountain

Mummy Mountain rises southeast of Hagues to approximately 13,420 feet.

Despite giving the range its name, it is not the highest summit.

Hagues Peak is Mummy Mountain’s nearest higher neighbor.

Rowe Peak

Rowe Peak rises immediately north of Hagues.

Rowe Glacier occupies the high basin between the peaks.

The summit can be combined with Hagues by experienced hikers undertaking a longer ridge route.

Longs Peak

Longs Peak rises almost 16 miles south and is Hagues Peak’s Nearest Higher Neighbor.

At more than 14,250 feet, it is the highest mountain in Rocky Mountain National Park.

Chiefs Head Peak

Chiefs Head Peak lies in the central park high country near Longs Peak.

Prominence analysis identifies it as Hagues Peak’s line parent.

📊 Hagues Peak vs. Longs Peak

Feature	Hagues Peak	Longs Peak
Elevation	13,565 ft	~14,259 ft
Prominence	~2,446 ft	~2,947 ft
Isolation	~15.96 mi	~43.6 mi
Range	Mummy Range	Front Range
Park Status	RMNP	RMNP
County High Point	Larimer County	No
Fourteener?	No	Yes
NHN Relationship	Longs is Hagues’ NHN	Higher terrain lies much farther south
Standard Summit Character	Long wilderness scramble	Major exposed alpine route

Longs is nearly 700 feet higher.

Hagues is still an exceptionally prominent and geographically dominant mountain.

📊 Hagues Peak vs. Ypsilon Mountain

Feature	Hagues Peak	Ypsilon Mountain
Elevation	13,565 ft	13,513 ft
Prominence	~2,446 ft	~1,162 ft
Isolation	~15.96 mi	~2.62 mi
NHN	Longs Peak	Hagues Peak
Range	Mummy Range	Mummy Range
County High Point?	Yes	No

Only about 50 vertical feet separate the two summits.

Topographically, however, Hagues is much more dominant.

❓ Frequently Asked Questions

How high is Hagues Peak?

Modern LiDAR measurements place Hagues Peak at approximately 13,565 feet (4,135 meters).

Why do older sources say 13,573 feet?

Older surveys, datum conversions, and topographic methods produced several slightly different figures.

Current Colorado LiDAR summit databases use approximately 13,565 feet.

Where is Hagues Peak?

It is in the Mummy Range of Rocky Mountain National Park, northwest of Estes Park, Colorado.

Is Hagues Peak the highest mountain in the Mummy Range?

Yes.

It is the range high point.

Is Hagues Peak a county high point?

Yes.

It is the highest point in Larimer County.

What is Hagues Peak’s Nearest Higher Neighbor?

Longs Peak.

What is Hagues Peak’s line parent?

Chiefs Head Peak.

How prominent is Hagues Peak?

Modern LiDAR data gives approximately 2,446 feet (746 meters) of prominence.

How isolated is Hagues Peak?

Approximately 15.96 miles (25.7 kilometers).

Is Hagues Peak a fourteener?

No.

It is a Colorado thirteener.

Is Hagues Peak volcanic?

No.

It is built partly from ancient intrusive granite approximately 1.48 billion years old.

What is the Granite of Hagues Peak?

It is a Precambrian intrusive rock unit exposed in Hagues Peak, Mummy Mountain, and nearby northern Front Range terrain.

Who was Hagues Peak named after?

Geologists and surveyors James and Arnold Hague.

Who first climbed Hagues Peak?

A definitive first-ascent record has not been reliably established.

Is there a trail to the summit?

No.

Maintained trails reach the Lawn Lake area, but the final summit climb is off trail.

What is the easiest route?

The approach from Lawn Lake toward the Mummy-Hagues saddle can generally keep summit terrain around Class 2 under dry summer conditions.

Why do some guides call it Class 4?

Routes approaching from the Fairchild-Hagues saddle can encounter Class 3 and isolated Class 4 terrain if climbers remain close to the ridge crest.

Easier bypasses exist.

How long is the climb?

Depending on route, a Hagues Peak day can approach 18–20 miles with more than 5,000 feet of elevation gain.

Is Hagues Peak suitable for beginners?

Not generally.

Even if the technical terrain is kept at Class 2, the mountain requires:

• Long-distance endurance
• Off-trail navigation
• High-altitude experience
• Weather judgment
• Wilderness self-sufficiency

When is the best time to climb?

Usually July through September for the best chance of mostly dry terrain.

Is there a glacier near Hagues Peak?

Yes.

Rowe Glacier lies immediately north of the summit.

Why is Rowe Glacier important?

Its predecessor, then called Hallett Glacier, became the subject of the first scientific description of a Colorado glacier in 1887.

Can you camp at Lawn Lake?

Yes, at designated wilderness sites with the appropriate Rocky Mountain National Park wilderness permit.

Are dogs allowed?

No.

Pets are prohibited on all trails, tundra, and meadows inside Rocky Mountain National Park.

Do you need a timed-entry reservation?

For 2026, timed entry is required for the main park outside Bear Lake Road between 9 a.m. and 2 p.m. from May 22 through October 12.

Climbers entering before 9 a.m. do not need the timed-entry reservation, but a valid entrance pass or fee is still required.

⭐ Why Hagues Peak Is Special

Hagues Peak does not have the recognition of Longs Peak.

It does not reach 14,000 feet.

There is no paved road approaching its upper slopes and no maintained summit trail.

Yet Hagues is one of the most geographically important mountains in northern Colorado.

At 13,565 feet, it is the highest summit of the Mummy Range.

It is the highest point in Larimer County.

More than 2,400 feet of topographic prominence separate it from its key saddle.

Higher terrain does not appear for almost 16 miles.

Its geology is equally remarkable.

The mountain exposes granite approximately 1.48 billion years old, formed deep beneath the surface when the geography of North America bore little resemblance to the continent seen today.

More than a billion years later, tectonic forces raised the modern Rocky Mountains.

Then glaciers carved the high basins, cirques, ridges, and valleys surrounding the summit.

One small piece of that glacial story survives immediately north of the mountain.

Rowe Glacier is now only a remnant of its former size, but it holds an important place in Colorado science as the site associated with the state’s first scientific description of a glacier.

The ecosystems surrounding Hagues add another layer.

A climber begins among Engelmann spruce and subalpine fir.

Trees gradually become twisted krummholz.

Then they disappear.

Above treeline, alpine avens and tiny cushion plants hug the ground while pika collect hay among granite talus. Marmots feed during the brief summer. White-tailed ptarmigan remain in the tundra all year, and bighorn sheep move confidently across rocky high terrain.

Reaching the summit requires effort.

The Lawn Lake approach alone is longer than many complete Colorado summit hikes.

Beyond it, the maintained trail disappears and climbers must choose their own line through tundra, talus, and high ridge terrain.

That remoteness is part of the appeal.

Hagues Peak is a mountain where topography, geology, glaciology, wildlife, wilderness, and mountaineering history all intersect.

It may stand below Colorado’s famous fourteeners in elevation, but by almost every other measure, Hagues Peak is one of the great mountains of Rocky Mountain National Park.

🔗 Related Articles

• Longs Peak
• Chiefs Head Peak
• Front Range
• The Rocky Mountains
• The 10 Highest Peaks in Colorado
• Mountain Ranges in the U.S.

📚 Sources

• Peakbagger — Hagues Peak
• Lists of John — Hagues Peak
• 14ers.com — Hagues Peak via The Saddle
• Climb13ers — Hagues Peak
• National Park Service — Rocky Mountain National Park Geodiversity Atlas
• U.S. Geological Survey — Geologic Map of the Fort Collins Quadrangle
• National Park Service — Glaciers in Rocky Mountain National Park
• National Park Service — Glacier Research in Rocky Mountain National Park
• National Park Service — Alpine Tundra Ecosystem
• National Park Service — Subalpine Ecosystem
• National Park Service — Plants of Rocky Mountain National Park
• National Park Service — 2026 Timed Entry Permit System
• National Park Service — Wilderness Camping FAQ
• National Park Service — Pets in Rocky Mountain National Park
• National Park Service History — Mountaineering in Rocky Mountain National Park