The Wicklow Mountains form Ireland’s largest continuous upland region, spreading across the heart of County Wicklow and extending into parts of Dublin, Carlow, and Wexford. Characterized by rounded granite summits, sweeping blanket bogs, deep glacial valleys, mountain lakes, and historic settlements, the range contains some of the most recognizable landscapes in eastern Ireland.
At 925 meters (3,035 feet), Lugnaquilla is the highest summit in the Wicklow Mountains. Yet elevation tells only part of the story. The range is equally notable for Glendalough’s glacial valley, the isolated moorlands around Sally Gap, its extensive network of hiking trails, and a geological history stretching back hundreds of millions of years.
🏔️ Overview
The Wicklow Mountains, known in Irish as Sléibhte Chill Mhantáin, occupy a broad upland area immediately south of Dublin. Most of the range lies within County Wicklow, although its northern mountains extend into County Dublin and its southern and western margins reach parts of Carlow and Wexford.
The mountains run generally from northeast to southwest. Rather than sharp alpine peaks, much of the range consists of broad ridges and rounded summits separated by deep valleys and extensive peatlands.
Glacial erosion dramatically modified the landscape during the Pleistocene, producing the U-shaped valleys, corries, ribbon lakes, steep valley walls, and rocky gorges visible today.
A large portion of the central mountains is protected within Wicklow Mountains National Park, which covers almost 23,000 hectares and is the largest of Ireland’s national parks.
⚡ Fast Facts
| Fact | Details |
|---|---|
| Continent | Europe |
| Country | Ireland |
| Province | Leinster |
| Counties | Wicklow, Dublin, Carlow, Wexford |
| Mountain System | Leinster Chain |
| Highest Peak | Lugnaquilla |
| Highest Elevation | 925 m / 3,035 ft |
| Second-Highest Peak | Mullaghcleevaun — 849 m / 2,785 ft |
| Main Rock Types | Granite, mica-schist, quartzite |
| Mountain-Building Event | Caledonian Orogeny |
| General Orientation | Northeast to southwest |
| Approximate Range Coordinates | 53.0811° N, 6.3900° W |
| Protected Area | Wicklow Mountains National Park |
| National Park Area | Almost 23,000 hectares |
| Major Mountain Passes | Sally Gap, Wicklow Gap |
| Notable Landscape Features | Blanket bogs, glacial valleys, corrie lakes, forests, mountain streams |
Note: Prominence, isolation, parent peak, and nearest higher neighbor are measurements normally applied to individual summits rather than entire mountain ranges. For those figures, see the Mountain Field Guide profile of Lugnaquilla.
đź“Ť Location
The Wicklow Mountains dominate the interior of County Wicklow in eastern Ireland, beginning close to the southern outskirts of Dublin and continuing south toward the boundary with the Blackstairs Mountains.
The northern portion of the range within County Dublin is commonly known as the Dublin Mountains.
The mountains form a natural divide between Ireland’s east coast and the lower country farther inland. Despite their wild appearance, many parts of the range are within relatively easy reach of Dublin.
Two of the best-known road crossings are Sally Gap and Wicklow Gap. These high passes provide access through the uplands while offering views across peat bog, mountain ridges, lakes, and valleys.
đź“Ź Elevation & Major Peaks
Although the Wicklow Mountains are modest in elevation compared with the Alps or other major European ranges, their exposed terrain and proximity to the Atlantic create genuine mountain conditions.
There are dozens of substantial summits throughout the range, including numerous peaks above 600 meters.
| Mountain | Elevation |
|---|---|
| Lugnaquilla | 925 m / 3,035 ft |
| Mullaghcleevaun | 849 m / 2,785 ft |
| Tonelagee | 817 m / 2,680 ft |
| Kippure | 757 m / 2,484 ft |
| Djouce | 725 m / 2,379 ft |
Lugnaquilla
Lugnaquilla is the undisputed high point of the range at 925 meters. It is also the highest mountain in County Wicklow and the province of Leinster.
Its broad summit plateau and surrounding glacial features contrast with the sharper profiles of some of the range’s schist-based mountains.
Mullaghcleevaun
At 849 meters, Mullaghcleevaun is the second-highest summit in the Wicklow Mountains. Its northern side contains a deep glacial corrie occupied by Cleevaun Lough.
Tonelagee
Tonelagee, reaching 817 meters, rises along the central spine of the range. The mountain overlooks the distinctive corrie lake of Lough Ouler.
Kippure
The 757-meter Kippure stands near the northern end of the range on the Wicklow-Dublin boundary. Its summit transmission mast makes it particularly easy to recognize from surrounding areas.
Djouce
At 725 meters, Djouce is one of the better-known hiking mountains in northeastern Wicklow. Its location near Lough Tay and the Wicklow Way makes it relatively accessible compared with some of the range’s more remote summits.
🪨 Geology
The geology of the Wicklow Mountains records hundreds of millions of years of Earth history.
The central mountains are dominated by a huge mass of granite associated with the Leinster Batholith, while mica-schist and still older quartzite occur around its margins.
The geological foundations of the region are linked to the closure of the ancient Iapetus Ocean and the Caledonian Orogeny, a major period of mountain building that affected Ireland, Britain, Scandinavia, Greenland, and other parts of the North Atlantic region roughly 400 million years ago.
Granite was intruded deep within the crust during this tectonic episode. Over immense spans of time, erosion stripped away overlying rocks and exposed the granite at the surface.
Different rock types help explain the contrasting shapes of Wicklow’s mountains. Granite commonly produces broad, rounded summits, while areas underlain by schist can develop sharper ridges and more angular forms.
Glacial shaping
The modern landscape owes much of its appearance to the Ice Ages.
Pleistocene glaciers deepened existing valleys and carved classic U-shaped glens such as Glendalough and Glenmacnass. Smaller mountain glaciers excavated corries that later filled with water.
Other glacial features include moraines, steep valley walls, rocky gorges, and ribbon lakes.
Glendalough’s famous Upper and Lower Lakes are among the clearest examples of the range’s glacial heritage.
đź’§ Rivers, Lakes & Waterfalls
The Wicklow Mountains are an important watershed for eastern Ireland.
Several major rivers originate in or near the mountains, including the:
- River Liffey
- River Dargle
- River Slaney
- River Dodder
- River Vartry
- River Avoca system
Liffey Head Bog, between Kippure, Tonduff, and Djouce, lies near the headwaters of one of Ireland’s most important river systems.
Mountain lakes are another characteristic feature. Glacially formed waters include Lough Tay, Lough Dan, Lough Ouler, Lough Bray Upper and Lower, Cleevaun Lough, and the two lakes at Glendalough.
Streams descending the mountains also create numerous waterfalls. The River Dargle forms the approximately 121-meter Powerscourt Waterfall on the eastern side of the Wicklow uplands.
🌿 Flora & Fauna
Much of the higher Wicklow landscape is covered by blanket bog, wet and dry heath, and upland grassland. Peaty, acidic soils favor plants adapted to wet and nutrient-poor conditions.
Common upland vegetation includes:
- Heather
- Bilberry
- Gorse
- Purple moor grass
- Sphagnum moss
- Bog cotton
- Sundews
Sundews are particularly interesting because they supplement the limited nutrients available in bog soils by trapping insects.
Small areas of native oak woodland survive in valleys including Glendalough and Glenmalure. Downy birch and mixed woodland occur in wetter and lower areas.
Wildlife includes peregrine falcons, merlins, red grouse, skylarks, snipe, pine martens, badgers, foxes, otters, hares, bats, and deer.
The peregrine falcon serves as the symbol of Wicklow Mountains National Park.
Red and introduced sika deer have interbred extensively in the region, producing a substantial population of red-sika hybrids.
🥾 Hiking & Walking Routes
The Wicklow Mountains contain one of Ireland’s finest networks of mountain walks.
Routes range from gentle lakeside paths at Glendalough to lengthy mountain crossings requiring competent navigation.
Wicklow Way
The Wicklow Way is the best-known long-distance walking route through the region. It travels south from the Dublin area through forest, open moorland, mountain passes, valleys, and rural countryside.
It provides an excellent introduction to the landscape without requiring hikers to summit the highest mountains.
Glendalough trails
Glendalough has nine waymarked walking trails, ranging from short woodland walks to strenuous mountain routes.
One of the best known is the Spinc and Glenealo Valley route, a roughly 9.5-kilometer circuit involving rocky trail, boardwalk, forest roads, and elevated viewpoints above the Upper Lake.
The national park also contains portions of several long-distance routes, including the Wicklow Way, St. Kevin’s Way, and the Miner’s Way.
Lugnaquilla
Climbing Lugnaquilla is a much more serious mountain undertaking.
Several approaches are possible, including routes from Glenmalure and the Glen of Imaal. The summit is broad and relatively featureless, making navigation difficult when cloud or fog reduces visibility.
Djouce
Djouce is popular because it combines substantial mountain scenery with relatively convenient access. Walkers can reach the mountain from routes connected with the Wicklow Way and the Lough Tay area.
🏔️ Field Guide Tip: Never underestimate Wicklow because of its comparatively low elevations. Fog can erase landmarks across broad summit plateaus and boggy ridges within minutes. Carry appropriate navigation equipment, waterproof clothing, sturdy footwear, and sufficient food and water, and check current National Park trail notices and weather conditions before leaving.
🌤️ Best Time to Visit
The Wicklow Mountains can be visited throughout the year, although conditions vary considerably.
Late spring
Longer daylight hours and fresh vegetation make late spring an excellent period for walking. Trails can still be very wet after prolonged rain.
Summer
Summer offers the longest days and generally the greatest choice of hiking routes. Heather begins adding color to the uplands later in the season.
Rain, strong winds, and low cloud remain possible even during summer.
Autumn
Autumn can bring beautiful colors to the forests surrounding Glendalough and other valleys. Days shorten rapidly later in the season, making careful time planning increasingly important.
Winter
Winter transforms the mountains into a much more demanding environment. Snow, ice, strong wind, fog, saturated peat, and short daylight hours can significantly increase difficulty.
Experienced walkers can enjoy remarkable winter conditions, but appropriate skills and equipment are essential.
🏛️ Human History & Glendalough
People have occupied the Wicklow uplands since prehistoric times, and archaeological remains include ancient tombs and other monuments.
The most famous cultural site is Glendalough, meaning the “Valley of Two Lakes.”
In the sixth century, St. Kevin established a monastic community in this glaciated valley. Glendalough subsequently developed into an important religious center.
Surviving monuments include a remarkably preserved round tower, medieval stone churches, carved crosses, and other remains associated with the monastic settlement.
The mountains later became important refuges for Gaelic clans and, centuries afterward, for rebels associated with the 1798 Rising.
In response to unrest, the British authorities constructed the Great Military Road between 1801 and 1809. Portions of the historic route still cross the mountains today, passing places such as Sally Gap, Glenmacnass, and Glenmalure.
Mining also left a visible mark on Wicklow. Lead extraction took place in the Glendalough, Glendasan, and Glenmalure valleys, and ruins of former mining settlements can still be seen.
🌲 Wicklow Mountains National Park
Wicklow Mountains National Park protects almost 23,000 hectares of mountain landscape south of Dublin.
Its habitats range from blanket bog and heathland to native woodland, corrie lakes, rocky streams, cliffs, and former mine workings.
Glendalough serves as one of the principal gateways to the park and provides access to both cultural attractions and walking trails.
Visitors should remember that the national park is a protected landscape. Dogs must be kept on leads, fires are prohibited, and visitors are asked to avoid disturbing wildlife or removing plants, rocks, or other natural materials.
🧠Nearby Mountains & Attractions
Glendalough
Few places illustrate the character of Wicklow better than Glendalough. Visitors can combine mountain scenery, glacial geology, woodland, lakeside walks, hiking trails, and one of Ireland’s most significant early Christian sites in a single valley.
Sally Gap and Lough Tay
The high road through Sally Gap crosses an expansive landscape of blanket bog and rounded mountains. Nearby Lough Tay lies below steep slopes and is among the most photographed lakes in the range.
Glenmalure
Glenmalure is one of Wicklow’s great mountain valleys and provides access to the eastern side of Lugnaquilla and surrounding uplands.
Powerscourt Waterfall
On the northeastern side of the mountains, Powerscourt Waterfall plunges approximately 121 meters from the uplands toward the valley below.
Wicklow Gap
The Wicklow Gap provides another scenic east-west crossing through the range, linking the Glendalough area with western County Wicklow.
đź’ˇ Fun Facts
- The Wicklow Mountains form the largest continuous upland area in Ireland.
- Lugnaquilla reaches 925 meters and is the highest mountain in Leinster.
- The mountains extend beyond County Wicklow into Dublin, Carlow, and Wexford.
- The portion extending into Dublin is commonly called the Dublin Mountains.
- Wicklow’s landscape combines rocks formed hundreds of millions of years ago with landforms carved during the comparatively recent Ice Ages.
- Numerous important rivers have their headwaters in the range.
- Glendalough combines an exceptionally clear glacial landscape with a major early medieval monastic complex.
- Wicklow Mountains National Park protects almost 23,000 hectares.
- The historic Military Road still provides one of the most scenic ways to cross the uplands.
- The Wicklow Mountains are included in Mountain Field Guide’s World’s Top 100 Mountain Ranges.
âť“ Frequently Asked Questions
Where are the Wicklow Mountains?
The Wicklow Mountains are in eastern Ireland, primarily within County Wicklow. The range also extends into Counties Dublin, Carlow, and Wexford.
What is the highest mountain in the Wicklow Mountains?
Lugnaquilla is the highest summit at 925 meters (3,035 feet).
Are the Dublin Mountains part of the Wicklow Mountains?
Yes. The northern extension of the range into County Dublin is commonly known locally as the Dublin Mountains.
What are the Wicklow Mountains made of?
Much of the central range consists of granite associated with the Leinster Batholith. Mica-schist, quartzite, and other older rocks occur around its margins.
Were the Wicklow Mountains glaciated?
Yes. Glaciers profoundly reshaped the landscape during the Pleistocene, producing U-shaped valleys, corries, lakes, moraines, and other features.
Is Glendalough in the Wicklow Mountains?
Yes. Glendalough is one of the best-known valleys in the Wicklow Mountains and lies within Wicklow Mountains National Park.
Can beginners hike in the Wicklow Mountains?
Yes. Glendalough and other areas contain short and moderate waymarked trails suitable for recreational walkers. Higher and more remote mountains require stronger navigation, fitness, and mountain-weather awareness.
Is Lugnaquilla difficult to climb?
Lugnaquilla involves non-technical hill walking by normal routes, but poor visibility, boggy ground, exposed terrain, and the broad summit plateau can make navigation challenging.
Why are there so many bogs in the Wicklow Mountains?
High rainfall, acidic soils, poor drainage, and cool upland conditions encouraged peat development. Blanket bog and heath now dominate substantial parts of the range.
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đź“š Sources
- National Parks of Ireland — Wicklow Mountains National Park
- National Parks of Ireland — Nature & Conservation
- National Parks of Ireland — Walking, Hiking & Heritage
- Heritage Ireland — Glendalough Monastic Site and Visitor Centre
- Wicklow Mountains — Wikipedia
