Mont Buet

Mont Buet

Rising to 3,096 meters (10,158 feet) in Haute-Savoie, Mont Buet is one of the most historically important mountains in the French Alps. Although considerably lower than the great 4,000-meter summits of the nearby Mont Blanc massif, Buet played an outsized role in the development of mountaineering, high-altitude science, and early Alpine tourism.

The mountain is sometimes called the “Mont Blanc des Dames,” or “Mont Blanc of the Ladies.” Its broad summit and lingering snowfields can resemble a smaller version of Mont Blanc when viewed from certain directions, but the nickname also became closely associated with the remarkable ascent made by members of the Parminter family in 1786.

Long before climbing mountains became a sport, Mont Buet attracted scientists who wanted to investigate atmospheric pressure, temperature, geology, and the effects of altitude. The successful ascent by the Deluc brothers in 1770 came sixteen years before the first ascent of Mont Blanc and belongs to the earliest recorded scientific mountaineering expeditions in the Alps.

⚡ Fast Facts

Feature	Details
Mountain	Mont Buet
Alternative Name	Mont Blanc des Dames
Country	France
Region	Auvergne-Rhône-Alpes
Department	Haute-Savoie
Mountain Range	Giffre massif, Western Alps
Elevation	10,158 feet / 3,096.1 meters
Prominence	Approximately 2,008 feet / 612 meters
Isolation	Approximately 7.19 miles / 11.57 kilometers
Nearest Higher Neighbor	Aiguille du Génepi
Key Saddle	Col de Tenneverge
Key Saddle Elevation	Approximately 8,149 feet / 2,484 meters
First Recorded Ascent	September 20, 1770
First Ascenders	Jean-André and Guillaume-Antoine Deluc
Historic Vallorcine Route	Vallon de Bérard and Col de Salenton
Principal Hut	Refuge de la Pierre à Bérard
Alternative Approach	Refuge du Grenairon from Sixt-Fer-à-Cheval
Rock Type	Mainly Jurassic argillaceous limestone and shale
Best Known For	Early scientific mountaineering, panoramic Mont Blanc views, and “Mont Blanc des Dames” history

Modern lidar measurements place Mont Buet at approximately 3,096.1 meters, with 612 meters of prominence and 11.57 kilometers of isolation. Its key saddle is the Col de Tenneverge, while Peakbagger identifies Aiguille du Génepi as the nearest higher summit in its database.

🏔️ Where Is Mont Buet?

Mont Buet rises north of the Chamonix Valley in Haute-Savoie, between the Vallorcine area to the southeast and Sixt-Fer-à-Cheval to the west.

The mountain belongs to the Giffre massif, close to the Aiguilles Rouges but geologically distinct from the crystalline granite mountains around Mont Blanc.

Its position is one of its greatest attractions. From the summit, the entire Mont Blanc massif appears across the valley, creating exceptional views toward Mont Blanc, Aiguille Verte, Aiguille du Dru, and many other major Alpine summits.

To the north and west lies the wild terrain of the Haut-Giffre, while the Swiss Alps extend across the horizon beyond the nearby Emosson region.

Summit of Mont Buet in the Giffre massif from Brevent, Haute-Savoie, France. | Santi Rodriguez

🏔️ One of Haute-Savoie’s Highest Mountains

Mont Buet is particularly notable because it is the highest summit in Haute-Savoie outside the Mont Blanc massif.

Although 3,096 meters is modest compared with Mont Blanc’s elevation of more than 4,800 meters, Buet stands well above many surrounding peaks.

Its 612 meters of prominence also gives it considerable topographic independence.

This combination of altitude, isolation, and a broad summit panorama explains why Buet became such an important observation point during the 18th century. Before explorers had successfully climbed Mont Blanc, the summit provided scientists with one of the best available platforms for studying the highest mountains of the Western Alps.

🪨 Geology of Mont Buet

Mont Buet looks very different from the sharp granite aiguilles surrounding Chamonix because it is built from very different rock.

The mountain consists predominantly of alternating Jurassic argillaceous limestones and shales. These sedimentary rocks form broad layered slopes rather than the enormous granite towers characteristic of the Mont Blanc massif.

Geological structures around the mountain belong to the complicated Alpine nappe systems associated with the Giffre region. Folding, thrusting, and tectonic compression have dramatically distorted sedimentary layers that originally accumulated in ancient marine environments.

The southern slopes reveal these tilted and folded layers particularly clearly.

The contrast with the neighboring Aiguilles Rouges is especially striking. Crystalline basement rocks form part of Buet’s southeastern foundation, while younger sedimentary formations dominate the mountain itself.

🔬 A Mountain Laboratory

Mont Buet occupies a special place in the history of science because its earliest climbers were motivated primarily by scientific investigation rather than summit achievement.

Genevan brothers Jean-André and Guillaume-Antoine Deluc first attempted the mountain in 1765.

Their objective was to perform experiments at high altitude, including measuring atmospheric pressure and studying the temperature at which water boiled.

The brothers carried scientific instruments into terrain that had rarely, if ever, been explored by people pursuing systematic high-altitude measurements.

A broken thermometer contributed to the failure of their first expedition. Another attempt also failed before they finally reached the summit in 1770.

Their expeditions transformed Mont Buet into what modern historians have described as a kind of natural laboratory high in the Alps.

📜 The First Ascent in 1770

Jean-André and Guillaume-Antoine Deluc finally reached the summit on September 20, 1770.

Their climb occurred sixteen years before Jacques Balmat and Michel-Gabriel Paccard made the first ascent of Mont Blanc.

The Delucs carried a mercury barometer and thermometers to the summit, where they performed scientific observations designed to better understand altitude and atmospheric conditions.

Jean-André Deluc had developed improved portable barometric equipment, allowing the brothers to use changes in atmospheric pressure to estimate elevation.

At a time when the upper Alps remained poorly mapped and largely unexplored, the expedition combined exploration, physical endurance, and experimental science in a way that anticipated later mountaineering expeditions.

🌡️ Boiling Water on a Mountain

One of the Deluc brothers’ most interesting experiments involved the boiling point of water.

Atmospheric pressure decreases with elevation. Because lower pressure allows water to boil at a lower temperature, measuring boiling temperature provided scientists with another way to investigate altitude and atmospheric conditions.

This relationship was understood imperfectly during the 18th century, making high mountains extremely valuable natural laboratories.

Carrying delicate thermometers, mercury barometers, and other equipment to more than 3,000 meters was itself a considerable challenge.

The expedition therefore helped establish the idea that mountains could be important scientific environments rather than merely dangerous obstacles.

Mont Buet near Chamonix in the French Alps is used as a training climb for Mont Blanc. It is often called ‘Mont Blanc Des Dames’

🧭 Marc-Théodore Bourrit Finds a New Route

In 1775, Genevan artist, writer, musician, and mountain enthusiast Marc-Théodore Bourrit reached Mont Buet by a new approach from the Vallorcine side.

His route passed through the Vallon de Bérard, broadly establishing the approach that remains one of the principal ways to climb the mountain today.

Bourrit played an important role in popularizing Alpine scenery among European readers.

His writings and illustrations helped transform public perceptions of mountains. Landscapes once described mainly as frightening, barren, or useless increasingly became objects of scientific curiosity and aesthetic admiration.

His ascent also made Mont Buet more accessible to visitors arriving from the Chamonix and Vallorcine side.

🔭 Horace-Bénédict de Saussure on Mont Buet

The following year, Horace-Bénédict de Saussure climbed Mont Buet.

Saussure was one of the central figures in the early exploration of the Western Alps and would later become closely connected with efforts to reach Mont Blanc.

From Buet, he could study the great snowy mountain across the valley and make scientific observations at high altitude.

Mont Buet therefore became part of the broader story leading toward the eventual first ascent of Mont Blanc in 1786.

The progression is significant. Before scientists and guides could seriously contemplate reaching the highest summit in the Alps, mountains such as Buet allowed them to develop practical knowledge about altitude, glaciers, equipment, weather, and prolonged travel in high terrain.

👩 The “Mont Blanc des Dames”

Mont Buet is widely known as the Mont Blanc des Dames.

The nickname has sometimes been interpreted simply as implying that Buet was an easier, smaller version of Mont Blanc. Its historical associations, however, are much more interesting.

In August 1786, the Parminter women from Devon in England made a remarkable expedition onto Mont Buet during their European Grand Tour.

Contemporary accounts record members of the Parminter party reaching the high mountain with local guides only weeks after the first ascent of Mont Blanc.

Their journey became one of the earliest documented examples of women participating in high-altitude Alpine mountaineering. The National Trust preserves the story as part of the history of Jane and Mary Parminter and their travels through Europe.

👩‍🦯 The Parminter Expedition

Historical sources differ slightly over exactly which members of the Parminter party stood on the highest point, but Jane, Mary, and Elizabeth Parminter were associated with the 1786 ascent.

A contemporary account by Bourrit described three English women making the climb through deep snow with guides.

The achievement was extraordinary for its time.

Organized recreational mountaineering barely existed, and social expectations placed substantial restrictions on women’s physical activities and independent travel.

The fact that English women were undertaking a difficult 3,000-meter Alpine expedition in the same summer that Mont Blanc itself was first climbed demonstrates how quickly the mountains were becoming part of Europe’s emerging culture of exploration.

🥾 The Normal Route Through Vallon de Bérard

The most familiar summer ascent begins near the hamlet of Le Buet, close to Vallorcine.

From the railway stop, hikers enter the beautiful Vallon de Bérard and follow the valley toward Refuge de la Pierre à Bérard.

The lower approach passes forests, waterfalls, streams, meadows, and huge boulders before reaching increasingly open Alpine terrain.

The Swiss Alpine Club grades the approach from Le Buet to the refuge around T2, with approximately 600 meters of ascent and roughly two hours of walking.

Beyond the refuge, the route becomes considerably longer and more demanding as it continues toward the Col de Salenton and the upper slopes of Mont Buet.

🛖 Refuge de la Pierre à Bérard

Refuge de la Pierre à Bérard stands at approximately 1,924 meters in the Vallon de Bérard.

The refuge takes its name from the enormous rock against which the building is constructed. The boulder helps shelter the structure within an environment exposed to significant winter snow and avalanche activity.

For hikers climbing Mont Buet, the refuge allows the ascent to be divided into two more manageable days.

It is also a worthwhile hiking destination in its own right.

The surrounding Vallon de Bérard belongs to a protected natural landscape and provides a striking transition from forests and rushing streams to the rocky high country beneath Buet.

🌲 Vallon de Bérard Nature Reserve

The Vallon de Bérard National Nature Reserve was created in 1992 and protects more than 539 hectares within the commune of Vallorcine.

Interestingly, the traditional hiking path from Le Buet toward Mont Buet via the Col de Salenton was specifically excluded from the reserve’s formal boundaries when the protected area was created.

The valley itself nevertheless contains valuable Alpine habitats.

Visitors pass through forests, meadows, rocky slopes, streams, avalanche corridors, and high-altitude vegetation zones while approaching the mountain.

The reserve illustrates how dramatically ecosystems can change over less than 2,000 vertical meters in the Alps.

🥾 The Col de Salenton

Above Refuge de la Pierre à Bérard, the route continues through increasingly barren terrain toward the Col de Salenton.

This pass forms an important gateway into the upper mountain.

The landscape becomes progressively more austere as vegetation gives way to broken rock, shale, scree, and lingering snowfields.

From the col region, hikers turn toward the broad upper slopes of Mont Buet.

Although the standard route is often treated as a hiking ascent in favorable late-summer conditions, its length, altitude, loose terrain, exposure, and possible snow make it a substantial mountain day.

Conditions can change the character of the ascent considerably.

🥾 The Sixt-Fer-à-Cheval Route

Mont Buet can also be approached from Sixt-Fer-à-Cheval on its western side.

One important route uses Refuge du Grenairon, standing above Salvagny.

From the refuge, hikers cross rugged slopes and the Frêtes du Grenier, with impressive views toward the Cirque des Fonts and the western side of Buet.

The route continues toward the Plan du Buet before gaining higher terrain.

This approach offers a very different experience from Vallon de Bérard. It is longer and more remote in character, passing through the dramatic limestone landscapes for which the Haut-Giffre is famous.

🛖 Refuge du Grenairon

The Refuge du Grenairon stands at roughly 1,974 meters above Sixt-Fer-à-Cheval.

A refuge was first constructed here in 1910, establishing a high base for climbers and hikers approaching Mont Buet from the west.

The building was destroyed by fire in 1984 and subsequently reconstructed.

Today, Grenairon remains an important stop for multi-day hikes and ascents of Mont Buet.

The setting offers excellent views over the Haut-Giffre, including the Cirque des Fonts and the surrounding limestone mountains.

🏔️ The North Ridge and Traverses

Experienced mountain hikers can combine Mont Buet with more ambitious ridge traverses.

The north ridge provides an alternative to simply returning by the normal Bérard route. Some sections are considerably more exposed and may contain fixed cables or chains.

Routes can also connect toward Cheval Blanc, the Emosson region, or the Sixt side of the mountain.

These alternatives create excellent traverses but require stronger route-finding skills and confidence on exposed mountain terrain.

They should not be treated as equivalent to the standard Vallon de Bérard ascent.

❄️ Snow on Mont Buet

Mont Buet historically carried substantial snowfields, contributing to its resemblance to a miniature Mont Blanc.

Snow can still persist well into summer, particularly in gullies and on shaded upper slopes.

Early-season hikers may encounter extensive hard snow requiring equipment and skills beyond ordinary trail walking.

A slope that becomes straightforward scree in late summer can be considerably more serious when covered with firm snow or ice.

The mountain’s broad shape can also make navigation difficult in cloud, particularly when snow obscures trails and cairns.

🎿 Ski Mountaineering

Mont Buet is also a well-known ski-mountaineering objective.

The Vallon de Bérard provides access to broad snowy terrain beneath the summit, and winter or spring ascents allow ski tourers to experience the mountain in conditions that more closely resemble its historic snow-covered appearance.

The summit’s substantial elevation gain creates a long ski tour.

Avalanche conditions, snow stability, weather, route-finding, and equipment must all be carefully considered.

Unlike a summer hiking ascent, a winter climb involves genuine avalanche terrain and should be approached with appropriate training and experience.

🔭 One of the Great Mont Blanc Viewpoints

Few summits outside the Mont Blanc massif provide a better overall perspective of its mountains.

From Buet, the great chain rises across the Chamonix Valley almost like an enormous natural relief map.

Mont Blanc dominates the skyline, while Aiguille Verte and the Aiguille du Dru stand prominently among the northern aiguilles.

Farther south, the complex high summit region around Aiguille du Midi, Mont Blanc du Tacul, and Mont Maudit can be identified in clear conditions.

This panorama was one of the reasons Buet became so important to early scientists attempting to understand the geography of Mont Blanc.

🌿 Flora and Fauna

The lower slopes around Mont Buet contain rich Alpine habitats.

Forested terrain near Vallorcine gives way to subalpine meadows where grasses and flowering plants thrive during the short summer season. The Bérard area is particularly attractive during early summer, when Alpine vegetation is at its most colorful.

At higher elevations, plant communities become progressively smaller and more specialized. Saxifrages, gentians, alpine grasses, and other cold-adapted plants may occupy sheltered locations before vegetation eventually disappears among scree and exposed rock.

The wider protected landscapes around Buet support animals typical of the northern French Alps, including Alpine ibex, chamois, marmots, mountain hares, golden eagles, bearded vultures, Alpine choughs, and rock ptarmigan.

Wildlife is considerably easier to encounter away from the busy summit trail and during quieter periods of the day.

🌡️ A Mountain Changing with the Climate

Mont Buet is not as heavily glaciated as the high Mont Blanc massif, but changing snow patterns are still altering its character.

Persistent snowfields have diminished over time, and the duration of seasonal snow cover varies substantially from year to year.

These changes affect hiking conditions as well as the mountain’s appearance.

Earlier snowmelt can expose loose shale and scree sooner in the season, while periods of extreme heat can make long summit days physically demanding.

Conversely, late spring or early summer snow can transform the upper route into terrain requiring ice axes, crampons, and mountaineering judgment.

Checking current conditions before starting is therefore essential.

View at Mont Buet from Le Buet village.The Mont Buet is a mountain in the Giffre Massif in Haute-Savoie, France | Marian Makapix

⚠️ Hazards and Safety

Mont Buet is sometimes described as an accessible 3,000-meter summit, but accessible does not mean easy.

An ascent from Le Buet involves an enormous elevation gain if completed in a single day. Even when divided with a night at Refuge de la Pierre à Bérard, summit day remains long.

Loose rock, scree, snowfields, steep slopes, exposure, thunderstorms, sudden fog, strong winds, and cold temperatures are important hazards.

Altitude can also affect hikers who are accustomed only to lower elevations.

Early or late in the season, snow and ice may require mountaineering equipment. In poor visibility, the broad upper mountain can become difficult to navigate.

Hikers should obtain recent information about trail and snow conditions before attempting the summit.

👀 Where to See Mont Buet

Mont Buet is visible from numerous locations around Vallorcine and the northern Chamonix Valley.

The village of Vallorcine provides convenient access to the mountain and its surrounding valleys.

Higher viewpoints around the Aiguilles Rouges provide particularly good perspectives of Buet’s broad profile.

The Aiguillette des Posettes is another useful viewpoint, with panoramas extending toward Mont Buet as well as the Mont Blanc massif.

From the summit itself, the perspective reverses dramatically: the mountains of Chamonix dominate the southern skyline, explaining why generations of scientists and hikers have valued Buet as a natural observation platform.

🏔️ Nearby Mountains

Mont Buet occupies a fascinating position between several major Alpine landscapes.

Immediately southeast lie the Aiguilles Rouges, separated from Buet’s sedimentary terrain by deep Alpine valleys.

Across the Chamonix Valley rises Aiguille Verte, with Aiguille du Dru below its western side.

Farther south, Aiguille du Midi, Mont Blanc du Tacul, Mont Maudit, and Mont Blanc form the towering central skyline.

To the north lie Cheval Blanc, the Emosson region, and peaks extending toward Switzerland.

This location gives Mont Buet one of the broadest and most varied panoramas in Haute-Savoie.

🌄 Why Mont Buet Is Special

Mont Buet does not possess the sheer granite walls of Grandes Jorasses, the sharp snow ridge of Aiguille de Bionnassay, or the extraordinary height of Mont Blanc.

Its importance comes from something different.

Mont Buet stands close to the beginning of modern Alpine exploration.

Jean-André and Guillaume-Antoine Deluc came here in the 18th century carrying scientific instruments rather than climbing equipment. They wanted to measure atmospheric pressure, test theories about boiling water, and better understand the physical world.

Marc-Théodore Bourrit followed, opening a new approach and describing the mountains to a growing European audience. Horace-Bénédict de Saussure climbed Buet while investigating the route toward an even greater goal: Mont Blanc.

Then came the Parminter women, whose 1786 expedition became an important early chapter in women’s Alpine mountaineering.

More than 250 years later, hikers continue to follow many of the same valleys toward the broad summit.

The instruments, trails, and equipment have changed enormously, but the reward remains much the same: one of the finest views of Mont Blanc and the surrounding Alps, from a mountain that helped teach Europeans why high summits were worth climbing in the first place.

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