Why Mont Blanc is famous
Mont Blanc is the highest point of the Alps, of Western Europe and of the European Union. If the Caucasus is counted as part of Europe, Elbrus (5,642 m) and four other Caucasian peaks are higher, which is why the "highest in Europe" title is disputed; in the Alps nothing comes close. With a prominence of 4,696 m it ranks 11th in the world and second in Europe after Elbrus. The northern side drops 3,800 m to the Chamonix valley, one of the largest continuous height differences in the Alps.
The mountain also stands at the start of mountaineering as a sport. The Genevan naturalist Horace-Bénédict de Saussure offered a reward for the first ascent in 1760, and the success of Balmat and Paccard in 1786 opened the age of alpine climbing. Today the summit area is a protected classified site, and Chamonix, which hosted the first Winter Olympics in 1924, received around 100,000 visitors a day in summer at the start of this century.
The changing height
For more than a century maps gave 4,807 m, a value close to the 4,807.20 m levelled by Henri and Joseph Vallot in 1892–1894. Since 2001 surveyors from the Haute-Savoie chamber of chartered surveyors, with guides from Chamonix and Saint-Gervais, have measured the summit every two years. Results ranged from 4,810.90 m in 2007 to 4,805.59 m on 15 September 2023, the lowest so far, recorded after a long drought. In 2025 a Franco-Italian study by the Fondazione Montagna Sicura of Courmayeur and the Université Savoie Mont Blanc, using drones and ground radar, put the summit at 4,807.3 m and the ice under it at about 20–25 m thick.
The rock summit lies at about 4,792 m and slightly west of the snow top. Wind sculpts the summit ridge like a dune: in calm, snowy years it grows, in windy or dry years it shrinks, and the highest point wanders; between 2003 and 2009 it moved 34 m to the east.
The border dispute
France and Italy have never agreed where the border runs on the summit. The 1860 Treaty of Turin, which gave Savoy to France, and its 1861 demarcation map draw the line across the summit cap. From 1865, however, French maps, starting with the staff map of Captain Jean-Joseph Mieulet, show a triangle of French territory pointing south, which places the summit entirely in France with the border on Mont Blanc de Courmayeur (4,748 m). Italian maps keep the line on the top. A French prefectoral order of 1946 divided the disputed sector between Saint-Gervais, Les Houches and Chamonix. Italy formally restated its position in 1995, and a joint commission's discussion in 2021 went nowhere; the disputed area on Mont Blanc covers about 65 hectares, with a second one on the Dôme du Goûter.
Where it is and how to get there
Three towns surround the mountain: Chamonix and Saint-Gervais-les-Bains in France and Courmayeur in Italy. The nearest major airport is Geneva. The 11.6 km Mont Blanc Tunnel, opened in 1965, links Chamonix and Courmayeur under the massif.
For the normal route, the Tramway du Mont-Blanc, France's highest railway, climbs from Le Fayet (581 m) via Saint-Gervais and the Col de Voza; you can also join it at Bellevue by cable car from Les Houches. For more than a century it stopped at a provisional terminus at the Nid d'Aigle (2,372 m); on 27 June 2026 a 280 m extension to a new station at 2,412 m, beside the Nid d'Aigle hut, opened to the public. In Chamonix the Aiguille du Midi cable car, opened in 1955, rises in two stages from 1,038 m to 3,777 m, with a lift to the top terrace at 3,842 m. From there the Vallée Blanche gondola crosses the glaciers to Pointe Helbronner, where the Skyway Monte Bianco (2015, rotating cabins) descends to Courmayeur.
The Goûter route (normal route)
The Goûter route, also called the Voie des Cristalliers or Voie Royale, is graded PD and carries most of the traffic. It was first climbed in its modern form, over the Arête des Bosses, on 18 July 1861 by Leslie Stephen and Francis Fox Tuckett with the guides Melchior Anderegg, Johann Joseph Bennen and Peter Perren.
- Day 1. From the Nid d'Aigle a path climbs through scree and rock to the Tête Rousse hut (3,167 m). Above it the route crosses the Grand Couloir at about 3,340 m and climbs the rocky rib beyond it, equipped with cables, to the Goûter hut (3,835 m) on the Aiguille du Goûter. La Chamoniarde gives +1,428 m and 5–6 hours from the Nid d'Aigle.
- Day 2. Breakfast is served at 2 a.m. The route continues on snow over the Dôme du Goûter (4,304 m), past the emergency Vallot shelter (4,362 m) and along the narrow Arête des Bosses to the summit: +1,015 m, then 2,438 m of descent back to the tram, 10–12 hours in total.
Splitting the climb at Tête Rousse means a shorter first day (+800 m) and an early crossing of the couloir while it is still frozen, but a long second day of about +1,650 m. On any route you meet slopes of around 40° that may be hard ice; you need crampon technique, roped glacier travel and crevasse rescue skills, plus prior acclimatisation, typically several nights above 2,500–3,000 m.
Other routes
- Trois Monts (PD, more demanding). From the Aiguille du Midi you walk down to the Cosmiques hut (3,613 m), then climb over the shoulders of Mont Blanc du Tacul and Mont Maudit, past bergschrunds and the steep Mur de la Côte, to the summit: about +1,425 m, then back over the same ground with 370 m of re-ascent to the cable car, 13–14 hours. Serac falls and avalanches threaten the Tacul and Maudit slopes.
- Grands Mulets (PD). The route of the first ascent, from the Plan de l'Aiguille via the Grands Mulets hut (3,051 m). The glacier is now so broken that it is used mostly as a spring ski route and in descent.
- Italian normal route (PD). From the Combal car park in Val Veny it climbs 1,371 m over the Miage Glacier to the Gonella hut (3,071 m), then crosses the Col des Aiguilles Grises to the Dôme du Goûter and joins the Bosses ridge: +1,739 m to the summit and over 3,100 m down. There are no lifts, the glacier can be chaotic and the route is much quieter.
- Harder lines include the Miage–Bionnassay traverse (AD, three days), the Innominata ridge (D+) and the Peuterey ridge, one of the hardest ways to the top.
Tour du Mont Blanc and visits without climbing
The Tour du Mont Blanc (TMB) is a waymarked loop of about 168 km through France, Italy and Switzerland, with roughly 10 km of total ascent. Most people walk it anticlockwise from Les Houches in 8–10 days of about six hours, sleeping in huts, gîtes and hotels; the highest points, the Col des Fours and the Fenêtre d'Arpette, are at 2,665 m. Huts open from mid-June to mid-September; snow can linger on passes into early July, and from 14 July to 15 August the trail and huts are crowded. The Ultra-Trail du Mont-Blanc races round the same loop each late August.
Without climbing, the Aiguille du Midi terrace at 3,842 m, the Skyway's Pointe Helbronner (3,466 m) and the tram ride to the Nid d'Aigle give close views of the summit. Remember that the Aiguille du Midi takes you from 1,000 m to almost 3,800 m in about 20 minutes.
Rules, bookings and costs
Since 2020 a prefectoral order for the protection of natural habitats (APHN) covers the normal route. It makes booking the huts compulsory and bans bivouac along the whole route from the Col du Mont Lachat to the summit, and gendarmes carry out checks. The whole Mont Blanc classified site is closed to camping; under the environment code, breaking that ban carries up to two years in prison and a €300,000 fine. The Vallot shelter is for emergencies only and may not be used as accommodation.
Nid d'Aigle, Tête Rousse and Goûter are booked through a single FFCAM system: you give the names, dates of birth and nationality of all climbers and upload an ID, a group can book at most 12 places, and the confirmation document must be shown with ID at any check and at the hut. Reservations lapse at 5 p.m. if you do not arrive. Prices for 2026: Goûter €70 a night for adults (€65 for alpine club members, €50 for guides), breakfast €21 and dinner €52.20; Tête Rousse €60, dinner €46.20; a sleeping-bag liner is mandatory (€10 at the hut). In 2026 the huts were staffed from 29–30 May to 3–4 October. The Italian side has no comparable permit system; the Gonella hut is staffed from June to September.
Hiring an IFMGA mountain guide is not compulsory but raises the chances of success considerably; about half of the Goûter hut's guests climb with one.
When to go and weather
The normal season follows the staffed period of the huts, from late May or June to September. The summit cap is permanently frozen: the average temperature at the top is about −15 °C, and −43 °C was recorded in January 1893. Wind around the Goûter hut can reach 230 km/h. Chamonix receives about 1,020 mm of precipitation a year, the Col du Midi at 3,500 m about 3,100 mm. Hot summers make the Grand Couloir far more dangerous: in August 2026, during a heatwave, the mayor of Saint-Gervais closed the Tête Rousse and Goûter huts and reopened them only on 26 August, while La Chamoniarde reported the Trois Monts and the Italian route out of condition.
Water
Above the tram there is no water you can count on: the route runs over scree, rock, snow and ice. Carry about 1.5–2 litres for each day and drink regularly; dehydration adds to altitude sickness. The huts sell drinks and meals, but water at the Goûter is produced by melting snow in a plant with eight 3,000-litre tanks behind the building, and the huts have no running water in the toilets and no showers. Water use and waste on the route were one of the reasons for the 2020 regulations, so take your rubbish down. If you melt snow or take meltwater lower down, boil or treat it.
Mobile coverage and emergencies
The French and Italian valleys have good networks, and on the open upper slopes facing Chamonix or Saint-Gervais a phone often finds a signal, but do not rely on it in couloirs, behind ridges or on the remote Italian glacier side; keep the phone warm and charged. Call 112 in both countries. The Chamonix mountain rescue (PGHM) answers on +33 4 50 53 16 89. Huts have emergency beacons, and a VHF radio on 150 MHz can be used where phones fail. For current conditions, ask the hut wardens or La Chamoniarde in Chamonix.
Dangers and safety
Between 1990 and 2011, 74 people died on the stretch between Tête Rousse and the Goûter hut, according to a PGHM and Petzl Foundation study. About half of the accidents happen on the 100 m traverse of the Grand Couloir and a third on the ridge above; most are falls, often caused by stones, two thirds of the victims were not roped, and accidents are as frequent on the descent. Rockfall peaks between 11 a.m. and 1:30 p.m. on warm, dry days, so cross early, wear a helmet and do not linger. In recent decades 10 to 20 climbers have died on the mountain each year (14 in 2017), and the rescue services carry out 80–100 interventions a year, most of them for exhaustion from poor fitness or lack of acclimatisation. On busy summer days 350–400 people set out on the different routes, and between 40 and 100% of them turn back, depending on the day.
History and name
Early maps called it the Montagne Maudite, the cursed mountain; "Mont Blanc", the white mountain, came into use in the late 17th century. After Saussure's reward, attempts began in 1775. On 7 August 1786 Balmat, a crystal hunter, and Paccard, the Chamonix doctor, set out from Les Bossons, followed the Grands Mulets line and reached the summit at 6:23 p.m. the next day. Paccard came down snow-blind, and Balmat learned that his daughter had died on the day of the ascent. Later accounts played down Paccard's role; his monument in Chamonix dates only from 1986. Saussure himself reached the top on 3 August 1787 with a party of 19. The first woman on the summit was Marie Paradis of Chamonix on 14 July 1808, who admitted being "dragged, pulled and carried"; Henriette d'Angeville made the second female ascent in 1838 under her own power. The first fatal accident came in 1820, when three guides were swept away by an avalanche; their remains emerged from the glacier in 1861.
Interesting facts
- The astronomer Pierre Janssen built an observatory on the summit ice in 1893 after Gustave Eiffel's surveyors failed to find rock 12 m below the snow; the building tilted and was abandoned when a crevasse opened beneath it.
- Two Air India airliners crashed into the mountain on approach to Geneva, in 1950 and 1966; the second carried the nuclear physicist Homi Bhabha.
- Henri Giraud landed a plane on the summit on 23 June 1960.
- Kílian Jornet ran from Chamonix to the summit and back in 4 hours 57 minutes on 11 July 2013.
- The Goûter hut, opened in 2013, is an egg-shaped stainless-steel building for 120 people, partly suspended over a 700 m drop.
FAQ
How high is Mont Blanc? The traditional figure is 4,807 m. The official biennial survey measured 4,805.59 m in September 2023, and a 2025 Franco-Italian study gave 4,807.3 m; the height changes with the ice cap.
How long does it take to climb Mont Blanc? Usually two days on the Goûter route: 5–6 hours to the Goûter hut, then 10–12 hours to the summit and back to the tram. Add several days of acclimatisation before.
How difficult is it? The normal routes are graded PD: technically modest but long, at high altitude, with 40° slopes, crevasses, a narrow ridge and rockfall in the Grand Couloir.
Do I need a permit or a guide? There is no climbing permit, but on the Goûter route you must have a named hut booking, carry the confirmation and ID, and not camp. A guide is optional but improves the odds.
How much does it cost? In 2026 a night at the Goûter hut costs €70 for adults, plus €21 for breakfast and €52.20 for dinner; Tête Rousse costs €60. Add the tram or cable cars and, if you hire one, a guide.
Is there water on the route? Not reliably. Carry 1.5–2 litres a day; the huts sell drinks, and the Goûter makes its water from melted snow.
Is there mobile coverage on Mont Blanc? Often on the open upper slopes facing the French valleys, but not everywhere, especially in couloirs and on the Italian side. Emergency number: 112.
When is the best time to climb Mont Blanc? From June to September, when the huts are staffed; in heatwaves rockfall in the Grand Couloir increases sharply and the huts may be closed.
Is the summit in France or Italy? Both claim it. French maps place the summit wholly in France, Italian maps put the border on the top, and the question has never been settled.