Skip to main content
  • Website
  • Dates
  • Photos
  • Map

Marathon du Mont-Blanc, Chamonix

Trail running & marathon competitions 10km to 90km

Featured in: | Updated

If you’re a fan of trail running then the Marathon du Mont Blanc is the ultimate challenge. Covering 42km and climbing over 2,000 metres, this high-altitude race is for the super-fit.

An annual event, the Chamonix marathon takes place every June and attracts thousands of competitors and spectators. There are a number of extra events held throughout the weekend, enabling everyone to get involved in the Marathon du Mont Blanc.

More information and registration via the website linked above.


Place du Mont Blanc and throughout the mountains.

What to see

For those who would rather cheer from the sidelines there is plenty to keep you occupied whilst the runners are slogging it out. Giant screens are erected with live feeds to different points of the race, so you can keep an eye on the action from Chamonix. Many people hike up to Flégère or Plan Praz (you can take advantage of the lift system if you prefer) to cheer on the competitors as they reach the final stages of their race. The villages along the route often have a good turn-out of spectators, so the runners enjoy plenty of support and there is a good atmosphere throughout the valley. Entertainments such as climbing walls, bungee trampolines and live music add to the fun and the weekend culminates in the prize giving ceremony at Place du Triangle de l’Amitié (the space in front of the Tourist Office).

There is usually a celebratory buffet meal or ‘Pasta Party’ after the Cross and the Marathon races, giving competitors the chance to meet, chat and congratulate each other on their achievement.

Every year hundreds of volunteers are involved in the organisation of this event. If you would like to volunteer and support the event, visit the website or use the enquiry form the find out more.


In 2013, the Marathon became an official race on the ISF (International Skyrunning Foundation) calendar of international events - Skyrunner Trail Series.

Facts & figures

The Marathon starts early in the morning at the Place du Triangle de l’Amitié. Limited to 2,000 competitors, the runners line up to take on the challenge of running from Chamonix to Argentière to Plan Praz (the Brévent mid-station).

From the centre of Chamonix (altitude 1035m) the runners set off along the river Arve, passing through the hamlets of Les Bois and Lavancher. It is a steady climb for about 15km until they reach Argentière at 1,250m. The route then crosses the Col des Montets (1,461m) in the heart of the Aiguilles Rouges nature reserve. Following the Chémin des Diligences, the old stage-coach route, the course arrives at the hamlet of Le Buet before reaching Vallorcine (1,260m), a quiet village nestled at the bottom of the valley, just on the edge of the Swiss border.

The runners then climb up to the Col des Posettes at 1,997m where (if they can still see straight!) they can take in splendid views over the Mont Blanc massif, opposite the Aiguille and the Tour glacier. The route then gradually descends across the mountain passes to reach Charamillon at 1,850m. A steady incline takes the runners up to the village of Le Tour (1,453 m) before flattening out along the road leading to Montroc (1,382 m).

After passing through the hamlets of Frasserands and Tré-le-Champ the route returns back onto the historic route of the Mont Blanc cross-country race. At the heart of the Aiguilles Rouges massif, opposite the Mont Blanc range, the route ascends until La Flégère (1,875m) after crossing the magnificent Charlanon Coomb (1,812m). A gentle yet progressively steeper climb makes up the final stretch, bringing the runners to the finish at Plan Praz (2,050 m), which offers further spectacular beautiful views of Mont Blanc.

The beginning of the race, from Chamonix to Lavancher is mostly in the shade, however, much of the race (especially the final stretch from La Flégère to Plan Praz) is under the full glare of the summer sun. This race is much more gruelling than your average marathon; not only is much of it over cross-country trails and up steep ascents but Chamonix itself is almost as high as Mount Snowdon – so before the runners even set off they are struggling with racing at high altitude! This is evident in the race times; the average Marathon du Mont Blanc winner usually completes the course in around four to four and a half hours. If you compare this with the more well-known London and New York marathons, where the average winning time is usually just over two hours, you can see a clear difference.


Registration for the Marathon opens typically in October each year. Registration is via a ballot system and is exclusively online.

Dates for this event

June 2022





More Chamonix Insights...