Chamonix Trail Running
Altitude training ground for serious trail runners
Chamonix isn't just where the best trail runners in the world converge every August — it's where the standard for what trail running means was set. The trails are serious, the altitude is real, and the community that forms here every summer is unlike anything else in the sport. Whether you're building a UTMB block or running for the first time above 2,000m, this is the place.
Events
UTMB entries open — groups forming around race week
Availability
Altitude camps booking fast for June–July
Conditions
Trail conditions excellent above 1800m from mid-June
Accommodation
Trail-base stays
From high-altitude refuges to fully serviced chalets with physio — every property here is chosen with the runner's daily routine in mind.
Refuge des Bossons
Les Houches
Chalet Argentière
Argentière
Mont Blanc Lodge
Chamonix centre
Argentière Altitude Base
Argentière, 1252m
Planning
Best time to go
Peak window
June – September
Weather
Snow clears by late May at lower elevations. High alpine trails open mid-June.
Training relevance
June altitude blocks build aerobic base. August race season brings the biggest groups.
Active trips
Trips forming now for Chamonix
People are there right now
@jessruns
Argentière, Chamonix
Trail conditions above 1800m are exceptional. Already planning to come back in August.
@marcoalpine
Chamonix, France
Altitude run this morning. 2400m. Lungs on fire. Worth every step.
@dankimber
Chamonix valley
Three days before the UTMB. Legs good, head ready. The valley is electric right now.
@alexrides
Les Houches, Chamonix
Tried trail running for the first time up here. Predictably addicted.
Groups here now
Ready to go to
Chamonix?
Tell us how you move and we'll find your people, your stay and your trip — exactly when they're available.