What’s Happening in Chamonix This August: UTMB Week & More

Chamonix is set to come alive this August with a series of exhilarating events, culminating in the prestigious Ultra-Trail du Mont-Blanc (UTMB) week. Whether you’re a runner, a spectator, or someone who enjoys the vibrant atmosphere of mountain festivals, there’s something for everyone.

🏔️ Ultra-Trail du Mont-Blanc (UTMB) Week: August 25–31

Dates: August 25–31, 2025
Location: Chamonix Valley, France, Italy & Switzerland

The UTMB Week is the pinnacle of trail running, attracting elite athletes and enthusiasts from around the world. The main event, the UTMB, is a grueling 174 km race with over 9,900 meters of elevation gain, starting on Friday, August 29 at 17:45 from Chamonix’s Place du Triangle de l’Amitié. The course has been slightly modified near Les Houches for safety while preserving the classic route.

In addition to the UTMB, several other races are part of the week:

PTL (Petite Trotte à Léon): 300 km, 25,000 m+

TDS (Sur les Traces des Ducs de Savoie): 148 km, 9,300 m+

CCC (Courmayeur-Champex-Chamonix): 101 km, 6,050 m+

OCC (Orsières-Champex-Chamonix): 57 km, 3,500 m+

MCC (Martigny-Combe-Chamonix): 40 km, 2,350 m+

YCC (Youth Chamonix Courmayeur): Various distances for juniors and cadets

Beyond the races, the week features:

Ultra-Trail Village: Open daily from 09:00 to 18:00 at Place du Mont-Blanc

Fan Experience: Interactive zones for spectators, open from 10:00 to 22:00

Mini UTMB Events: Shorter races for all ages and abilities

For a detailed schedule and more information, visit the official UTMB website.

🏃 Argentrail: A Local Favorite

Date: July 20, 2025
Location: Argentière, Chamonix Valley

While not part of the UTMB Week, Argentrail is a cherished local race that offers a unique alpine experience. The main race covers 27 km with 1,700 m+ elevation gain, starting from the center of Argentière. It follows a double loop through the villages of Le Lavancher and Peclerey, providing stunning views of Mont Blanc and the surrounding peaks.

For those seeking a shorter challenge, there’s also a 14 km option. The race is semi-autonomous, requiring participants to be self-sufficient with their gear and nutrition. It’s a perfect blend of community spirit and alpine adventure.

🎉 Other Events in Chamonix This August

Trail Running Expo: August 25–31 at Place du Mont-Blanc

Mountain Film Festival: August 26–28 at the Chamonix Cinema

Live Music & Food Stalls: Throughout the week at various locations in Chamonix

🗺️ Spectator Tips

If you’re planning to watch the races, here are some prime spots:

UTMB Start/Finish: Place du Triangle de l’Amitié, Chamonix

OCC Finish: Place du Mont-Blanc, Chamonix

TDS & CCC: Various points along the trails; check the official UTMB website for detailed maps

For real-time updates and live tracking of runners, download the UTMB app or visit the official website.

Chamonix in August is a celebration of endurance, community, and the breathtaking beauty of the Alps. Whether you’re participating in a race or cheering from the sidelines, it’s an experience not to be missed.

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