UTMB Mont-Blanc

The Ultra-Trail du Mont-Blanc is more than a race — it is a living legend of trail running. Every year in late August, nearly 2,300 runners from around the world gather in Chamonix to embark on a 171-kilometer journey around the Mont-Blanc massif. The course crosses three countries — France, Italy, and Switzerland — with a cumulative elevation gain of 10,000 meters, making it one of the most demanding endurance events on Earth.

The route follows legendary trails: the nighttime climb to Col du Bonhomme, the vertiginous descent into Courmayeur on the Italian side, the Swiss Val Ferret bathed in alpine light, and the return via Tete aux Vents with Mont-Blanc as a backdrop. The highest point reaches 2,537 meters, but it is the relentless accumulation of passes and valleys that makes the race so formidable. Weather conditions can shift in minutes: crushing heat in the valleys, possible snow on the ridges, violent storms at altitude.

The UTMB is part of the UTMB Mont-Blanc event which offers five races to suit all levels. The CCC (101 km, 6,100 m D+) follows the second half of the route from Courmayeur to Chamonix. The TDS (149 km, 9,100 m D+) takes wild trails on the southern side of the massif. The OCC (56 km, 3,500 m D+) provides an accessible entry into alpine ultra-trail running. The MCC (40 km) and YCC (15 km) allow beginners and young runners to experience the unique atmosphere of UTMB week.

To qualify for the UTMB, runners must accumulate Running Stones from qualifying races. An ITRA performance index of 600 or higher is recommended to have a realistic chance of finishing within the 46h30 time limit. Ideal preparation spans 12 to 18 months with weekly mileage of 80 to 120 kilometers, including long mountain runs with significant elevation gain. Sleep management, nutrition strategy, and gear selection are decisive factors: sleepless nights above 2,000 meters, spaced-out aid stations, and technical sections by headlamp demand meticulous preparation.

The atmosphere at the UTMB is unparalleled. Aid stations become festive gatherings where volunteers, families, and spectators cheer runners day and night. The finish in Chamonix, under the illuminated arch facing Mont-Blanc, remains one of the most emotional moments in outdoor sports. Whether first or last finisher, crossing the line after completing the Tour du Mont-Blanc is a life-changing achievement.

UTMB Mont-Blanc is a 171 km trail race with 10,000 m of elevation gain, located in Chamonix, Haute-Savoie. The next edition is scheduled for 28 August 2026.

The course reaches a maximum altitude of 2,537 m. The race is rated 6 ITRA points and features terrain. 1 distances are available for runners.

Find all official information on the race website.