Utmb 2024 Chamonix Weather. Access to the occ is open to all runners with at least one.  — more than 40 trail running events all over the world to live the utmb experience close to home:

 — this year, the utmb course is 176 kilometers (109.3 miles) long with almost 10,000 meters (32,500 feet) of elevation gain as it encircles the mont blanc massif from. The weather is one of the biggest challenges athletes face when competing at utmb.