Utmb Mont Blanc 2025 Dates. Ultra trail du mont blanc, du 26 aug to 1 sept 2025. He won the 2025 mont blanc 90k, up from fourth in 2023, and taking 19 minutes off his time.

The best athletes and 10’000 runners meet around the mont blanc each year. The ultra trail du mont blanc (utmb) is one of the world’s best known endurance running events, taking place each august.