Utmb 2024 Chamonix Vallee. Featured in events calendar updated 4 june 2024. With multiple races throughout the event, here are the start dates and times of the main races you’ll want to follow.

In 2023, the utmb started at 1800 local time (1700 bst) on friday september 1, 2023, with runners having 46 hours 30 minutes to complete the course. A mythical race, a unique experience.