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The Ultra-Trail du Mont-Blanc (UTMB) is an iconic trail race that takes place around the Mont-Blanc massif, crossing France, Italy and Switzerland. It takes place from 25 to 29 August 2025.
Here are some key facts about the 2025 edition:
UTMB is a set of 7 races from 15 to 300 kms
Start date:Friday 29 August 2025 at 6pm, in Chamonix.
Distance: The main race covers approximately 171 kilometres with a positive ascent of 10,000 metres.
Maximum time allowed:Participants have up to 46 hours and 30 minutes to complete the race.
Associated events:The UTMB is part of a series of events and races that allow runners to collect "Running Stones" to enter the UTMB entry lottery.
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