Around 2,500 participants will embark on the Mont Blanc circuit from Chamonix on August 29, 2025. The goal is to complete the race by August 31, with top runners aiming for significantly shorter times. The men's competitive field in this edition of UTMB features several prominent athletes with uncertain outcomes, mirroring the unpredictability of other elite races. UTMB spans 174 kilometers with significant elevation gain across three countries, regarded as a premier event in ultrarunning.
The men's field at this year's UTMB feels a lot like the women's field at this year's Western States 100: wide open.
Amongst the very top men's talent this year, there's an 'if' or a 'but' qualifying every top contender.
UTMB roughly follows the iconic Tour de Mont Blanc trail - a 174-kilometer loop covering 9,900 meters of elevation gain.
No trail ultramarathon men's field will be as deep as the UTMB field.
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