An extraordinary ultramarathon through the Alps
The Ultra-Trail du Mont-Blanc (UTMB) is one of the world’s most prestigious trail-running events, held every year in Chamonix at the foot of Mont Blanc. First organised in 2003, the legendary race covers around 174 km with nearly 10,000 metres of elevation gain, following the historic Tour du Mont-Blanc route through France, Italy, and Switzerland.
Runners must complete the demanding course within 46 hours and 45 minutes, crossing steep mountain passes, technical alpine trails, and changing mountain weather. Over the years, UTMB has grown into a full week of races, attracting thousands of runners from more than 100 countries and earning its reputation as one of the most challenging ultramarathons in the world.
What to Expect
UTMB week transforms Chamonix into a vibrant gathering for the global trail-running community. The atmosphere is electric as thousands of runners, supporters, and spectators fill the streets.
Highlights of the event include:
- The dramatic mass start in Chamonix, where runners begin their journey through the Alps.
- Challenging mountain passes and spectacular alpine scenery along the route.
- Multiple races of different distances are held throughout the week.
- A lively event village with outdoor brands, talks, films, and activities for visitors.
About the Area
Nestled at the foot of Mont Blanc, Chamonix is one of the most famous mountain destinations in the Alps. Surrounded by dramatic peaks, glaciers, and alpine meadows, the valley attracts visitors year-round for outdoor adventures and breathtaking scenery.
The area is especially popular for hiking, mountaineering, skiing, and scenic cable-car rides that reveal spectacular views of the surrounding mountains. Charming alpine villages, traditional restaurants, and scenic trails make the region a favourite destination for nature lovers and outdoor enthusiasts.
Event Details
Name of the event: Ultra-Trail du Mont-Blanc (UTMB)
Location: Chamonix, France
Date: 28 August 2026
Official Event Website: https://montblanc.utmb.world/races/UTMB
