UTMB
UTMB is the 174 km Mont-Blanc loop from Chamonix, a 100M final with 9,900 meters of climbing, major crowds, and a full alpine night out for the field.
UTMB quick facts
- Flagship 100M final of the UTMB World Series Finals in Chamonix.
- 174 km course with about 9,900 meters of climbing.
- Entry uses Running Stones, a valid UTMB Index, and the Mont-Blanc registration process.
- Ultra-distance entry in Marathon Scout; not a 26.2-mile Boston qualifier.
What is the UTMB?
UTMB is the flagship race of the Mont-Blanc week and one of trail running's highest-demand starts. This Marathon Scout entry covers the 174 km mountain ultra as an elite destination trail event, not as a conventional marathon.
UTMB course route
The route loops around Mont Blanc from Chamonix, crossing high alpine terrain in France, Italy, and Switzerland before returning to town. The race lists 174 km, 9,900 meters of climbing, and a 46 hour 45 minute cutoff.
Weather for the UTMB
Late August can bring warm valley miles, cold nights, rain, wind, or snow at altitude. Runners need mountain-weather gear and pacing discipline because conditions can change repeatedly across the full loop.
Past UTMB dates and results
| Year | Date | Status | Results |
|---|---|---|---|
| 2026 | Friday, August 28, 2026 | — | — |
UTMB FAQ
When is the UTMB?
The 2026 UTMB is on Friday, August 28, 2026.
How do I register for the UTMB?
You can register for the UTMB at montblanc.utmb.world.
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