Trail ultramarathon · France
Fri, 28 August 2026 · Chamonix, Haute-Savoie
The world's most iconic ultra trail: a full loop around Mont Blanc through France, Italy, and Switzerland. 171 km with 10,000 m of elevation gain.
Entry · UTMB 171K · 2026 edition
The organizer publishes the official results. Entry for the next edition is not on file yet. The organizer announces dates and entry rules; check their site before planning around a place.
From the organizer's page, checked 27 Sep 2026. TrailSplits does not know whether you have a place; the organizer is the final word.
UTMB - Ultra-Trail du Mont-Blanc is a trail ultramarathon scheduled for Fri, 28 August 2026 in Chamonix, Haute-Savoie, France. TrailSplits currently includes 3 mapped courses for this event, with course maps, elevation profiles, weather context, and pacing tools for the uploaded GPX data.
How to get a place: Entry to the UTMB, CCC and OCC needs at least one Running Stone earned at a UTMB World Series race in the past 24 months plus a valid UTMB Index in the right category, then a lottery weighted by Running Stones. For 2026 the lottery pre-registration ran 8-19 January 2026; the 2027 dates are not published yet. Organizer's page, checked Sunday 27 September 2026.
TrailSplits is a free, independent route & pacing companion — not the official race. Visit the official UTMB - Ultra-Trail du Mont-Blanc site →
Racing more than once next year? Add UTMB 171K to a season and see whether your races work together.
Inspect the official course track on a topographic map, through its elevation profile, or in 3D.
› running direction two lines: out and back on the same path kilometres
Selected distance
Vert-focused blueprint with route-finder links into the Planner.
Other distances
Prepare and return
Keep this course, its training plan, calendar and future course updates together in your private My Races page. Saving does not publish your workouts, pace or progress.
UTMB - Ultra-Trail du Mont-Blanc UTMB 171K — 2025 edition. 2100 finishers.
Estimated finish-time percentiles, modeled from the 2025 winning (19h 37m) and median (38h 00m) times — a guide, not official splits.
Race route lab
Open the official course in Planner, then choose a nearby start point to build a shorter loop that matches the course demand. This course averages about 58.4 m climb per km.
Fri, 28 August 2026
Send to your watch
Get the official course as a clean GPX or a Garmin TCX course, with step-by-step instructions to load it onto a Garmin, COROS, Suunto, Wahoo, or Komoot — free, no account needed.
Compare your training
See how faithfully your rehearsal route matches the real race. The official course for UTMB 171K loads as Route A — upload your training route to compare distance, elevation gain, estimated time, and how much of the course you actually cover.
Course analysis
See the UTMB 171K course broken into its major climbs and descents in order — length, gain, average grade, and steepness — so you know where the crux is and how to pace and fuel it.
UTMB - Ultra-Trail du Mont-Blanc 2026 is scheduled for Fri, 28 August 2026 in Chamonix, Haute-Savoie. Check the official race site for registration deadlines and final details.
3 distances (60–172.4 km). The longest course is 172.4 km with about 10,069 m of vertical gain — a demanding mountain course.
The UTMB 171K course has a 46.5-hour cut-off, an average of 16.2 min/km to finish in time. TrailSplits' cut-off pacer shows the buffer at each aid station.
Yes. TrailSplits gives you the course map, an interactive elevation profile, a 3D flyover and a downloadable GPX for every mapped distance — free and with no sign-up.
Each distance has a free, course-specific 16-week training plan built around its distance, vertical gain and cut-offs, plus a pace and cut-off calculator.
No. TrailSplits is a free, independent route and pacing companion. For registration and official rules, visit https://utmbmontblanc.com.
Load the GPX directly into TrailSplits for surface analysis and terrain intel.