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HOKA UTMB Mont-Blanc
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TDS

UTMB World Series
145.0km·9500m+
August 24, 11:50 PM
Courmayeur,
France
utmb·source

Race Pace Calculator · GPX Analyzer · Trail Finder

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Read

  • How to Taper for a Marathon, Half Marathon or Ultra
  • Types of Runs and What Each Workout Actually Trains
  • Hill Training for Trail Runners: Train the Descents

Full calendar: France

TDS · Race profile

Distance
145km
Gain
9500m+
FlatKM
247.8
Max
2576m
Min
727m

About TDS

TDS is the 145km ultra trail at HOKA UTMB Mont-Blanc 2026 (Courmayeur, France). The race starts on August 24, 2026 at 11:50 PM. It starts in Courmayeur and finishes in Chamonix. The time limit is 44 h 55 min.

Race strategy

Hold a steady pace and save energy for every section.

  • 1389m descent. Go easy, save your quads.
  • Steep 38% wall. Control your pace and stay focused.
  • The finish is runnable. Save your legs to run it all the way.
  • Long race. Control your HR and effort. Early mistakes cost the most.
  • Control your HR on the first mountain, save your quads on the descents until 116km, then run your race pace.
  • Start · 0.0km–1.6km · Race-day nerves push your heart rate up: don't follow the crowd, find your own rhythm.
  • Settle in · 1.6km–12.0km · Climb of 1235m. Ease in: hold back more than feels necessary. The race is still ahead. Climb by heart rate or breathing, not pace.
  • Work · 12.0km–71.6km · Descent of 845m averaging 10%, descent of 1389m averaging 12%, descent of 699m averaging 16%. Plus 3 more climbs and 2 descents. This is where the race is built: steady, solid effort. Climb by heart rate or breathing, not pace. This descent is hard on the legs: short steps, stay in control, poles if you have them. Running pays off here: run wherever you can. At altitude your pace drops, and that's fine. Hike the steepest pitches.
  • Fade · 71.6km–138km · Descent of 1829m averaging 14%, climb of 1326m, descent of 889m averaging 16%. Plus 3 more climbs and 2 descents. Your energy fades, and that's normal: hold a steady effort and stop counting the miles. Climb by heart rate or breathing, not pace. This descent is hard on the legs: short steps, stay in control, poles if you have them. Running pays off here: run wherever you can. Hike the steepest pitches. Your heart rate drifts down on its own: don't chase your early-race numbers, go by feel.
  • Home · 138km–147km · 8.8km of runnable trail. No heroics: settle back into your own effort and hold it to the line. Running pays off here: run wherever you can.

Course

The course climbs 9500m+. With 66m/km of climbing, this is a true mountain course with sustained climbs and descents. By gradient, 41% of the distance is uphill, 41% downhill and 18% flat. The longest climb runs 12.7km at an average 15.1% grade (1916m of vertical). The longest descent runs 13.2km at an average 13.8% grade (1829m of vertical). The steepest climb averages 40.1% over 0.4km. The steepest descent drops at 45.3% over 0.6km. Surface: 69% trail, 14% road, 10% technical, and 5% smooth. Flat-equivalent effort: 247.8 FlatKM.

Summits

The highest summit on the course is Arête du Mont Favre (2442m), 11.9km from the start. Other named summits along the route: Tête du Lac de Roselette (2114m) and Bellevue (1801m).

Poles

Trekking poles are strongly recommended: about 28.7km of the course is steep enough for them to pay off.

Quad damage

Quad damage risk is high (index 77 of 100), with 44% of the load in the first half: 6 critical descents, the last of them run on already damaged legs. Downhill-specific preparation and a controlled early pace pay off here.

  • Control your HR on the first mountain, save your quads on the descents until 116km, then run your race pace.
  • #4 · 12.0–14.8 km · 451 m D−, -16.3% · 132.1 km ahead → control
  • #3 · 20.2–28.8 km · 845 m D−, -9.8% · 118.1 km ahead → control
  • #1 · 35.6–47.5 km · 1389 m D−, -11.6% · 99.4 km ahead → control
  • #5 · 67.2–71.6 km · 699 m D−, -16.1% · 75.3 km ahead → control
  • #2 · 77.1–90.3 km · 1829 m D−, -13.8% · 56.6 km ahead → control
  • #6 · 110.6–116.3 km · 889 m D−, -15.6% · 30.6 km ahead → control
  • 133.4–138.1 km · 790 m D−, -16.7% · 8.8 km ahead → your pace
  • Plus 1 more notable descent not listed: your pace.

Weather

On race day, start temperatures have historically ranged from 9°C to 17°C, with around 4°C at the highest point; the chance of precipitation is about 44%. Heavy rain of 10.0mm or more falls on about 9% of days around this date.

Results

715 finishers completed the 2026 edition. Men's winner: Remy Brassac (France) in 19:28:43. Women's winner: Sarah Vieuille (France) in 22:08:16.

This page has the full results and splits, a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for TDS.

Other distances of HOKA UTMB Mont-Blanc 2026UTMB (174km)·CCC (108km)·OCC (60.0km)·MCC (40.0km)·ETC (15.0km)·YCC (15.0km)

Other editions of TDS2025

Official websitemontblanc.utmb.world