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Wildstrubel by UTMB
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Wild Glacier Marathon

UTMB World Series
41.0km·2500m+
September 10, 08:00 AM
Lenk,
Switzerland
utmb·source

Race Pace Calculator · GPX Analyzer · Trail Finder

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Read

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  • Types of Runs and What Each Workout Actually Trains
  • Hill Training for Trail Runners: Train the Descents

Full calendar: SwitzerlandMarathon trail race calendar

Wild Glacier Marathon · Race profile

Distance
41.0km
Gain
2500m+
FlatKM
64.7
Max
2749m
Min
1063m

About Wild Glacier Marathon

Wild Glacier Marathon is the 41.0km trail race at Wildstrubel by UTMB 2027 (Lenk, Switzerland). The race starts on September 10, 2027 at 08:00 AM. It starts in Lenk and finishes in Crans-Montana. The time limit is 10 h 30 min.

Race strategy

Run easy on the first mountain, then go all out on the second.

  • 321m descent. Go easy, save your quads.
  • Big early climb with 1310m gain. Control your HR at altitude.
  • Steep 32% wall. Control your pace and stay focused.
  • The finish is runnable. Save your legs to run it all the way.
  • Control your HR on the first mountain, save your quads on the way down from it until 12.1km, then run your race pace.
  • Start · 0.0km–2.2km · Race-day nerves push your heart rate up: don't follow the crowd, find your own rhythm.
  • Settle in · 2.2km–21.6km · Climb of 812m, descent of 321m averaging 17%, climb of 1313m, high point 2751m. Ease in: hold back more than feels necessary. The race is still ahead. 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. At altitude your pace drops, and that's fine. Hike the steepest pitches.
  • Work · 21.6km–31.1km · Descent of 1298m averaging 14%. This is where the race is built: steady, solid effort. This descent is hard on the legs: short steps, stay in control, poles if you have them. At altitude your pace drops, and that's fine. Hike the steepest pitches.
  • Home · 31.1km–39.0km · 7.8km 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 2500m+. With 61m/km of climbing, this is a true mountain course with sustained climbs and descents. By gradient, 40% of the distance is uphill, 38% downhill and 22% flat. The longest climb runs 10.2km at an average 8.0% grade (812m of vertical). The longest descent runs 9.6km at an average 13.6% grade (1298m of vertical). The steepest climb averages 41.1% over 0.3km. The steepest descent drops at 30.3% over 0.2km. Surface: 58% trail, 21% technical, 9% smooth, and 7% road. Flat-equivalent effort: 64.7 FlatKM.

Poles

Trekking poles are worth taking: about 7.2km of the course favours them.

Quad damage

Quad damage risk is moderate (index 26 of 100), with 25% of the load in the first half: 2 descents deserve a plan and a couple of downhill sessions before race day.

  • Control your HR on the first mountain, save your quads on the way down from it until 12.1km, then run your race pace.
  • #1 · 10.2–12.1 km · 321 m D−, -16.6% · 26.8 km ahead → control
  • #2 · 21.6–31.1 km · 1298 m D−, -13.6% · 7.8 km ahead → your pace

Weather

On race day, start temperatures have historically ranged from 7°C to 15°C, with around 7°C at the highest point; the chance of precipitation is about 48%. Heavy rain of 10.0mm or more falls on about 10% of days around this date.

This page has a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for Wild Glacier Marathon.

Other distances of Wildstrubel by UTMB 2027Wild 110 (113km)·Wild 70 (72.0km)·Wild 55 (55.0km)·Wild 25 (26.0km)·Wild 10 (10.0km)

Official websitewildstrubel.utmb.world