23 kmTrail🇫🇷 Chamonix, France

Mont-Blanc 23K

Saturday, 26 June 2027Estimated dateIn 8 months · Start 07:00

Official site

A short, steep mountain race from Chamonix via La Flegere to finish high above the valley at Planpraz.

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Facts checked 10 Oct 2026 against marathonmontblanc.fr, marathonmontblanc.fr.

Elevation gain

1,680 m

Mountain · ↓ 870 m

Start altitude

1,041 m

above sea level, from terrain data

Temp at start

14°C

Peaks around 22°C

Entry fee

≈ $55

Lottery

Finishers

—

typical year

Course

Point to point

6h cut-off

Getting thereFly into GVA (Geneva), about 68 km from the start

Course map

A detailed route is not available for this race yet. The marker shows the race location.

Elevation profile

Mountain: about 1,680 m of climbing and 870 m of descent. A detailed profile isn’t available for this race yet.

Race-day weather

At start

14°C

Peak during race

22°C

Humidity

68%

Chance of rain

19%

Wind

3 km/h

Race day in past years

Historical averages for 26 June ±3 days, 2016–2025, from 07:00 for 5 hours (70 days sampled). Source: Open-Meteo / ERA5.

What time could you run here?Adjust your goal time for this course’s hills and typical race-day weather.Race time calculator →

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Show your runners the course facts and race-day weather. Paste this code into your site; it displays the badge below and links to this page. It updates automatically when the race details change.

<a href="https://irun42.com/race/mont-blanc-23k" title="Mont-Blanc 23K on iRun42"><img src="https://irun42.com/badge/mont-blanc-23k.svg" width="300" height="120" alt="Mont-Blanc 23K: course, elevation and race-day weather on iRun42" /></a>