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About RaceIndexOur methodologyData coverageCyclingTriathlon
  • Ultramarathon
  • 90 km
  • Chamonix-Mont-Blanc
  • Event dates –
  • Past event

Marathon du Mont-Blanc, Chamonix Ultramarathon

This race edition

Race date
Date not confirmed for this distance
Race timezone
Timezone not confirmed
Edition status
Status not confirmed

Entry options

2026 edition

Entry options are not yet confirmed for this edition. Check the organiser before making plans.

Official event website ↗
Data current as of Source last verified

Decision summary

Marathon du Mont-Blanc, Chamonix Ultramarathon at a glance

Cut-off average pace
16:00/km

24:00:00 total limit divided by distance. Check gun/chip timing and intermediate limits; allow time for stops.

Typical conditions
67/100

Historical race-date favourability, not a forecast

Evidence depth
21 verified facts

Source facts available

Route details

Known course facts at a glance

Methodology →

Marathon du Mont-Blanc, Chamonix Ultramarathon has known course details for its ultramarathon race. The summary below keeps the focus on what is confirmed for the course.

Official distance
90 km
Terrain
Trail
Scenery
Waterfront, Mountain, Forest, Countryside, Lakeside

Quick answers

What runners ask first

How hilly is the Marathon du Mont-Blanc, Chamonix Ultramarathon?

The Marathon du Mont-Blanc, Chamonix Ultramarathon is described as mountainous. The course listing puts the climb at 6,330 m.

Race character

Scenery

  • Waterfront
  • Mountain
  • Forest
  • Countryside
  • Lakeside

Atmosphere

  • Destination
  • Community
  • Wilderness

Terrain

  • Trail
Elevation character
Mountainous
Technicality
Very Technical
Source-stated ascent
6,330 m
Net elevation
0 m

Entry, logistics and records

Entry requirements

Entry status
Past event: The listed edition date has passed.
Cut-off
Maximum 24h00 for the 90km.
Sold out
Yes

Course facts

Notable features
  • A multi-race weekend (90km, 42km, 23km, 10km, KM Vertical, Duo Etoile, Young Race, Mini-Cross) held 25-28 June 2026
  • Eco-conscious entry: 10% of bibs reserved for Chamonix valley residents arriving by public transport/foot/bike, 40% for entrants committing to arrive by train or bus, with mandatory carbon offsets

What are typical race-day conditions?

  • 17°CTypical temperature
  • 7 kphTypical wind
  • 4 mmTypical rainfall
  • 67Favourability /100
Typical conditions for the race date and locality, warmer than the endurance-optimal window. These are climatological norms, not a forecast, and are shared across every distance at this event.

How we calculated this

Published facts and derived model outputs on this page are tied to stored sources or a published, version-locked methodology. We show the provenance so runners, coaches and organisers can check it. Data on this page is current as of .

Derived numbers use scoring-methodology-v1.0.

Sources used on this page (2)

Read the full methodology →