23km: an historic race
23km du Mont-Blanc
Created in 1979, the Cross du Mont-Blanc will celebrate its 47th edition in 2026.
This friendly race, whose course has remained virtually unchanged since its inception, will take you in the footsteps of the discipline's pioneers, all set against a panorama of dazzling beauty!
To take part in this race, you'll need to have previous mountain running experience, be comfortable on all types of terrain and be self-sufficient for several hours. We draw your attention to the fact that a runner with an UTMB performance index of less than 270 points has very little chance of completing the race, so it is recommended that you take part in another Mont Blanc Marathon event.
Race info
23km semi-autonomous trail run
1680m D+ / 870m D-
Open to "Espoirs" category and above
Limited to 2,000 runners
6 starting waves
Maximum time: 6 hours
2 full feed stations + 1 finish feed station
Race Bib Pickup
Race bibs for the 23km race will be available by appointment only at the EMC2 space located at Place du Mont-Blanc (Chamonix):
- Thursday, June 25, 2026, from 9 a.m. to 9 p.m.,
- Friday, June 26, 2026, from 9:00 a.m. to 9:00 p.m.
Runners must present a photo ID and their race bag containing all required gear so that a timing chip can be attached and their equipment can be checked.
No race bibs will be issued to runners who do not have their mandatory gear and identification documents.
Mandatory Equipment
- A working cell phone.
- At least 1 liter of water.
- Waterproof jacket with a hood (Gore-Tex type) that fits properly.
- Survival blanket (140 cm x 200 cm).
- Cup.
- Whistle.
- Cash.
Recommended gear
- Beanie.
- Tights.
- Gloves.
Time Cuts
The time limits listed below are provided for informational purposes only. In the event of adverse weather conditions, and for safety reasons, the organizers reserve the right to halt the race in progress or to modify the time limits. Any decision will be made by the race jury.
- Montroc Aid Station (km 11.4): start time of the last wave + 2h30.
- La Flégère Aid Station (km 18.4): Start time of the last wave + 4h30.
- Maximum race time – Chamonix Planpraz (23 km): Starttime of each wave + 6 hours.
If a runner reaches a time cut-off point after that cut-off has been enforced, they will be disqualified. The lower right corner of the race bib will be “cut off” by the station chief, and the runner will be asked to return to Chamonix. If the runner wishes to continue the course, their race bib will be collected by the checkpoint manager, and the runner will no longer be considered a participant in the 90 km Mont-Blanc race; they will therefore no longer be under the organizer’s responsibility. Anyone who shows disrespect toward volunteers and members of the organizing committee responsible for enforcing time limits will be permanently banned from all Mont-Blanc Marathon events.
Maximum Race Time
Runners who cross the finish line after the maximum race time will not be ranked and will therefore not be considered finishers. This maximum time is calculated based on the start time of your wave.
23km du Mont-Blanc: Maximum race time: 6:00
The organizers would like to remind runners that, depending on the systems and settings used, GPX tracks may yield different results regarding race distances and elevation gain.
Runner bags
