Duo étoilé: team spirit
Duo Étoilé
Discover the special atmosphere of a 21km, 1450 m +/- night race, where team spirit and sharing are the watchwords: you'll leave with stars in your eyes!
To take part in this race, you'll need to have some experience of mountain running, 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 240 points has very little chance of finishing the race, so we recommend that you take part in another Mont Blanc Marathon event.
2025 race route
21 km short trail, night-time, in pairs
1450m +/-
Open to Espoir category and above
Limited to 500 teams
2 runners must complete the entire course together.
Maximum time: 6h30
2 full feed stations
1 refreshment station at finish
Number withdrawal
You can pick up your Star Spangled Duo race number by appointment only, at the Espace EMC2 on Place du Mont-Blanc (Chamonix):
Thursday June 26, 2025 from 9am to 9pm
Friday June 27, 2025 from 9am to 9pm
Saturday June 28, 2025 from 9am to 6pm.
Runners must present photo identification and their race bag, including all mandatory equipment, to enable a timing chip to be fitted and equipment to be checked.
No bibs will be issued to runners without their mandatory equipment and identification documents. No race numbers will be issued after 6:00 p.m. on Saturday.
Compulsory equipment
As this event takes place at night and on mountain trails at altitudes between 1000 and 2200 metres, weather conditions can change very quickly. It is therefore essential to bring the following equipment to protect yourself against bad weather.
- Cell phone in working order.
- Water supply of at least 0.50 liters.
- Waterproof jacket with hood (gore-tex type) adapted to your size.
- Head or chest lamp in working order, with spare batteries.
- Survival blanket (140cm x 200cm).
- Whistle.
- Tumbler.
Recommended equipment
- Cap.
- Tights.
- Gloves.
- Bowl and spoon.
Time barriers
The time limits given below are for guidance only. In the event of adverse weather conditions, and for safety reasons, the organization reserves the right to stop the event in progress or modify the time limits. All decisions will be taken by the race jury.
A runner arriving at a time barrier after the deadline will be disqualified. The lower right-hand corner of the race number will be "cut out" by the station chief and the runner will be invited to return to Chamonix. Should the runner wish to continue on the course, his or her number will be collected by the station chief and the runner will no longer be considered a participant in the Mont Blanc 90km, and will therefore no longer be under the responsibility of the organizer. Anyone disrespecting the volunteers responsible for enforcing the time limits will be banned from all Mont Blanc Marathon events.
- Carrefour du Chemin Caillet (km 4 ) : Start time + 1h15 of race.
- Montenvers refreshment station (km 7): Start time + 2h30 race.
- Refuge du Plan de l'Aiguille refreshment point (km 13 ): Start time + 4h30 of race.
- Maximum race time - Chamonix finish (km21): Start time + 6h30.
Maximum race time
Runners crossing the finish line after the maximum race time will not be classified and therefore not considered as finishers. This maximum time is calculated according to the start time.
Star duo: maximum race time 6h30