Duo étoilé: team spirit
Duo Étoilé
Discover the special atmosphere of a 21km with 1450m D+/- night race, where team spirit and sharing are the keywords: you'll leave with stars in your eyes!
To take part in this race, it is recommended to have good mountain running experience, to be comfortable on all types of terrain and to be self-sufficient for several hours. Please note that a runner with an UTMB index inferior to 240 points has very little chance to finish the race, so it is recommended to register for another Mont-Blanc Marathon race.
Race info
21 km short trail, by night and in pairs
1450m D+/-
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 finish feed station
Interactive map PDF map Estimated passage times Race profile
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 a race bag containing all compulsory equipment, to enable a timing chip to be fitted and equipment to be checked.
No bibs will be issued to runners without their compulsory equipment and identity papers. 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. For this reason, the following equipment is mandatory:
- 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.
- Carrefour du Chemin Caillet (km 4 ) : Start time + 1h15 of race.
- Montenvers refreshment point (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.
A runner arriving at a time barrier after the time barrier has been applied 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.
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
The organizers remind racers that, depending on the systems and settings used, GPX tracks may give different results for race distances and elevation gains.
