Les 40 Bosses

Saint-Leu-la-Forêt, France • 6-7 Dec 2025

The Les 40 Bosses will take place in Saint-Leu-la-Forêt from Saturday 6 December 2025 to Sunday 7 December 2025. Visit the organization's website for the most recent information.

Race information

UTMB 20K UTMB 50K UTMB 100K UTMB 100M
Les 40 Bosses - 120 Km
Les 40 Bosses - 20 Km Nocturne
Les 40 Bosses - 20km
Les 40 Bosses - 45km
Les 40 Bosses - 75 Km
Visit the organization's website for the most recent information.
Trail runs nearby

The Course Dau'Fis will take place in Le Vésinet on Thursday 9 October 2025. You can run 5 kilometers.

The La Hongremanienne will take place in Magny-le-Hongre on Saturday 11 October 2025. You can run 16 kilometers.

The Trail des Nouettes will take place in Versailles on Sunday 12 October 2025. You can run between 10 and 18 kilometers.

The Hautil Trail Tour will take place in Pontoise on Sunday 12 October 2025. You can run between 17 and 30 kilometers.

The Rétro Run - Saint-Ouen-sur-Seine will take place in Saint-Ouen-sur-Seine on Sunday 12 October 2025. You can run between 5 and 10 kilometers.

The Trail des 7 Hameaux will take place in Magny-les-Hameaux on Sunday 12 October 2025. You can run between 13 and 24 kilometers.