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. You can run between 20 and 120 kilometers. Visit the organization's website for the most recent information.

Race information

UTMB 20K UTMB 50K UTMB 100K UTMB 100M
120 km
5500 m+
Les 40 Bosses - 120 Km
75 km
3300 m+
Les 40 Bosses - 75 Km
45 km
2100 m+
Les 40 Bosses - 45km
20 km
900 m+
Les 40 Bosses - 20 Km Nocturne
20 km
900 m+
Les 40 Bosses - 20km
Visit the organization's website for the most recent information.
Trail runs nearby

The Les 24h de St Brice will take place in Saint-Brice-sous-Forêt on Saturday 7 June 2025. You can run between 3 and 24 hours.

The Foulées de l'Ardente will take place in Vineuil-Saint-Firmin on Saturday 7 June 2025. You can run between 5 and 15 kilometers.

The Foulées de la Rue will take place in Beauvais on Saturday 7 June 2025. You can run between 5 and 10 kilometers.

The Trail de l'Orangerie de Bonnelles will take place in Bonnelles on Sunday 8 June 2025. You can run between 10 and 39 kilometers.

The Les Foulées de Boissy-Fresnoy will take place in Boissy-Fresnoy on Sunday 8 June 2025. You can run between 5 and 20 kilometers.

The La Bresl'Oise will take place in Bresles on Saturday 14 June 2025. You can run between 10 and 24 kilometers.