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 10 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+
120 Km – 5500m D+
75 km
3300 m+
75 Km – 3300m D+
45 km
2100 m+
45 Km – 2100m D+
20 km
900 m+
20 Km Nocturne – 900m D+
20 km
900 m+
20 Km – 900m D+
10 km
400 m+
10 Km – 400m D+
Visit the organization's website for the most recent information.
Trail runs nearby

The Elle & Lui - Saint-Paul (60) will take place in Saint-Paul on Saturday 20 September 2025. You can run between 15 and 15 kilometers.

The Trail des 3 Forêts - Clichy-sous-Bois will take place in Clichy-sous-Bois on Sunday 21 September 2025.

The La Maurecourtoise will take place in Maurecourt on Sunday 21 September 2025. You can run between 5 and 10 kilometers.

The L'Enjambée de la Mauldre will take place in Maule on Sunday 21 September 2025.

The Trail des Sources de l'Yvette (TSY) will take place in Lévis-Saint-Nom on Sunday 21 September 2025. You can run between 10 and 47 kilometers.

The Urban Trail de la Butte Montmartre will take place in Paris on Sunday 21 September 2025. You can run between 7 and 7 kilometers.