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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.

France Val-d'Oise Île-de-France Saint-Leu-la-Forêt

Race information

Website
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

La DNF - Andilly (95)

Andilly - 4 km from Saint-Leu-la-Forêt

The La DNF - Andilly (95) will take place in Andilly on Friday 31 October 2025. You can run 10 kilometers.

Trail'Oween

Les Clayes-sous-Bois - 29 km from Saint-Leu-la-Forêt

The Trail'Oween will take place in Les Clayes-sous-Bois on Saturday 1 November 2025. You can run between 10 and 20 kilometers.

La Saut'trail

Verberie - 48 km from Saint-Leu-la-Forêt

The La Saut'trail will take place in Verberie on Saturday 1 November 2025. You can run between 5 and 21 kilometers.

10 km Course Nature et Cross du Val d'Europe Chessy Montévrain

Chessy - 41 km from Saint-Leu-la-Forêt

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The 10 km Course Nature et Cross du Val d'Europe Chessy Montévrain will take place in Chessy on Sunday 9 November 2025. You can run between 7 and 10 kilometers.

Trail des Châtaignes

Cormeilles-en-Parisis - 6 km from Saint-Leu-la-Forêt

The Trail des Châtaignes will take place in Cormeilles-en-Parisis on Saturday 15 November 2025. You can run between 17 and 36 kilometers.

UTMB Index

Les Flambeaux

Montfort-l'Amaury - 42 km from Saint-Leu-la-Forêt

The Les Flambeaux will take place in Montfort-l'Amaury on Saturday 15 November 2025. You can run between 10 and 18 kilometers.