Logo

Les 40 Bosses - Saint-Leu-la-Forêt

Saint-Leu-la-Forêt, France • 30-1 Nov-Dec 2024

Les 40 Bosses is a challenging trail running event held in the Montmorency Forest, featuring its 6th edition on November 30 and December 1, 2024. Participants can choose from various distances, including the grueling 120 km "Le Monstre" with 5500 meters of elevation gain, and the 75 km "La Belle+" with 3300 meters of elevation gain. Other options include a 20 km night trail and shorter daytime races of 45 km, 20 km, and 10 km. Registration is open, and participants are encouraged to sign up early due to limited spots. A new health certification process has been introduced for easier registration. Visit the organization's website for the most recent information.

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

Race information

Website
120 km
5500 m+
120 Km – 5500m D+ le Monstre
75 km
3300 m+
75 Km – 3300m D+ la Belle+
45 km
2100 m+
45 Km – 2100m D+ le Grand Défi de la Forêt de Montmorency !
20 km
900 m+
20 Km – 900m D+ la Boucle Vallonnée de la Forêt de Montmorency !
20 km
900 m+
20 Km Nocturne – 900m D+ la Boucle Nocturne de la Forêt de Montmorency !
10 km
400 m+
10 Km – 400m D+ Découverte de la Forêt de Montmorency !
Visit the organization's website for the most recent information.
Trail runs nearby

Sur la Piste du Père Noël

Bures-sur-Yvette - 36 km from Saint-Leu-la-Forêt

The Sur la Piste du Père Noël will take place in Bures-sur-Yvette on Saturday 14 December 2024. You can run 12 kilometers.

Orrynight

Orry-la-ville - 23 km from Saint-Leu-la-Forêt

The Orrynight will take place in Orry-la-ville on Saturday 14 December 2024. You can run between 5 and 10 kilometers.

Le 13 de Blaincourt

Blaincourt-lès-Précy - 24 km from Saint-Leu-la-Forêt

The Le 13 de Blaincourt will take place in Blaincourt-lès-Précy on Saturday 11 January 2025. You can run between 7 and 13 kilometers.

X-Trail Run - Beaumont-sur-Oise

Beaumont-sur-Oise - 14 km from Saint-Leu-la-Forêt

The X-Trail Run in Beaumont-sur-Oise is an exciting running event set to take place in January 2025. Participants can choose between two scenic courses through the beautiful Carnelle forest: a 15 km route designed for those looking to challenge themselves and a more demanding 30 km course for experi..

Yerres Trail by Night

Yerres - 38 km from Saint-Leu-la-Forêt

The Yerres Trail by Night will take place in Yerres on Saturday 18 January 2025. You can run between 12 and 22 kilometers.

Trail des Marcassins - Saint-Brice-sous-Forêt

Saint-Brice-sous-Forêt - 8 km from Saint-Leu-la-Forêt

The Trail des Marcassins is a running event taking place in Saint-Brice-sous-Forêt, featuring two courses of 17 km and 27 km through the scenic Montmorency forest and Bois des Champeaux. Participants can expect a mix of gentle hills and some challenging ascents, with the chance to spot local wildlif..