Castor Fou

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+" w..

The Night Round is a running race that will take place on November 30, 2024, in Vert le Petit. This event offers nature trails of 10 km and 17 km, as well as a 10 km Nordic walk, open to both licensed and non-licensed participants. Participants will have the opportunity to explore picturesque trails..

Vertrail by Night is a thrilling night trail running event taking place in the scenic Porchefontaine forest in Versailles. Scheduled for November 30, 2024, participants can choose between two main races: the Petit Vertrail, an 8 km individual trail, and the longer 17 km trail, which can be run solo ..

The Cross de Massy will take place in Massy on Sunday 1 December 2024. You can run between 5 and 9 kilometers.

The Choco Trail d'Hardricourt is a popular running event held in the Yvelines region, featuring various trail distances of 8, 13, 24, and 42 kilometers, along with children's races and hiking options. Scheduled for December 7 and 8, 2024, this event marks its 10th edition and offers participants a c..

The Trail des Arpents is an exciting running event set in the picturesque Rambouillet forest, located in the heart of the Chevreuse Valley. Scheduled for its inaugural edition on December 8, 2024, the event offers two challenging courses: a 17 km route with a 300m elevation gain and a 35 km route wi..