Les 40 Bosses - Saint-Leu-la-Forêt

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.