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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. You can run between 20 and 120 kilometers. 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
120 km
5500 m+
Les 40 Bosses - 120 Km
75 km
3300 m+
Les 40 Bosses - 75 Km
45 km
2100 m+
Les 40 Bosses - 45km
20 km
900 m+
Les 40 Bosses - 20 Km Nocturne
20 km
900 m+
Les 40 Bosses - 20km
Visit the organization's website for the most recent information.
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