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Les 40 Bosses

Name: Les 40 Bosses
Start: 2025-12-06
End: 2025-12-07
Location: Saint-Leu-la-Forêt

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 10 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

120kms

75 km

75kms

45 km

45kms

20 km

20kms

20 km

20kms Nocturne

10 km

10kms

Visit the organization's website for the most recent information.

Trail runs nearby

Saturday Jan 10

Trail Urbain de la Galette

Mantes-la-Jolie

12 km

The Trail Urbain de la Galette will take place in Mantes-la-Jolie on Saturday 10 January 2026. You can run 12 kilometers.

Saturday Jan 10

Le 13 de Blaincourt

Blaincourt-lès-Précy

7 km

13 km

The Le 13 de Blaincourt will take place in Blaincourt-lès-Précy on Saturday 10 January 2026. You can run between 7 and 13 kilometers.

Sunday Jan 11

Trail de Beaumont

Beaumont-sur-Oise

15 km

31 km

The Trail de Beaumont will take place in Beaumont-sur-Oise on Sunday 11 January 2026. You can run between 15 and 31 kilometers.

Fri - Sat Jan 16-17

Yerres Trail by Night

Yerres

12 km

22 km

The Yerres Trail by Night will take place in Yerres from Friday 16 January 2026 to Saturday 17 January 2026. You can run between 12 and 22 kilometers.