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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.
Trail runs nearby

Trail Tour du Massif Montmorencéen (2T2M)

Montlignon - 3 km from Saint-Leu-la-Forêt

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The Trail Tour du Massif Montmorencéen (2T2M) will take place in Montlignon on Saturday 5 April 2025. You can run between 11 and 81 kilometers.

UTMB Index

Trail Urbain de Sèvres

Sèvres - 22 km from Saint-Leu-la-Forêt

The Trail Urbain de Sèvres will take place in Sèvres on Sunday 6 April 2025. You can run between 7 and 14 kilometers.

10km du Bois de Boulogne

Hauts-de-Seine - 21 km from Saint-Leu-la-Forêt

The 10km du Bois de Boulogne will take place in Hauts-de-Seine on Sunday 6 April 2025. You can run 10 kilometers.

Foulees Vairoises

Vaires-sur-Marne - 33 km from Saint-Leu-la-Forêt

The Foulees Vairoises will take place in Vaires-sur-Marne on Sunday 6 April 2025. You can run between 5 and 10 kilometers.

Le Trail de Fay-Les-Etangs

Fay-les-Étangs - 34 km from Saint-Leu-la-Forêt

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The Le Trail de Fay-Les-Etangs will take place in Fay-les-Étangs on Sunday 13 April 2025. You can run between 10 and 20 kilometers.

Semi-Marathon des 4 Communes

Cauvigny - 31 km from Saint-Leu-la-Forêt

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The Semi-Marathon des 4 Communes will take place in Cauvigny on Monday 21 April 2025. You can run between 5 and 21 kilometers.