Trail les 40 Bosses
5–6 December 2026 · Saint Leu la Foret (Val-d'Oise)
The races
- 05/12 · 16:3075km d+ 3000m la belle - Trail M75 km3,000 m D+
- 05/12 · 16:30120km 4900m d+ le monstre - Trail XL120 km4,900 m D+
- 06/12 · 08:0045 km d+ m l'historique - Trail S45 km2,000 m D+
- 06/12 · 10:0020 km d+ 850m la classique - Trail XS20 km850 m D+
- 06/12 · 14:0010 km d+ 400m le sprint - Trail XXS10 km400 m D+
Your preparation for Trail les 40 Bosses
You have 5 weeks left.
You can start today.
45 km trail · 2,000 m elevation gain
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I'm starting from scratch
3 runs per week
Your longest run: 33 min
Peak elevation gain: 2,000 m per week
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I've been running for less than a year
3 runs per week
Your longest run: 3 h 10
Peak elevation gain: 2,000 m per week
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I've been running for more than a year
4 runs per week
Your longest run: 2 h 05
Peak elevation gain: 2,000 m per week
20 km trail · 850 m elevation gain
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I'm starting from scratch
3 runs per week
Your longest run: 33 min
Peak elevation gain: 850 m per week
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I've been running for less than a year
3 runs per week
Your longest run: 1 h 41
Peak elevation gain: 850 m per week
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I've been running for more than a year
4 runs per week
Your longest run: 1 h 18
Peak elevation gain: 850 m per week
10 km trail · 400 m elevation gain
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I'm starting from scratch
3 runs per week
Your longest run: 33 min
Peak elevation gain: 400 m per week
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I've been running for less than a year
3 runs per week
Your longest run: 1 h 00
Peak elevation gain: 400 m per week
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I've been running for more than a year
4 runs per week
Your longest run: 53 min
Peak elevation gain: 400 m per week
How to prepare for a trail race
You have 5 weeks left.
Organizer
Other upcoming races · Val-d'Oise
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- La DNF 31 October – 1 November 2026 · Andilly
- Raid'frayant 4 November 2026 · Cergy
- Lions Club et MDN95 : Course contre le Diabète 8 November 2026 · Cergy
- Kid cross EA / Eki cross relais PO à MI et CA à MA 11 November 2026 · Saint Brice sous Foret
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