La Sans Raison 35 km is a trail race held in Velizy-Villacoublay, within the Yvelines department of Île-de-France. It begins at 8:30 a.m., offering participants a 35 km off-road route with 850 metres of elevation gain, positioning it as a challenging trail run beyond a simple forest jog. The race details suggest a hilly trail course, not a flat, fast one. A previous runner's account mentioned mud, consistent with a late-season trail event where footing is as critical as speed.

[A CONFIRMER] La Sans Raison - 11 km 2026

Velizy Villacoublay

Driving directions

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Typical weather NOV

7°C low 2°C

45mm precip avg

Cool — dress for changeable weather.

Please verify event details with the organizer before registering.

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