The Trail du Château d’Ecouen is a forest trail race starting in Ecouen, Val-d’Oise, north of Paris, offering 10 km and 20 km distances. The primary races are self-sufficient, requiring participants to carry their own water and food. USEE Athlétisme is the organizer for this 14th edition.
The course winds through forest and undergrowth on a loop, featuring genuine climbs instead of flat park paths. The 10 km race involves approximately 280 meters of elevation gain, and the 20 km race covers double the distance with around 560 meters of climbing. Free 450-meter races are also available for children aged 6 to 8 and 9 to 10.