The Trail du Château des Rochers is a trail-running series held in Nogent-sur-Oise, Picardy, beginning at 1 rue Faidherbe. The event offers several running options: a short solo run, a relay, and a longer Trail XS race. Specific distances include a 10 km solo trail, a 15 km trail, a 2x5 km relay, and a 30 km route with 700 meters of elevation gain. The 10 km solo race and the relay commence at 4 PM, and the event features night courses.
The series provides distinct participation choices. Solo runners may select a short or middle-distance trail. Pairs can share the 10 km relay. Experienced trail runners can opt for the 30 km Trail XS format. This longer race is categorized within the 25-44 KmE range, acknowledging the added challenge from its climbs. Now in its eighth edition, the event has established itself over several years.