La Belle d'Orgères is a trail and walk weekend held at the Complexe sportif in Orgères, Ille-et-Vilaine, Brittany. It typically takes place in late October or early November, featuring daytime trail races, night trails, children's races, a 10 km walk, and some unique additions. Adult runners can select from 10 km, 15 km, or 26 km courses, while the night program offers 10 km or 15 km for participants with headlamps. The event also includes youth races of 750 m, 1500 m, and 3000 m, ensuring participation for those new to trail running.
The 26 km trail is the longest distance, supported by two aid stations, whereas the 15 km trail has one. The 10 km night trail is shorter and does not include an aid station. Walkers have a 10 km route without a bib. Runners interested in multiple events can enter a challenge that combines a Saturday race with a Sunday race. The petit défi links the Saturday 10 km with the Sunday 15 km, and the grand défi pairs the Saturday 10 km with the Sunday 26 km. A distinctive tradition is the adult-only “course en slip,” a nearly 3 km run in underwear. For every registration, €2 is donated to Loisirs Pluriel and Institut Curie. Post-race, the atmosphere includes drinks and Breton galettes saucisses.