Trail de l'Oppidum in Chalencon is centered on the Oppidum name, offering trail races, Nordic walking, hiking, and children's runs. Registration closes in early June. Adults can select the Grand Oppidum 25 km trail, the Oppidum 17 km trail or Nordic walk, the P'tit Oppidum 10 km trail, La Nordique 13 km, or Les Leuks, a 10 km hike.
The event caters to various participants: trail runners have three distances, walkers have Nordic and hiking choices, and children can enter short races of 300 m, 550 m, and 750 m. Older children and young teens also have Les Lievres, a 1.7 km discovery trail. The longest race was established by the mid-2000s, with shorter trail, Nordic, and hiking options introduced subsequently.