Le Trail des Carrons begins in Bellegarde, a hamlet in Priay, located in the Ain department of France’s Auvergne-Rhône-Alpes region. This forest trail event typically occurs in late June, offering timed 9 km and 17 km runs, alongside untimed walks covering the same distances. The 9 km course involves a 230 m elevation gain, and the 17 km course gains 350 m. Both routes are short but feature significant climbs. The event also includes races for children and juniors, welcoming adults and children, runners and walkers.
The longer walk commences early, with the 17 km trail starting before the 9 km. Children's races are scheduled between these in the morning. A portion of each entry fee supports MERMOZ AVENIR SANTE. The race's slogan is “Crois en ton Ain-stinct,” a play on words referencing the Ain department. Additionally, two "Challenges for Valérie" are held: one recognizes the largest registered group, and the other pairs randomly selected men and women for a 9 km combined-time competition, without requiring the pair to run together. The event has experienced at least one skipped edition, so verifying details with the organizer or unautresport.com is advisable before making plans.