The Trail Blanc de la Rosière is a night trail race on snow held in Montvalezan, Savoie, France. The next edition is scheduled for early February. Participants can select from 5 km, 10 km, and 20 km distances, suitable for a brief winter excursion or a challenging after-dark mountain run.
Each distance comprises a single loop. The 5 km course involves a 250 m elevation gain, the 10 km course a 400 m gain, and the 20 km course an 800 m gain. The 20 km race is the most popular choice. The event embraces its winter environment, with the organizer stating, “Everything will be white as snow!”, reflecting a format centered on snow, nature, and headlamp running.