Les Lumières de la Muzelle begins at sunset from La Troïka in Les Deux Alpes, a high mountain resort in Isère in the French Alps. This night snow trail race, held in mid-January, is organized by the Les 2 Alpes Trail association and offers four distances: 11 km, 16 km, 21 km, and 42 km. The name references La Muzelle, a 3,465-meter summit in the Écrins massif, and the light display accompanying the race from dusk into darkness.
The race is entirely nocturnal, with participants navigating snow by headlamp as Les Deux Alpes and nearby villages are illuminated below. The shortest route features 275 meters of elevation gain and 675 meters of descent, primarily downhill. The longest option transforms the same winter landscape into a 42 km mountain challenge. Approximately 1,800 to 2,000 runners are anticipated, including seasoned snow-trail participants and individuals attracted by the unique start time, the headlamp procession, and the opportunity to compete on snow after sunset. The event was previously known as the Night Snow Trail, a name that still highlights its distinctive nature.