Decide what apres actually means to you, because France offers two very different versions. The slopeside afternoon party, dancing in ski boots as the music builds, is the La Folie Douce phenomenon you will find above Val Thorens, Val d'Isere, Meribel and Alpe d'Huez. The late night club and bar scene is a separate thing that lives down in the villages. The best resorts, led by Val Thorens, give you both in one walkable place.
Weigh snow reliability against atmosphere. The loudest, most dependable apres sits at altitude, which is why Val Thorens and Tignes top the list: the party never gets cut short by thin snow. Lower, more characterful towns like Morzine and Chamonix trade a little snow certainty for a genuine town's worth of nightlife. If your trip is early or late season, lean high.
Pick a base that matches the budget and the crowd. Les Menuires lets a group party across the whole Three Valleys cheaply, Courchevel does glamour at a premium, and Avoriaz suits younger snowboarding groups. See the regional context in our Europe apres ski ranking and the long season nightlife of Canada apres ski, browse the wider list in best apres ski resorts in Europe, and plan the trip from the France destination guide.