The valley, surrounded by peaks that provide skiing at altitudes as high as 3,450 meters, is part of Parc National de la Vanoise. The altitude assures snow through the late spring; skiing on the Glacier du Pisaillas usually lasts through June and often into July. Val d’Isere and Tignes offers some of the best skiing for experts, with more than two dozen challenging black runs. But it’s the exceptional off-piste terrain that earns bragging rights for skilled skiers. The off-piste skiing in Tignes is largely above the tree line. For 45-degree thrills (and exceptional scenery), go to the North Face of Pramecou; hiring a guide is strongly recommended here, even for experienced alpine skiers.