The lull before peak season runs from roughly the third week of November—when many resorts open over American Thanksgiving—until just before Christmas on December 25. Or book a spring skiing trip at the season’s tail end, starting early March. Depending on the location, elevation, and size of the resort, spring skiing lasts into April or even as late as mid-May.
At mammoth mountains like Whistler Blackcomb, downhilling might extend into June on the summits. (Die-hard, experienced skiers and riders can even have the unique pleasure of hitting the slopes mid-summer on Whistler’s extraordinary Horstman Glacier in June and July.)