Ski season

A ski season is a period when skiing, snowboarding and other alpine sports are viable in an alpine resort. The season corresponds to when ski lifts are running and lift passes are available. Depending on the latitude and altitude of the resort, the season will typically run from early to mid-winter until mid- to late spring. Ideally the season will be over before the thaw begins.

A typical ski season has three stages, and therefore three levels of lift ticket pricing:

Typically in the United States, a ski season lasts from late November to early April, however larger resorts in Colorado and California are known to spin the lifts as late as the 4th of July.

...
Wikipedia