November 13
Subject to snowfall — some runs may open earlier
May 25
May extend into spring on higher terrain
Mammoth Mountain typically opens around November 13 each year. The opening date can vary by a few weeks based on early-season snowfall — some high-altitude runs open earlier.
The season at Mammoth Mountain usually runs until May 25. Higher glacier areas (if available) may stay open through spring and early summer.
Peak season runs from Christmas through the February school holidays, when slopes are busiest and prices highest. January mid-week and late March are the best value windows — excellent snow with fewer crowds.