From Mike Doyle,
Your Guide to Skiing.
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A. The length of a typical ski season varies by mountain, and by location. The average length of a ski season is five - six months, but some mountains are able to stay open longer due to higher elevations, colder temperatures, or extensive snowmaking systems.

In northeast America, Killington Ski Resort gets 250 inches of natural snow each year and has the country's largest snowmaking system. Because of this, Killington has the longest ski season in the Northeast. The ski season is Killington generally starts in November, and Killington usually closes during the month of April.

In western America, Mammoth Mountain Ski Area opens in November. However, Mammoth Mountain is open for a long time and in some seasons, Mammoth doesn't close until the 4th of July!

The ski season really does vary by mountain and location, as well as snowfall, but during a winter with average snowfall and normal conditions, the ski season will last 5-6 months.