Mammoth Mountain

  • The most prominent geological feature in the area, 11,053-foot Mammoth Mountain is a dormant composite volcano formed by a series of eruptions between 220,000 and 57,000 years ago. Steam-blast eruptions occurred from vents on the north side of the mountain as recently as 700 years ago. Since 1990, increases in earthquake swarms, gas venting and tree kills have led to heightened monitoring by the US Geological Survey. Extensive facilities for fee-based downhill skiing and snowboarding, as well as mountain biking in summer and an interpretive center on the summit, are operated under a lease with the US Forest Service.

     

  • The most prominent geological feature in the area, 11,053-foot Mammoth Mountain is a dormant composite volcano formed by a series of eruptions between 220,000 and 57,000 years ago. Steam-blast eruptions occurred from vents on the north side of the mountain as recently as 700 years ago. Since 1990, increases in earthquake swarms, gas venting and tree kills have led to heightened monitoring by the US Geological Survey. Extensive facilities for fee-based downhill skiing and snowboarding, as well as mountain biking in summer and an interpretive center on the summit, are operated under a lease with the US Forest Service.

     

Avalanche Forecast for 03/25/2019

  • The avalanche danger will be MODERATE at Upper and Middle elevations today. Wind slab avalanches on N-E aspects are the chief concern primarily in the northern part of the forecast zone. Avalanche danger remains less concerning in the southern end of the forecast zone where much less snow fell over the weekend.THE SHADY REST WINTER TRAILS WERE LAST GROOMED AT 9:00 AM 3/25/19 Find out More

Reviews

July 15, 2013

“Just did the hike. Very pleasant and comfortable. Took me 2.5 hours because I got lost when I reached Kamikaze Gate. At that junction, there is real need for some direction. The map there only shows the bike trails. Other than that it was great.”

Daniele S., California

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