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.

     

Destination Alerts

  • 03/12/2018: SNOW AND WINTER CONDITIONS EXIST ABOVE 8000 FEET. EARLY SPRING CONDITIONS EXIST ON LOWER ELEVATIONS.

Avalanche Forecast for 04/26/2018

  • Loose Wet avalanches continue to be the primary concern through the forecast period. Timing is key to avoiding Loose Wet avalanches. Plan your travels to be clear of steep slopes before the snow become unsupportive. Signs the snow is becoming increasingly saturated, loose, and potentially unstable: pinwheels or rollerballs, small wet sloughs, and deep ski or boot-top penetration are indicators that the snow is becoming increasingly unstable and Loose Wet avalanches are becoming increasingly poss 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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