Mammoth Mountain

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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.
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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 11/27/2024

AVALANCHE FORECAST: Over the past five days, two storms brought periods of heavy snowfall, strong winds, and dangerous avalanche conditions to the region. As the weather settles, avalanches breaking in new and wind-drifted snow will become less likely. Be prepared to assess the recent snow for signs of instability, like cracking underfoot, before venturing into avalanche terrain. We have very limited information about the snowpack at mid and upper elevations. If old snow has formed weak layers near the base of the snowpack, you can expect avalanche conditions to settle more slowly. Find out More

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Directions

Destination Activities
Public Services
Hours of Operation: All day

Season: Year Round
This destination is accessed directly from the Mammoth Mountain Ski Area Main Lodge.
- Get driving directions to Mammoth Mountain Ski Area Main Lodge
- Get public-transit options*
*Note that not all facilities are accessible via public transit.

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