Mammoth Mountain snow report
California's high-altitude outlier: seasons swing from lean to absurd (20 m+ in record winters). The accumulation range on this page earns its keep here.
United States · North America · live from the weather model at 2424–3369 m
Conditions right now
Read at summit elevation the moment you opened this page.
Hourly windows, accumulation ranges, confidence and travel flags, or the transparent 0–100 Ski Meter score.
Weather data by Open-Meteo.com (CC BY 4.0), adapted for display. Elevations are approximate published figures; forecasts are model estimates, not guarantees.
The mountain right now
The live freezing level drawn on the elevation profile. Above the snow line, precipitation falls and stays as snow.
Terrain shape is schematic; elevations are the resort's approximate published figures.
Why it snows here
A volcanic dome at the Sierra crest: atmospheric rivers off the Pacific can deliver metres in a single cycle, and the 3,369 m summit holds it into summer.
Reading Mammoth Mountain like a forecaster
The number that matters most at Mammoth Mountain is the difference between the base (2424 m) and the summit (3369 m): when the freezing level sits between the two, the mountain is split into rain or wet snow below and dry snow above. The Ski Meter reads the model at both elevations and scores the day with every point accounted for; the full report adds hourly timing, accumulation ranges and confidence tags so you can decide when to travel, not just whether.