Mammoth Mountain 7-Day Snow Forecast

Mammoth Mountain Long-Range Snow Forecast Updated today

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Updated 20 October 2026 00:49 NZDT

Long-Range Snow Forecast for Mammoth Mountain

Long-range (14 to 45 days) from 19 October.

For Forecast detail, see below.

Mammoth Mountain Snow Forecast Highlights

When will there be fresh snow in Mammoth Mountain?

Mammoth Mountain Snow Forecast Highlights - GFS
Snowfall prediction at mid-mountain (2,885m)
Next Snow Expected	22 October
Next Snow Amount	3cm
Next 48 Hours	-
Next 7 Days	3cm

Long-range Snow Outlook for Mammoth Mountain

Snowfall

Snow Line

Max 16℃
Min -2℃

4cm New Snow

Snow Line from 2,729m to resort level (2,400m).

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Mammoth Mountain Long-Range (2 weeks+) Snow Forecast Outlook

Note :- Mountain weather is extremely dynamic; the forecast below will change. Any forecast snow may move forward or back in the forecast, and predicted snowfall depths will be revised in subsequent updates.

16 Day Weather and Snow Forecast for Mammoth Mountain from OpenMeteo(GFS)
	Snow and Weather	Temp Town
Mon 19	Cloudy.	Max 12℃ Min 3℃
Tue 20	Cloudy.	Max 12℃ Min 2℃
Wed 21	Cloudy.	Max 11℃ Min 1℃
Thu 22	up to 4cm New Snow Light snow showers at altitude, light rain below. Snow Line from 2,729m to resort level (2,400m).	Max 6℃ Min 1℃
Fri 23	Clear sky.	Max 11℃ Min -2℃
Sat 24	Clear sky.	Max 14℃ Min -2℃
Sun 25	Clear sky.	Max 16℃ Min 1℃

This Snow Forecast for Mammoth Mountain, United States gives the predicted Snowfall and Freezing Levels for the next week.

The forecast snowfall depths given are the likely average accumulations for the Lower and Upper slopes. The actual snow depth in Mammoth Mountain, on any given piste or itinerary, may be dramatically different, particularly if the snowfall is accompanied by high winds and/or varying air temperatures.

Snow Forecasts beyond two days ahead are subject to significant change and variable reliability.

Mammoth Mountain Snow Forecast updated at 00:49 NZDT, next update expected imminently.

Ensemble forecast for Mammoth Mountain, USA at 2,400m

Daily Mean Temperature (yellow line is control)

Daily Total Precipitation (blue line is control)

What are Forecast Ensembles ? Multiple forecasts from running the same weather model with slightly different inputs. The prominent line (the 'control') is the model output from standard inputs, the thinner lines are the variations. Plotted together, they show a range of possible outcomes; the closer they are, the higher the confidence.

How to read Long Range Ensemble Forecasts

These forecasts are from ECMWF EC46, a long-range, low-resolution (area) model. They may not accurately reflect local conditions and should be read as area forecasts, indicating whether the coming weeks are likely to be warmer, colder, wetter, or drier than average.

What to look for?

Temperatures trending downward at the same time as precipitation spikes upward... means snow!

Lines close together indicate a high confidence, while wider spreads signal uncertainty.

United States Accommodation (Apartments, Chalets, Hotels) Map

Snow Forecast near Mammoth Mountain

Snow Forecasts for Ski Resorts near Mammoth Mountain
Ski Area	48 Hr	7 Day	Mo	Tu	We	Th	Fr	Sa	Su
June Mountain	-	5cm

How reliable is the snow in Mammoth Mountain?

Mammoth Mountain is known for its excellent snow reliability, with an average snowfall of over 400 inches annually. For the latest snow conditions and depth information, be sure to check J2Ski.

Off-Piste Safety in Mammoth Mountain

Before skiing or snowboarding off-piste in Mammoth Mountain, you must assess the local snow conditions. Always check the local Avalanche Risk Level and ski with appropriate safety equipment.