Big Mountain 7-Day Snow Forecast

Big Mountain Long-Range Snow Forecast Updated today

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Updated 20 September 2026 22:41 PDT

Long-Range Snow Forecast for Big Mountain

Long-range (14 to 45 days) from 21 September.

For Forecast detail, see below.

Big Mountain Snow Forecast Highlights

When will there be fresh snow in Big Mountain?

Big Mountain Snow Forecast Highlights - GFS
Snowfall prediction at mid-mountain (5,741ft)
Next Snow Expected	21 September
Next Snow Amount	1in
Next 48 Hours	1in
Next 7 Days	7in

Long-range Snow Outlook for Big Mountain

Snowfall

Snow Line

Max 36°F
Min 21°F

8in New Snow

Snow Line from 5,541ft to resort level (4,495ft).

Big 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 Big Mountain from OpenMeteo(GFS)
	Snow and Weather	Temp Town
Mon 21	1in New Snow Snow. Snow falling to resort level (4,495ft).	Max 28°F Min 24°F
Tue 22	Cloudy.	Max 30°F Min 24°F
Wed 23	Clear sky.	Max 31°F Min 21°F
Thu 24	Cloudy.	Max 36°F Min 22°F
Fri 25	up to 5in New Snow Light snow. Snow Line from 5,541ft to resort level (4,495ft).	Max 33°F Min 30°F
Sat 26	up to 2in New Snow Light snow. Snow falling to resort level (4,495ft).	Max 32°F Min 29°F
Sun 27	New Snow Cloudy. Snow falling to resort level (4,495ft).	Max 33°F Min 28°F

This Snow Forecast for Big 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 Big Mountain, on any given trail 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.

Big Mountain Snow Forecast updated at 22:41 PDT, next update expected 04:00 PDT.

Ensemble forecast for Big Mountain, USA at 4,495ft

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.

Snow Reliability

Big Mountain typically enjoys reliable snow conditions, with an average annual snowfall of around 300 inches. Check J2Ski for the latest snow depth and conditions to plan your visit.

Off-Piste Safety in Big Mountain

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