OpenSnow prides itself on providing credible and accurate mountain weather forecasts, while also being transparent about our mistakes.

We looked back at the 5-day snow forecast from January 1, 2026, to compare against how much snow fell through Monday, January 5, 2026, at popular ski resorts with reliable snow reporting data.

The result? We under-forecasted by 6% against the total snowfall.

This was the second significant storm cycle with every OpenSnow forecast powered by PEAKS.

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Palisades Tahoe

Palisades Tahoe 5-Day Snow Forecast = 31-54 inches

Palisades Tahoe 5-Day Snow Report = 44 inches

5-Day Snow Forecast Accuracy: 100%

Sierra-at-Tahoe

Sierra-at-Tahoe 5-Day Snow Forecast = 28-49 inches

Sierra-at-Tahoe 5-Day Snow Report = 34 inches

5-Day Snow Forecast Accuracy: 100%

Mammoth

Mammoth 5-Day Snow Forecast = 36-62 inches

Mammoth 5-Day Snow Report = 50 inches

5-Day Snow Forecast Accuracy: 100%

Whitefish

Whitefish 5-Day Snow Forecast = 7-14 inches

Whitefish 5-Day Snow Report = 8 inches

5-Day Snow Forecast Accuracy: 100%

Sun Valley

Sun Valley 5-Day Snow Forecast = 5-16 inches

Sun Valley 5-Day Snow Report = 14 inches

5-Day Snow Forecast Accuracy: 100%

Brundage

Brundage 5-Day Snow Forecast = 19-36 inches

Brundage 5-Day Snow Report = 20 inches

5-Day Snow Forecast Accuracy: 100%

Grand Targhee

Grand Targhee 5-Day Snow Forecast = 15-33 inches

Grand Targhee 5-Day Snow Report = 29 inches

5-Day Snow Forecast Accuracy: 100%

Alta

Alta 5-Day Snow Forecast = 25-46 inches

Alta 5-Day Snow Report = 42 inches

5-Day Snow Forecast Accuracy: 100%

Park City

Park City 5-Day Snow Forecast = 12-24 inches

Park City 5-Day Snow Report = 31 inches

5-Day Snow Forecast Accuracy: 7 inches under-forecasted

Steamboat

Steamboat 5-Day Snow Forecast = 12-24 inches

Steamboat 5-Day Snow Report = 14 inches

5-Day Snow Forecast Accuracy: 100%

Vail

Vail 5-Day Snow Forecast = 3-9 inches

Vail 5-Day Snow Report = 9 inches

5-Day Snow Forecast Accuracy: 100%

Crested Butte

Crested Butte 5-Day Snow Forecast = 6-16 inches

Crested Butte 5-Day Snow Report = 14 inches

5-Day Snow Forecast Accuracy: 100%

Monarch

Monarch 5-Day Snow Forecast = 3-10 inches

Monarch 5-Day Snow Report = 7 inches

5-Day Snow Forecast Accuracy: 100%

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Adding up these ski resort 5-day snow forecasts from January 1, 2026, and comparing them against the 5-day snow report as of Tuesday, January 6, 2026, we under-forecasted by 6% or scored 94% against the forecast.

• January 1, 2026, 5-Day Total Snow Forecast: 202-393 inches (297 inches)
• January 6, 2026, 5-Day Total Snow Report: 316 inches
• 5-Day Snow Forecast Accuracy: 94% or 6% under-forecasted

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Questions? Send an email to [email protected], and we'd be more than happy to take a look at the snow forecast for a particular ski resort and compare it against what fell and/or against another weather app.

Sam Collentine