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 December 23, 2025, to compare against how much snow fell through Sunday, December 28, 2025, at popular ski resorts with reliable snow reporting data.

The result? We under-forecasted by 17% against the total snowfall.

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

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Palisades Tahoe

Palisades Tahoe 5-Day Snow Forecast = 40-64 inches

Palisades Tahoe 5-Day Snow Report = 65 inches

5-Day Snow Forecast Accuracy: 1 inch under-forecasted

Mt. Rose

Mt. Rose 5-Day Snow Forecast = 20-40 inches

Mt. Rose 5-Day Snow Report = 58 inches

5-Day Snow Forecast Accuracy: 18 inches under-forecasted

Sierra-at-Tahoe

Sierra-at-Tahoe 5-Day Snow Forecast = 41-64 inches

Sierra-at-Tahoe 5-Day Snow Report = 62 inches

5-Day Snow Forecast Accuracy: 100%

Kirkwood

Kirkwood 5-Day Snow Forecast = 54-85 inches

Kirkwood 5-Day Snow Report = 60 inches

5-Day Snow Forecast Accuracy: 100%

Mammoth

Mammoth 5-Day Snow Forecast = 51-81 inches

Mammoth 5-Day Snow Report = 74 inches

5-Day Snow Forecast Accuracy: 100%

Sun Valley

Sun Valley 5-Day Snow Forecast = 11-23 inches

Sun Valley 5-Day Snow Report = 19 inches

5-Day Snow Forecast Accuracy: 100%

Jackson Hole

Jackson Hole 5-Day Snow Forecast = 7-18 inches

Jackson Hole 5-Day Snow Report = 25 inches

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

Grand Targhee

Grand Targhee 5-Day Snow Forecast = 9-20 inches

Grand Targhee 5-Day Snow Report = 25 inches

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

Alta

Alta 5-Day Snow Forecast = 15-27 inches

Alta 5-Day Snow Report = 16 inches

5-Day Snow Forecast Accuracy: 100%

Park City

Park City 5-Day Snow Forecast = 9-16 inches

Park City 5-Day Snow Report = 9 inches

5-Day Snow Forecast Accuracy: 100%

Powder Mountain

Powder Mountain 5-Day Snow Forecast = 8-16 inches

Powder Mountain 5-Day Snow Report = 9 inches

5-Day Snow Forecast Accuracy: 100%

Steamboat

Steamboat 5-Day Snow Forecast = 9-18 inches

Steamboat 5-Day Snow Report = 13 inches

5-Day Snow Forecast Accuracy: 100%

Copper Mountain

Copper Mountain 5-Day Snow Forecast = 0-5 inches

Copper Mountain 5-Day Snow Report = 7 inches

5-Day Snow Forecast Accuracy: 2 inches under-forecasted

Vail

Vail 5-Day Snow Forecast = 1-5 inches

Vail 5-Day Snow Report = 4 inches

5-Day Snow Forecast Accuracy: 100%

Crested Butte

Crested Butte 5-Day Snow Forecast = 4-12 inches

Crested Butte 5-Day Snow Report = 8 inches

5-Day Snow Forecast Accuracy: 100%

Whistler

Whistler 5-Day Snow Forecast = 12-22 inches

Whistler 5-Day Snow Report = 13 inches

5-Day Snow Forecast Accuracy: 100%

Kicking Horse

Kicking Horse 5-Day Snow Forecast = 7-17 inches

Kicking Horse 5-Day Snow Report = 22 inches

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

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Adding up these ski resort 5-day snow forecasts from December 23, 2025, and comparing them against the 5-day snow report as of Monday, December 29, 2025, we under-forecasted by 17% or scored 83% against the forecast.

• December 23, 2025, 5-Day Total Snow Forecast: 298-533 inches (406 inches)
• December 28, 2025, 5-Day Total Snow Report: 489 inches
• 5-Day Snow Forecast Accuracy: 83% or 17% 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