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Condition scores evaluate settled base depth, fresh powder accumulation, temperature preservation, and wind crust hazards in real-time.
Observation Freshness & Provenance
Why Conditions Currently Look Limited
7-Day Snow & Weather Forecast
High-resolution numerical weather prediction
Historical Climate Baselines & Normals
About Mammoth Pass (Eastern Sierra) Telemetry & Geography
At 9,300 feet above Mammoth Lakes, Mammoth Pass acts as a direct funnel for Pacific storms breaching the Sierra crest, building some of California's deepest and longest-lasting snowpack.
Season Normals & Recreation Windows
The typical winter season for this zone runs from November - June. Historically, peak snow depth averages approximately 98 inches, generally reached between late February and early April depending on elevation.
Official Avalanche Advisory Required (Eastern Sierra Avalanche Center)
FrostBurst condition ratings score snow depth and meteorological quality, NOT avalanche danger. Before backcountry skiing or mountain riding, you must check the official regional avalanche forecast and carry rescue gear (beacon, shovel, probe).
View Official Avalanche Center Forecast →Station & Telemetry Metadata
Station Geography
What is Snow Water Equivalent (SWE) and Why Does It Matter?
Snow depth tells you how high the snow reaches; Snow Water Equivalent (SWE) tells you how much water and mass is actually packed into that snow.
Read 6-min Guide →