Storm Drops Snow Across California Mountain Ranges
A fresh winter storm brings significant snowfall to Mammoth Mountain and Big Bear as an advisory remains in effect.
Updated on Oct. 22, 2026 in Current Conditions
Live Poll
Do you feel extreme weather events are becoming more disruptive in your local area?
A powerful storm system is moving through California, depositing up to 6 inches of snow at Mammoth Mountain. Officials have issued a Winter Weather Advisory for parts of the Eastern Sierra Nevada as the region faces wintry conditions and thunderstorms in southern valleys.
Why it matters
The incoming weather highlights the onset of the winter season, directly impacting travel and recreational preparedness across the state's mountainous terrain. The shifting conditions mark a notable transition as the state moves toward early-season resort openings.
Mammoth Mountain recorded 4 to 6 inches of snowfall, while areas to the south expect accumulations between 2 and 4 inches. The storm continues to impact the region stretching from the Mammoth area down to Lake Isabella.
The players
Mammoth Mountain
This major ski resort and mountain peak in the Eastern Sierra Nevada is a primary hub for winter sports and recreational tourism in California.
Big Bear
Located in the San Bernardino Mountains, this area is a popular destination for Southern California residents seeking mountain weather and winter activities.
The details
The storm is currently active across the Eastern Sierra Nevada, with snow reported in Big Bear and thunderstorms developing in the valleys and foothills of Southern California. A Winter Weather Advisory remains active for the area through Thursday evening before drier conditions arrive.
Timeline
A Winter Weather Advisory remains in effect until 5 p.m. on October 22, 2026.
The storm system is expected to exit the region on the evening of October 22, 2026.
Drier and sunnier weather is forecast to begin across the region on October 23, 2026.
Opening Day at Mammoth Mountain is scheduled for November 13, 2026.
Seasonal Patterns
The current weather event follows the established thresholds set by the National Weather Service's Winter Weather Advisory criteria for managing hazards in mountain regions. This snowfall aligns with the expected start of early winter weather patterns across the Sierra Nevada.
Drivers in the Eastern Sierra Nevada should adhere to all Winter Weather Advisory guidelines and prepare for potentially hazardous travel conditions through Thursday. Those planning mountain activities should monitor local alerts for updates as the storm exits the region.
The takeaway
Early-season snow serves as a reminder to check vehicle readiness and travel advisories before heading into high-elevation areas. Residents should prepare for the return of drier conditions by Friday while keeping track of resort announcements for the coming season.
What happens next
Mammoth Mountain is scheduled to hold its official Opening Day on November 13, 2026.
Further reading
For more updates on regional weather impacts, visit the Current Conditions page.
Live Poll
Do you feel extreme weather events are becoming more disruptive in your local area?
