Severe winter storm hits California: Chain requirements and travel advisory through March 17th, 2025
A severe winter storm is bringing heavy snow and high winds to California, triggering chain requirements on key mountain routes.
A powerful winter storm is sweeping across California, bringing heavy snowfall, high winds, and hazardous driving conditions to mountainous regions. The National Weather Service has issued a Winter Storm Warning, urging travelers to exercise extreme caution, particularly in the Sierra Nevada, where snowfall totals could exceed several feet.
Winter Storm Impact and Travel Advisory
Blizzard-like conditions are expected in higher elevations, with wind gusts reaching up to 60 mph. Major highways, including Interstate 80 and U.S. Route 50, may experience closures or chain requirements as Caltrans works to maintain road safety.
Check current driving conditions and advisories on the CalTrans' QuickMap.
Caltrans officials have emphasized the importance of preparedness, reminding drivers that chain controls will be enforced in affected areas. Those traveling into the mountains should expect delays and plan accordingly.
California Chain Requirements for 2025
With the storm intensifying, understanding California's 2025 chain requirements is essential for safe winter travel. Caltrans uses a three-tiered system to determine when chains are necessary:
- Requirement 1 (R-1): Chains are required on all vehicles except those under 6,000 pounds with snow tires. Vehicles towing trailers must use chains.
- Requirement 2 (R-2): Chains or traction devices are required on all vehicles, except four-wheel or all-wheel drive vehicles with snow-tread tires on all four wheels. However, chains must still be carried.
- Requirement 3 (R-3): Chains or traction devices are mandatory for all vehicles, without exception—often leading to highway closures.
Pat Sharyon
For a detailed guide on California’s winter driving rules and chain requirements, visit our Winter Driving Guide.
Safety Recommendations for Travelers
Drivers should take the following precautions:
- Carry chains even if you have a four-wheel drive vehicle.
- Drive cautiously—speed limits in chain control areas are reduced to 25-30 mph.
- Check road conditions before departing using the Caltrans Quickmap or calling 800-427-7623.
- Install chains properly—use designated chain installation areas and, if needed, independent chain installers (who must provide a receipt).
- Monitor the forecast—weather conditions can change rapidly.
Truck and Trailer Specifics
Commercial drivers and those towing trailers should be aware of specific chaining requirements:
- Semi-trailers must have chains on at least one axle.
- Trucks using super single tires must have chains on all drive wheels.
- Trailers with brakes must have chains on at least one axle.
Stay Informed and Travel Safely
With this severe winter storm creating dangerous conditions, preparedness is key. Always carry chains, check weather updates, and follow Caltrans advisories.
Stay safe and drive cautiously as this storm progresses.
Mac Douglass
Mac Douglass
