SR-18 Road Conditions
Rim of the World - Crestline to Big Bear
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Driving SR-18 to Big Bear
Highway 18, also known as the Rim of the World Drive, is one of the most scenic mountain highways in Southern California. It connects Crestline and Lake Arrowhead to Big Bear Lake at elevations above 6,000 feet, making chain controls common during winter storms.
Chain Control Locations
Know Before You Go
- Sharp switchbacks between Crestline and Lake Arrowhead can ice over quickly
- The stretch near Running Springs sees heavy congestion during storms
- Black ice forms on shaded sections in the early morning hours
- Weekend traffic from Los Angeles can add 2-3 hours during ski season
Frequently Asked Questions
Do I need chains to drive to Big Bear on Highway 18?
During winter storms, Caltrans implements chain controls on SR-18 at various points. During R1, AWD/4WD with snow tires can proceed without chains. During R2, only AWD/4WD with snow tires on all four wheels is exempt. During R3, ALL vehicles need chains. Check the live status at the top of this page.
Is Highway 18 or Highway 330 better to Big Bear?
Highway 330 from Highland is the faster, more direct route to Big Bear via Running Springs. Highway 18 from Crestline is more scenic but windier and slower. During storms, one may be open while the other is closed. Check both routes before deciding.
How long does it take to drive Highway 18 to Big Bear?
From San Bernardino, expect about 1.5 hours in clear conditions via SR-330 to SR-18. The SR-18 segment from Crestline to Big Bear is about 30 miles of mountain driving. During chain controls or heavy traffic, travel time can double or triple.
Winter Driving Guide for SR-18 Rim of the World
The Rim of the World Drive is a stunning but challenging mountain road that demands respect in winter conditions.
What to Expect on Highway 18
SR-18 winds along the ridgeline of the San Bernardino Mountains with steep drop-offs and tight curves. Winter storms can bring significant snowfall above 6,000 feet, and the road is frequently subject to chain controls. The highway is narrower than the main approach via SR-330 and can be slower to clear after storms.
Chain Control Checkpoints
Caltrans sets up chain checkpoints along SR-18, typically near Crestline and Running Springs. Officers verify your vehicle has appropriate traction devices before allowing passage.
Chain Requirements
- R1: Chains required except for vehicles with snow tires or AWD/4WD. You must carry chains.
- R2: Chains required except AWD/4WD with snow tires on all four wheels.
- R3: Chains required on ALL vehicles, no exceptions.
Tips for Big Bear Trips
- Leave Early: Weekend traffic from LA starts building by 7 AM. Leave before 6 AM for the smoothest drive.
- Check All Routes: SR-330 and SR-38 are alternatives. If one is closed, another may be open.
- Fuel Up Below: Gas is significantly more expensive in Big Bear. Fill up in San Bernardino or Redlands.
- Pack Chains Even with AWD: R3 controls mean everyone needs chains, regardless of vehicle type.