Bronco Forge Team
Yes, you need to carry chains on a Ford Bronco heading to Big Bear in winter, even with 4WD. California law requires it from November through April, and whether you have to install them depends on conditions that change by the day.
In This Guide
Why 4WD Doesn't Get You Out of Carrying Chains
California treats carrying chains and installing chains as two separate rules. Every vehicle driving into a chain control zone during winter, four-wheel drive included, must have a set of chains in the vehicle from November through April.
Whether you have to put them on the tires is a different question, and it depends on the chain control level in effect that day, plus whether your tires meet the state's snow tire standard. A Bronco with 4WD can skip installing chains under some conditions, but it can never skip carrying them.
The Three Chain Control Levels Explained
Caltrans posts one of three levels during a storm. Under R-1, two-wheel-drive vehicles need chains or snow tires, while a 4WD Bronco with snow-rated tires on all four wheels is usually exempt from installing.
Under R-2, the level you'll see most often in Big Bear, that same 4WD exemption applies, but you still have to carry chains in the truck. Under R-3, every vehicle installs chains, no exceptions, 4WD or not.
The level can change during the same storm, so what applied on your drive up might not apply on the drive back down.
Do Your Tires Count as Snow Tires?
Not automatically. California Vehicle Code Section 605 sets the standard, and your tires need an M+S marking on the sidewall along with at least 6/32 of an inch of tread depth to qualify.
Some tires also carry a three-peak mountain snowflake symbol, which is a stricter winter rating than plain M+S. Check your Bronco's actual tire sidewall before you leave. Stock Sasquatch and Badlands tires don't all automatically clear the bar, and if yours don't, you're back to installing chains under R-2 conditions even with 4WD.
Where the Checkpoints Are
CHP sets up chain checkpoints on Highway 18 and Highway 330 during active storms, the two main routes most Fontana and Inland Empire drivers take up the mountain. Officers check for chains in the vehicle before letting you continue, not just installed on the tires.
Get caught without them when they're required and you can be turned around before you ever reach Big Bear Village. Check Caltrans QuickMap for the current chain control level before you leave, since it can change between when you check at home and when you reach the mountain.
What Kind of Chains to Buy
Buy chains sized to your actual tire, not your Bronco's trim level. Sasquatch Broncos run larger tires than Base or Big Bend trims, so a chain set sized for a smaller tire won't fit.
Test-fit them in your driveway before the trip. The first time you try to install a set of chains should never be at a checkpoint in the snow with traffic backed up behind you.
FAQ
Do I need chains if my Bronco has 4WD and Sasquatch?
You still need to carry chains in the vehicle at all times during winter months. Whether you have to install them depends on the current chain control level and whether your specific tires meet California's snow tire standard.
What months does California require chains for Big Bear?
The requirement runs November through April, though it only gets enforced during active storms and when a chain control level is actually posted.
What's the difference between R-1, R-2, and R-3?
R-1 requires chains or snow tires on 2WD vehicles only. R-2, the most common level in Big Bear, exempts 4WD vehicles with proper snow tires from installing but still requires carrying chains. R-3 requires chains on every vehicle with no exceptions.
Do factory all-terrain tires count as snow tires?
Only if they carry the M+S designation with enough tread depth. Look for the three-peak mountain snowflake symbol for the stricter rating, and check your specific tire's sidewall instead of assuming any all-terrain tire qualifies.
Can I get turned away from Big Bear without chains?
Yes. CHP checkpoints on Highway 18 and Highway 330 check for chains during active storms and can turn vehicles around before they reach town.
For the rest of your winter trip, from which route to take to what belongs in the truck, our full Big Bear winter prep guide covers it all.
