Your vehicle is your lifeline during winter - and your biggest liability if it is not prepared. Heavy snow demands more than all-season tires and optimism.
Essential Vehicle Maintenance
Tires
Winter tires outperform all-season tires below 45°F, improving stopping distance by 25% or more on snow and ice. Check tread depth - 4/32 inch minimum, 6/32 inch recommended for winter driving. Verify tire pressure monthly; cold air reduces pressure.
Battery
Batteries lose capacity in cold weather. Have yours tested before winter. If it is more than three years old and struggles on cold mornings, replace it proactively.
Fluids
Use winter-grade washer fluid rated to -20°F or lower. Verify antifreeze concentration protects to your region's lowest expected temperature. Change oil according to manufacturer cold-weather specifications.
Wipers and Visibility
Install winter wiper blades. Clear all snow and ice from windows, mirrors, lights, and the roof before driving - roof snow slides onto windshields and creates hazards for vehicles behind you.
Emergency Kit for Your Car
- Blanket or sleeping bag
- Flashlight with extra batteries
- Shovel and ice scraper
- Jumper cables or portable jump starter
- Traction aids (sand, kitty litter, or traction mats)
- Water and non-perishable snacks
- Phone charger
- First aid kit
- Reflective vest and flares
Score your readiness with our Vehicle Winter Readiness Calculator.
Driving Technique in Heavy Snow
Accelerate and decelerate gradually. Increase following distance to 8 - 10 seconds. Avoid cruise control on slippery surfaces. If you skid, steer in the direction you want to travel without slamming brakes. Use our Braking Distance Calculator to understand stopping distances at your speed.
When Not to Drive
If our Driving Safety Calculator scores below 40, postpone non-essential trips. No destination is worth a collision on an icy road.
Vehicle Checks That Matter Before the First Flake
Winter readiness is more than a full tank. Confirm tire tread and cold-weather pressure, washer fluid rated for deep freezes, working headlights and brake lights, and a charged phone with a cable that fits your car. Pack gloves you can shovel in, a sturdy scraper, a compact shovel, and a reflective layer. Score remaining gaps with the Vehicle Winter Readiness tool before a heavy event arrives.
When travel is unavoidable, review the Driving Safety Calculator, Braking Distance Calculator, and Tire Grip Calculator. Clear every window and the roof so sliding snow slabs do not surprise you or the driver behind you. If ice is the larger threat, add the Black Ice Calculator to your pre-trip checklist.
Know When Not to Leave
A prepared car still cannot invent grip on untreated ice. If local officials urge travel bans, or your route includes untreated hills and bridges, staying home is the successful outcome. Tell someone your route only when you must drive, and choose main treated corridors over shortcuts through residential hills.
Commute Timing Without False Courage
Leaving earlier helps only when roads are treated. Leaving earlier onto untreated ice simply lengthens your exposure. Use the Commute Delay Calculator to plan buffers, then cancel if conditions worsen after you start. Keep following distance long enough that you can stop without ABS drama on packed snow.
Battery, Fluids, and Visibility Habits
Cold mornings punish weak batteries. If the engine cranks slowly above freezing, schedule a load test before the next cold snap. Top washer fluid that will not gel, and keep a spare jug in the cabin so you are not stuck with a frozen reservoir on a salted highway. Replace streaking wipers early; winter blades bend ice better than worn summer rubber.
After parking outside, crack the parking brake debate carefully on ice: some drivers prefer leaving the vehicle in gear or park without relying solely on a frozen brake. Follow your vehicle manual for cold climates. Before you roll, walk around the car once - buried exhaust pipes and snow-packed wheel wells create avoidable hazards.
After You Arrive
Brush snow off shoes before it melts into the cabin carpet, and leave a towel in the footwell during storm weeks. If you parallel-park on plow routes, know local rules for overnight bans so your prepared car is not ticketed or buried by a pass. Reassess the Commute Safety Score before the return trip; morning treatments can wear off by afternoon refreeze.