How to Winterize Your Car

Test the battery

Cold weather is brutal on batteries, and a weak battery often fails on the first freezing morning. Have it tested in the fall — most parts stores do it free — and replace it if it's near the end of its life. A strong battery is the single most important winter preparation.

Check the fluids

Before winter, check your coolant, oil, and washer fluid. Coolant should be a proper mix for freezing temperatures — many shops test its freeze point. Use winter washer fluid that won't freeze on the windshield. And make sure the oil is clean and at the right level for cold starts.

Inspect the tires

Tires are your connection to the road, and winter demands good tread. Check the tread depth, and consider winter tires if you regularly drive in snow and ice. At minimum, ensure your all-seasons have adequate tread and are properly inflated, since pressure drops in the cold.

Check wipers and defrosters

Visibility is everything in winter, so check your wiper blades and replace them if they streak. Make sure the front and rear defrosters work and that your heater is functioning. Clear windows and working defrosters are essential for safe winter driving.

Prepare the lights

Winter brings shorter days and more night driving, so check that all your lights work — headlights, brake lights, and turn signals. Cloudy headlights reduce visibility, so restore them if they've yellowed. Clean, bright lights help you see and be seen in dark, stormy weather.

Build a winter emergency kit

Every car should carry winter emergency gear: a blanket, warm gloves, a flashlight, jumper cables, and a phone charger. Add water, snacks, and a first-aid kit. If you're stranded in cold weather, these items keep you safe and warm while you wait for help.

Protect the paint and underbody

Road salt is corrosive, so winter is hard on your car's finish and underbody. A coat of wax in the fall protects the paint, and washing the car regularly — including the undercarriage — removes salt buildup. These steps prevent the rust that winter driving causes.

Plan for cold starts

Give your car a moment after starting in extreme cold before driving off, but don't idle for long — modern engines warm up faster while driving gently. Keep the gas tank at least half full in winter, which reduces condensation in the fuel system and ensures you have fuel if you're delayed.

Do it before the first storm

The key to winterizing is timing — do it in the fall, before the first cold snap, when it's still pleasant to work on the car. Waiting until a storm is forecast means scrambling, and shops book up fast once the snow flies. A little preparation now means a much safer, less stressful winter.

Stock the trunk for winter

Beyond the car itself, prepare your trunk for what winter can throw at you. A snow shovel, a bag of sand or cat litter for traction, an ice scraper, and a warm blanket all earn their place when the snow falls. These simple items turn a stuck situation into a manageable one.

Add a few bottles of water and some snacks, and you'll be comfortable even if you're delayed for hours. A little preparation in the trunk is cheap insurance against winter's surprises.

Check the cabin heat and defrost

Before winter, confirm your heater and defrosters work properly. A working defroster keeps your windshield clear, and cabin heat matters for both comfort and safety in the cold.