Change your tires when the tread is worn down or when the season changes

You need new tires when the tread depth falls below 2/32 of an inch, or when you switch between winter and summer driving conditions. Most people also change tires seasonally — moving to winter tires before cold weather arrives and switching back to all-season or summer tires in spring. The exact timing depends on where you live, how much you drive, and the road conditions you encounter.

Worn tires lose grip on wet and icy roads, which increases your stopping distance and raises the risk of skidding. Seasonal tires are designed for the temperatures and conditions of their season, so using the wrong type can reduce traction even if the tread looks fine. Checking your tires regularly and understanding when to replace them helps keep you safe and can prevent costly repairs down the road.

Key Takeaways

  • Replace tires when tread depth reaches 2/32 of an inch, which you can check with a penny test or a tread depth gauge.
  • Winter tires should go on when temperatures consistently drop below 45°F, not just when snow falls, because cold air reduces tire grip.
  • Summer or all-season tires can go back on when spring temperatures stay above 45°F for several days in a row.
  • Tire age matters too — tires older than six to ten years should be inspected by a technician, even if the tread looks acceptable.
  • Uneven wear, bulges, cracks, or vibration while driving are signs of damage that require when ready replacement, regardless of tread depth.

How to measure tread depth yourself

The penny test is the simplest way to check if your tires are worn. Take a penny and insert it into the tread groove with Lincoln's head upside down and facing you. If you can see the top of Lincoln's head, your tread is too shallow and you need new tires. If the tread covers part of his head, you still have adequate grip.

For a more precise measurement, buy a tread depth gauge at an auto parts store for a few dollars. Press the gauge into the tread at several spots across each tire — the center, the inner edge, and the outer edge. Record the lowest reading. If any tire measures 2/32 of an inch or less, that tire needs to be replaced. Uneven wear across the tire (high in the center, low on the edges, or vice versa) signals an alignment problem that a mechanic should check.

Check your tires at least once a month and before long trips. Cold tires give a more accurate reading than warm ones, so measure in the morning or after the car has been parked for a few hours.

Winter tires versus all-season and summer tires

Winter tires have deeper tread and a rubber compound that stays flexible in cold temperatures, giving you better traction on snow and ice. All-season tires are a compromise — they work reasonably well in most conditions but are not optimized for extreme cold or heavy snow. Summer tires have shallower tread and harder rubber, which works well on warm, dry pavement but loses grip when temperatures drop.

The temperature threshold is 45°F, not the first snowfall. When the air temperature consistently stays below 45°F, winter tires outperform all-season tires even on dry pavement because the rubber compound grips better in the cold. If you live in a region where winter temperatures regularly drop below freezing, winter tires are worth the investment. If you rarely see snow but experience occasional cold snaps, all-season tires may be sufficient, though winter tires are still safer.

Switch to winter tires before the first major cold spell arrives, not after. By the time snow falls, tire shops are often backed up and you may have to wait days for an appointment. Plan to change tires in late fall, typically October or November depending on your location.

When to switch back to summer or all-season tires

Move back to summer or all-season tires once spring temperatures consistently stay above 45°F for several days. Winter tires wear faster on warm pavement, so keeping them on longer than necessary wastes money and reduces their lifespan. In most regions, this switch happens in April or May, but timing varies based on your local climate.

Before you store winter tires, clean them with soap and water and let them dry completely. Store them in a cool, dark place away from direct sunlight, heat sources, and ozone-producing equipment like furnaces. Proper storage extends the life of your tires and keeps them ready for next winter.

Signs of tire damage that require when ready replacement

Do not wait for tread depth to reach 2/32 of an inch if you notice any of these warning signs. A bulge or blister on the sidewall means the tire's internal structure is failing and could blow out. Cracks in the tread or sidewall, especially if they are deep or spreading, indicate the tire is deteriorating. A vibration or thumping sensation while driving, particularly at highway speeds, often signals a damaged tire or wheel balance problem.

Uneven wear patterns also point to underlying issues. If the center of the tire is worn but the edges are not, your tires are overinflated. If the edges are worn but the center is not, they are underinflated. If wear is concentrated on one side, your wheels may be out of alignment. Have a mechanic inspect the problem and correct it, or the new tires will wear the same way.

If you hit a pothole, run over a sharp object, or suspect you have damaged a tire, pull over safely and inspect it. If you see a puncture larger than 1/4 inch, a bulge, or any visible damage, do not drive on that tire. Call for roadside information or drive slowly to the nearest tire shop.

How tire age affects safety

Even if the tread looks fine, tires degrade over time as the rubber oxidizes and loses flexibility. Most tire manufacturers recommend replacing tires that are six years old, and many insurance companies and safety organizations suggest replacement by ten years old, regardless of tread depth. The age is stamped on the sidewall in a four-digit code — the first two digits are the week and the last two are the year. For example, 3519 means the tire was made in week 35 of 2019.

If you buy used tires, check the age code before purchasing. A used tire that is already five years old will only give you one or two years of safe use before age becomes a factor. If you store your car for long periods or drive very little, your tires may age out before the tread wears down.

Tire pressure and its connection to wear

Proper tire pressure affects how quickly tires wear and how well they grip the road. Underinflated tires flex more, generate heat, and wear faster on the edges. Overinflated tires wear faster in the center and provide less traction. Check your tire pressure at least once a month using a pressure gauge — the correct pressure is listed on a sticker inside the driver's door jamb, not on the tire itself.

Tire pressure changes with temperature. In cold weather, pressure drops as the air inside the tire contracts. In hot weather, it rises. Check pressure when tires are cold — in the morning or after the car has been parked for several hours — for the most accurate reading. If pressure is low, add air at a gas station or tire shop. If it is consistently low, you may have a slow leak that a technician should inspect.

Frequently Asked Questions

How much does it cost to replace four tires?

Cost varies widely based on tire quality and size. Budget tires may cost $50 to $100 per tire, while premium brands run $150 to $300 or more per tire. Installation, balancing, and disposal fees typically add $15 to $50 per tire. A full set of four tires usually costs between $400 and $1,200 total, depending on your vehicle and the tires you choose.

Can I replace just two tires instead of four?

You can replace two tires if only two are worn, but install them on the rear axle to maintain stability. New tires have better traction than worn ones, and putting them in the front can cause the rear to slide during hard braking. If your vehicle is all-wheel drive, replacing just two tires may damage the transmission because the new tires will rotate at a different speed than the worn ones. Ask your mechanic whether your vehicle can safely use a partial replacement.

What should I do with old tires?

Most tire shops will dispose of your old tires when you buy new ones, usually for a small fee per tire. Some shops include disposal in the price. You can also take old tires to a recycling center or scrap yard. Do not leave tires in the trash or on the roadside, as they are difficult to decompose and can collect water, creating breeding grounds for mosquitoes.

Do I need winter tires if I have all-wheel drive?

All-wheel drive helps you accelerate and climb hills in snow, but it does not improve braking or cornering. Winter tires are about traction and stopping distance, not just getting moving. All-wheel drive with all-season tires is less safe than front-wheel drive with winter tires. If you live where winter temperatures drop below 45°F regularly, winter tires are worth the investment even with all-wheel drive.

How do I know if my tires are balanced?

Unbalanced tires cause vibration or a thumping sensation, especially at highway speeds. The vibration may be felt in the steering wheel, the seat, or the whole car. If you notice this, have a tire shop balance your tires. Balancing costs $15 to $50 per tire and takes about an hour. Proper balance extends tire life and improves fuel economy.