A tire can have most of its original tread depth remaining, look visually clean, and still be unsafe to drive on. Rubber doesn’t just wear down from the road. It degrades from oxygen, UV exposure, heat, and time, regardless of how many miles it has traveled. A spare that spent years in a garage, or a set of tires on a seasonal car driven only on weekends, can look new and still be past the point of reliable service.
The only reliable way to know how old a tire is: read the DOT date code stamped on the sidewall. The last four digits of that code give the week and year of manufacture. A tire marked “2419” was made in week 24 of 2019, making it 7 years old as of 2026. Many tire and vehicle manufacturers use 6 to 10 years as a tire age guideline, regardless of tread depth. Some OEMs, including Ford and Chrysler, specify 6 years in their owner’s manuals; others, including several tire brands, cite 10 years as the outer limit.
Checking tire age takes about two minutes per tire once you know where to look.
Quick Safety Answer
Find the DOT code on each tire’s sidewall. Start with the visible outer side, but remember that the complete DOT code may appear only on the inner side of the tire. The sequence starts with “DOT” followed by letters and numbers. The last four digits are the date code: the first two represent the week of manufacture (01 through 52), the last two represent the year. A code of 2419 means week 24 of 2019. Many tire and vehicle manufacturers use 6 to 10 years as a tire age guideline. A tire that is 6 years old should be inspected more carefully, especially before highway driving or long trips. A tire that is 10 years old or older should not be trusted for normal driving, even if the tread still looks usable. If you must move the vehicle, keep it to a short, low-speed drive to a tire shop, unless the tire has cracks, bulges, exposed cords, vibration, or air loss. Check the spare using the same method: it ages by date too, regardless of whether it has ever been used.
Why Tire Age Matters
Rubber oxidizes over time. The process accelerates with heat, UV exposure, and contact with ground-level ozone. As the rubber compound hardens and loses flexibility, small cracks develop in the tire’s inner structure, in the belt package, the carcass plies, and the inner liner, where no visual inspection from outside the car can find them. A tire with this kind of internal degradation can fail under stress that a younger tire would handle without difficulty.
Tread depth gauges don’t catch this. Research on tire aging links degradation of the inner structure to sudden failure, even when tread depth remains well above replacement thresholds. Spare tires on SUVs and pickup trucks are a particularly common example: they go unused for years and are often forgotten entirely when the vehicle changes ownership.
Safety Checklist
| Level | Items |
|---|---|
| Essential | Read the DOT date code on all four tires and the spare. Know the age of each tire. A tire aged 10 years or older has surpassed the guideline used by most tire and vehicle manufacturers: replace before normal use. |
| Better | Inspect sidewalls for cracking or surface checking. Record manufacture dates for each tire. Flag tires over 6 years for annual professional inspection. |
| Optional | Note storage history for rarely-used vehicles. Check the owner’s manual for the manufacturer’s own age limit, which may be stricter than 10 years. |
- All four tires checked. Locate the DOT code on each tire’s sidewall, starting with the outward-facing side. If the full code is only on the inner side and you cannot read it safely with a flashlight, ask a tire shop to check it during inspection. Do not crawl under a vehicle supported only by a jack. Record the 4-digit date code for each tire position.
- Spare checked. Full-sized spares age by date too, even if they have never touched the road. Storage conditions can slow or accelerate visible aging, but they do not stop rubber degradation. Compact spares (“donuts”) follow the same rule, but check the spare’s own DOT code: it may carry a different manufacture date than the other four.
- Tires under 6 years old. Normal service. Follow regular rotation and tire pressure schedules.
- Tires 6 to 10 years old. Have a tire shop inspect them annually. Ask the shop to assess the carcass condition rather than just tread depth.
- Tires 10 years old or older. Past the age guideline used by most tire and vehicle manufacturers. Have it assessed by a tire professional before any road use, and replace it before resuming normal driving.
- Sidewall cracking visible. Small surface texture is normal. Actual cracks, visible lines that run deeper than the surface pattern, indicate oxidation and structural risk. Replace immediately regardless of the tire’s age.
- Bulges or deformations present. Any bulge, blister, or asymmetric shape on the sidewall or tread area means the internal structure has already failed at that point. The tire is unsafe for any use.
- Vehicle stored or rarely driven. Tires on classic cars, seasonal vehicles, and trailers age faster due to extended stationary periods and UV exposure. Check age and condition before returning the vehicle to regular service after any extended storage period.
What To Do Before Driving
- Find the DOT code on each tire’s sidewall. The sequence begins with the letters “DOT.” Start with the outward-facing side. On some tires, the complete code appears only on the inboard side; if it’s not visible from outside, try a flashlight from below. If the code is still not readable, ask a tire shop to check it during inspection.
- Locate the last four digits of the DOT sequence. Ignore the letters and numbers before them: those identify the manufacturing plant and tire specifications, not the date.
- Read the first two of the four digits. That is the week of manufacture, numbered 01 through 52. Week 24 falls around mid-June.
- Read the last two of the four digits. That is the year. “19” means 2019. For tires made before 2000, the date code had only three digits. Any three-digit code means the tire is at minimum 26 years old and must be replaced.
- Calculate the tire’s age. Subtract the manufacture year from 2026. A tire with code 2419 is 7 years old this year. A tire with code 1615 was made in week 16 of 2015 and is now 11 years old, past the 10-year guideline used by most manufacturers.
- Flag any tire at 6 years or older. Schedule a professional inspection at a tire shop. Mention the tire’s age when booking so the shop assesses the carcass condition, not just tread depth.
- Act on any tire at 10 years or older. Most tire and vehicle manufacturers use 10 years as the outer age guideline, regardless of tread depth or visual condition. Have it inspected before any normal road use. If it shows cracks, bulges, or air loss, do not drive on it at all.
- Repeat for the spare. The spare has its own DOT code and its own age. Do not assume it matches the other four.
Can a 2012 Tire Still Be Used in 2026?
A tire with a DOT date code ending in 2012 was made in the 20th week of 2012. In 2026, that tire is 14 years old. Even if the tread looks adequate and the sidewall appears clean, it has surpassed the 10-year age guideline used by most tire and vehicle manufacturers. A tire in that condition should be replaced before normal driving.
When Not To Drive
- Avoid highway or extended driving on any tire that is 10 years old or older. If the vehicle needs to move, limit it to a short, low-speed trip to a tire shop for assessment.
- Do not drive if any tire shows sidewall cracks that go deeper than surface texture.
- Do not drive if any tire has a visible bulge, blister, or asymmetric shape anywhere on the sidewall or tread area.
- Do not drive if the vehicle has been in storage for more than two years and you have not confirmed the age and condition of each tire.
- Do not rely on a tire with a missing or completely illegible DOT date code for normal driving until a tire shop has inspected it and confirmed its age and condition.
- Do not drive if a tire has been stored flat or under a static load for a year or more without being inspected first by a tire professional.
- Do not continue a highway trip on a spare aged 10 years or older, even if it was never previously used. Use it only to reach the nearest tire shop.
Common Mistakes
- Trusting tread depth alone. A tread depth gauge measures wear, not age-related structural degradation. A tire with substantial tread remaining can still be 12 years old. Many quick-lube shops check tread depth and stop there.
- Forgetting the spare. The spare spends its entire life in the trunk or under the vehicle, never driven, never checked. Mechanics and buyers routinely find spare tires over 10 years old on vehicles changing hands, many with adequate tread and no visible damage.
- Assuming low-mileage tires are like new. A tire from a low-usage vehicle is not comparable to a new tire. Age accumulates from the manufacture date, not from when driving began. A tire that sat in a warehouse for four years before being sold is already four years old at installation.
- Counting the age limit from first use. Manufacturers count age from the DOT manufacture date, not from the day the tire was mounted or sold. A tire made in 2018 and installed in 2021 is 8 years old in 2026, not 5.
- Checking only the outward-facing sidewall. Some tires print the complete DOT code only on the inboard side. Checking only the visible face can mean missing the date code entirely, or reading an incomplete sequence with fewer than four trailing digits.
- Replacing only the two worn tires. When two tires wear out but the remaining two are old, replacing only the worn pair leaves aged rubber on one axle. Check the manufacture date of the remaining two: if they are at or past 6 years, replace all four at the same time.
Use This Checklist For
This tire age checklist is useful before a long trip, when buying a used car, when inspecting a low-mileage vehicle, or when checking a spare tire that has not been used for years.
