How to Check How Old Your Tires Are
Tires don't come with an expiration date stamped on the sidewall in plain English — but they do carry a manufacturing date code that tells you exactly when they were made. Knowing how to read it is one of the most straightforward things you can do to assess whether your tires are still safe to drive on.
Why Tire Age Matters
Rubber degrades over time, even when tires look fine and have plenty of tread remaining. Heat, UV exposure, and oxidation cause the rubber compounds to dry out and crack internally — a process called dry rot or rubber degradation. A tire that's been sitting in a garage or mounted on a vehicle that doesn't get driven much can look perfectly usable while already being structurally compromised.
Tread depth tells you how much rubber is left. Age tells you whether that rubber is still trustworthy. Both matter.
Where to Find the Tire's Date Code 🔍
Every tire sold in the United States is required to carry a DOT (Department of Transportation) code molded into the sidewall. This is a string of letters and numbers that begins with "DOT."
The last four digits of that string are the ones you're looking for. They encode the week and year the tire was manufactured:
- The first two digits = the week of the year (01 through 52)
- The last two digits = the year
Example: A DOT code ending in 2319 means the tire was made in the 23rd week of 2019 — roughly early June 2019.
A code ending in 0424 means the 4th week of 2024 — late January 2024.
The full DOT string might look something like: DOT U2LL LMLR 2319
Only the last four digits are the date. The characters before them identify the manufacturer, plant, and tire size — useful for recalls, but not for age-checking.
Where the Code Is Located on the Tire
The DOT code is molded into the sidewall, but it's not always on the outward-facing side. Many tires have the full DOT code on the inboard sidewall — the side facing the vehicle's undercarriage. You may need to crouch down and look toward the inside of the wheel to find the complete code.
Some tires show a partial DOT code on the outer sidewall. If the string doesn't end in four digits, you're looking at the abbreviated version. Check the other side.
How Old Is Too Old?
This is where general guidance exists, but no universal rule applies to every driver, vehicle, or climate.
Most tire manufacturers and safety organizations suggest considering tire replacement at 6 years, regardless of appearance, and treating 10 years as an absolute maximum — even if the tires look fine and still have tread.
Some vehicle manufacturers set their own recommendations. BMW, Ford, and others have historically recommended replacement at 6 years as a guideline. These numbers vary by manufacturer and are worth looking up in your owner's manual or the tire brand's documentation.
| Tire Age | General Guidance |
|---|---|
| Under 5 years | Typically considered within normal service life |
| 5–6 years | Inspect carefully; watch for cracking |
| 6–10 years | Replacement often recommended regardless of tread |
| Over 10 years | Broadly considered unsafe by most standards |
These are general reference points — not a substitute for a hands-on inspection.
Factors That Affect How Quickly Tires Age ⚠️
Two tires with the same manufacturing date can age very differently depending on:
- Climate: Hot, sunny climates (Arizona, Florida, Texas) accelerate rubber degradation. UV exposure and sustained heat break down rubber faster than moderate climates.
- Storage conditions: Tires stored outdoors, in direct sunlight, or in environments with ozone exposure (near electric motors or fluorescent lighting) degrade faster.
- Inflation history: Chronically under-inflated tires generate more heat during driving, which ages rubber faster.
- Usage patterns: A tire on a daily driver accumulates more heat cycles than one on a vehicle driven occasionally — but the opposite problem applies to tires that sit unused for extended periods.
- Spare tires: Full-size and compact spares are often forgotten and can easily exceed 10 years without ever being mounted. Age still applies.
What Tire Aging Looks Like Visually
Early-stage degradation can be subtle. Look for:
- Fine surface cracking on the sidewall, especially in the flex zones near the bead
- Crazing — a network of small cracks in the tread grooves
- Hardening — the rubber feels stiff rather than pliable
- Fading or discoloration on the sidewall
Visible cracking is a sign that the rubber is already compromised. But internal degradation can precede visible signs, which is why the date code matters even when tires look fine.
New Tires Aren't Always New
When buying replacement tires — especially through online retailers or discount shops — it's worth checking the DOT date code before installation. Tires can sit in a warehouse for a year or two before being sold. A "new" tire could already be two or three years old before it ever touches your car.
There's no rule saying a retailer must disclose tire age at point of sale, so this is something you'd need to check yourself or ask a shop to verify.
The Missing Piece
How old is too old for your specific tires depends on what you're driving, where you live, how the tires have been stored and used, and what your vehicle manufacturer recommends. The DOT code gives you the facts. What you do with them depends on your vehicle, your climate, and your situation.
