Free tire age checker

Tire date code checker how old is this tire?

Type the DOT tire identification number, or just its last four digits, to see when the tire was made and how old it is, with what NHTSA and tire makers say about older tires.

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Examples to try

The TIN follows the letters DOT, near the rim. The full code is required on only one sidewall, so you may need to look at both sides. The example codes are made up.

Made in-
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Age-
Date code-

In short

The last four digits of a tire's DOT code are the week and year it was made: 2319 means week 23 of 2019, the week of June 9 to 15, 2019. Week 01 is the first full Sunday-to-Saturday week of the year (49 CFR 574.5). Tires made before July 2000 have three digits, so 329 could be 1999 or 1989.

How it works

How to use the Tire Date Code Checker

1

Find the DOT code

It follows the letters DOT near the rim. The full code may be on one side only.

2

Type it in

The whole code or just the last 4 digits (3 on tires made before July 2000).

3

Read the age

The week and year, the dates of that week, the age in years and months, and the TIN format.

What it does

What the tire date code checker works out

Week and year

From the 4-digit date code, with the Sunday-to-Saturday dates of that week.

Tire age

Years and months as of today, or any date you pick.

Pre-2000 codes

Three-digit codes, with both possible decades.

TIN format check

Says whether a full code is the 13-symbol current format, the older format or a retread code.

Typo check

Flags impossible weeks, future dates and letters that aren't used in TINs.

Date code
Last 4 digits: week (01-53) + last two digits of the year
Week 01
The first full calendar week, Sunday to Saturday (49 CFR 574.5(b)(3))
Before July 2000
3 digits: week + last digit of the year
TIN length
13 symbols for new tires (3-symbol plant code) since April 13, 2025; 7 for retreads
Age guidance
NHTSA: some makers say replace at 6 to 10 years; Bridgestone: over 10 years
FAQ

Questions about the tire date code checker

How do I read the date on a tire?
Find the DOT code on the sidewall and read the last four digits. The first two are the week and the last two the year: 2319 is week 23 of 2019. NHTSA's example: 0308 is the third week of 2008.
Did the DOT code change in 2025?
The plant code did. Since April 13, 2025, new tires must use a three-symbol plant code, giving a 13-symbol TIN; before that, tire makers could keep their old two-symbol codes. The date is still the last four digits, in the same week-and-year format.
How old is too old for a tire?
NHTSA says some vehicle and tire makers recommend replacing tires that are six to 10 years old, regardless of treadwear. Bridgestone and Firestone recommend inspection after 5 years in service and replacing tires more than 10 years old, spares included. The vehicle's owner's manual may say more.
Can I tell a tire's age by looking at it?
No. NHTSA says you can't detect tire aging just by looking. A tire that looks new can be old, which is why the date code matters, especially on spares and vehicles that sit.
What if the code has only three digits at the end?
The tire was made before July 2000. The first two digits are the week and the last is the year's last digit, so 329 is week 32 of 1999 or 1989. Either way, it's over 25 years old.
Keep going

Guides and features for this

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Sources

Where the formulas and rules come from

Checked October 2026. Age guidance is quoted from its source; there's no single age limit to apply to every tire.

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