DOT date codes and tire age
The last four digits of a tire’s DOT code show when it was made. The first two digits are the week and the last two are the year, so 2424 would mean the 24th week of 2024. Tire age matters alongside tread depth.
Last updated: October 8, 2026
What “DOT” means here
US-bound tires carry a Department of Transportation identification sequence. Toward the end of that sequence is a four-digit date code on tires made in recent decades: the first two digits are the week (01–52/53), the last two are the year.
Example for illustration only: 2424 would indicate the 24th week of 2024. Always read the actual sidewall on the tire in front of you.
Quick check: type your four digits into our free DOT date code decoder to see the exact week and the tire’s age today.
Why age matters
- Rubber compounds change over time with heat, UV, ozone, and storage conditions
- A tire can look “new” in tread depth yet be older inventory
- Vehicle manufacturers and tire makers publish guidance on inspection and replacement intervals — follow those sources
Practical shopping tips
Ask the retailer for the date codes on the specific set you will receive. Prefer transparent sellers who will confirm week/year before mounting. Storage history also matters; a licensed installer can help inspect for cracking, flat-spotting, and other issues.
We do not set a universal “must replace by” age on this site. Use OEM guidance, tire-manufacturer guidance, and professional inspection.
Sources
Outbound links to public references. We paraphrase; visit the source for full wording and updates.
- NHTSA — Tires (TireWise) — Public guidance on tire inflation, the Tire and Loading Information label/placard, maintenance, and UTQG consumer grades.
- NHTSA — Safety and savings ride on your tires — Overview of why tire maintenance and labeling matter for everyday drivers.
- USTMA — Tire care & safety — Trade-association hub for passenger/light-truck tire care topics for consumers.
Also see
When to replace tires. Retailer links coming soon.