DOT Date Code: How Old Are Your Tires?

Every tire sold in the U.S. has a Tire Identification Number that starts with "DOT". Under federal rules (49 CFR 574.5), the last four digits are the week and year the tire was made.

Example: DOT 4B9X ABC 2319 → made in the 23rd week of 2019. Tires made before 2000 used a 3-digit code.

The full code may be printed on only one side of the tire, so check both sides.

Why tire age matters

Rubber ages over time, even on tires with plenty of tread or ones that are rarely used, such as spares. NHTSA notes that heat speeds up tire aging. There is no federal expiration date. Many vehicle and tire makers recommend replacement at 6 to 10 years from the manufacture date, regardless of tread, so check your owner's manual and the tire maker's guidance.

When buying tires

Check the DOT date on new tires at installation. You may want tires that were made recently.

Related guides

• When to Replace Your Tires
• How to Read a Tire Sidewall Size Code
• Tire FAQ

General information only, not a substitute for an in-person inspection by a qualified tire professional. If in doubt, have your tires checked.

Sources

• 49 CFR 571.139 & 574.5 (eCFR) – tire labeling / DOT code
• NHTSA – Tire Aging
• NHTSA – TireWise / Tire Safety brochure (DOT HS 811 151)

Last updated October 28, 2026.