If you are buying, inspecting, or replacing tires, knowing how to check tire date code can reveal how old a tire really is.
The code is small, but it affects safety, performance, and whether a tire is still suitable for service.
What the Tire Date Code Tells You
The tire date code is part of the Department of Transportation, or DOT, marking on the sidewall.
It identifies when the tire was manufactured, which matters because rubber ages even if tread looks fine.
Most passenger tires use a four-digit date code.
The first two digits show the week of manufacture, and the last two digits show the year.
For example, a code ending in 1524 means the tire was made in the 15th week of 2024.
Where to Find the DOT Code
The DOT marking is molded into one sidewall of the tire.
In many cases, the full DOT sequence appears only on the outer sidewall or may face inward on a mounted tire.
Look for a sequence beginning with DOT followed by letters and numbers.
The full string can include the manufacturing plant, tire size, and optional codes, but the date code is the most important part for age.
- Check the outer sidewall first.
- If the full code is not visible, inspect the inner sidewall.
- Use a flashlight or phone camera to read small raised characters.
How to Check Tire Date Code Step by Step
1. Locate the DOT marking
Find the letters DOT stamped on the tire sidewall.
This marks the start of the tire identification code.
2. Find the last four digits
On modern passenger tires, the final four digits of the DOT sequence are the date code.
These digits identify the week and year of production.
3. Read the week and year
The first two digits indicate the week, from 01 through 52.
The last two digits indicate the year.
A code of 0825 means the tire was made in the 8th week of 2025.
4. Verify the tire type
If you are checking a trailer, light truck, or commercial tire, confirm whether it uses the same four-digit format.
Some specialty tires may have different markings or older code formats.
What If the Tire Has Only Three Digits?
Three-digit date codes are a sign of an older tire manufactured before 2000.
These tires should not be treated as current inventory for road use, because the code does not provide a complete modern year format.
If you see a three-digit code and the tire is in service, the tire is already decades old.
For safety reasons, age alone is enough reason to inspect it closely or replace it, depending on application and condition.
How Old Is Too Old for a Tire?
Tire age recommendations vary by vehicle use, storage conditions, and manufacturer guidance.
Many automakers and tire manufacturers advise careful inspection after about six years and replacement around 10 years, even if tread remains.
Heat, ultraviolet light, ozone, underinflation, and long periods of inactivity accelerate aging.
A tire stored indoors in stable conditions may age more slowly than one exposed to sun and weather, but the date code still matters.
- Inspect often after 6 years of age.
- Consider replacement by 10 years, even with good tread.
- Replace sooner if cracks, bulges, vibration, or dry rot appear.
Why the Tire Date Code Matters for Safety
Rubber compounds harden over time, which can reduce traction, flexibility, and resistance to heat buildup.
A tire with good tread depth can still have aging-related structural risks that are not obvious at a glance.
This is especially important for spare tires, RV tires, trailer tires, and vehicles that sit unused for long periods.
These applications often accumulate age faster than mileage, so the date code is a critical inspection point.
How to Compare Age When Buying Tires
When purchasing new or used tires, ask for the DOT date code before installation.
Reputable sellers should be able to show the code and explain the tire’s age.
For new tires, verify that all four tires are from a recent production period.
For used tires, age should be weighed alongside tread depth, sidewall condition, repair history, and uniform wear.
- Ask for the full DOT code before purchase.
- Check that all tires are from the same production window when possible.
- Avoid very old inventory, even if unused.
Do Tire Date Codes Affect Warranty or Recall Checks?
Yes.
The DOT code can help identify whether a tire is covered by a manufacturer recall or falls within a warranty period.
It is also useful when comparing tires across different production batches.
If you suspect a defect, the date code may be needed for documentation when contacting the tire maker, dealer, or insurer.
Keep a photo of the sidewall code for records, especially for fleet or seasonal vehicles.
Common Mistakes When Reading Tire Date Codes
One common mistake is reading the wrong digits.
The date code is usually the last four digits of the DOT marking, not the entire sequence.
Another mistake is assuming tread depth alone tells the whole story.
People also miss the code because it is only stamped on one sidewall.
If the tire is mounted outward on a vehicle, the code may be hidden from view until the wheel is turned or the tire is removed.
Quick Reference for Reading the Code
- DOT = federal tire identification marking.
- Last four digits = production week and year.
- Example 1224 = 12th week of 2024.
- Three-digit code = older pre-2000 tire.
- Hidden sidewall = common on mounted tires.
When to Have a Tire Professionally Inspected
If the tire date code shows the tire is approaching six years old, or if the tire has visible cracking, uneven wear, or vibration, a professional inspection is a smart next step.
A technician can assess internal damage, air retention, and overall serviceability.
This is also wise after curb impacts, pothole strikes, or long storage periods.
A tire may look acceptable from the outside while still having age-related deterioration that only a trained inspection can identify.
Learning how to check tire date code gives you a fast way to judge tire age before you buy, drive, or store a vehicle.
It is one of the simplest checks you can make, and one of the most useful for long-term safety.