Is There A Manufacturing Date On Tires? | Read The DOT Code

Yes, tire sidewalls show a DOT date code; the last four digits give the week and year the tire was made.

The date is on the tire, but it usually is not written in plain words. Instead, you get a DOT code molded into the sidewall, and the last four digits tell you when that tire was built.

That code matters when you’re buying new tires, checking a spare, or sizing up a used car. Tread depth tells one part of the story. Age tells another. A tire can look fine at a glance and still be older than you expect.

Where The Date Appears On A Tire

The manufacturing date sits inside the tire identification number, often called the DOT code. You’ll see “DOT” followed by a string of letters and numbers on the sidewall. On tires sold in the United States, the last four digits show the build date.

Those digits are easy to read once you know the pattern:

• The first two digits show the production week.
• The last two digits show the year.
• A code ending in 3520 means the 35th week of 2020.

So yes, there is a manufacturing date on tires. It just appears in code form instead of a plain calendar stamp.

How The Week And Year Work

NHTSA says week “01” starts with the first full calendar week of the year, and that week runs from Sunday through Saturday. A tire ending in 1223 came from the 12th week of 2023. A tire ending in 4819 came from the 48th week of 2019.

Manufacturing Date On Tires And The DOT Code

The full DOT string may appear on only one sidewall. The other side may show only a partial code. If you can’t find the four-digit date on the outer side, turn the steering wheel, roll the car a bit, or check the inner side.

That’s why shoppers sometimes miss the age of a “new” tire. A tire can be unused and still have spent a while in storage. That does not make it bad by itself, but it does make the date worth checking before you buy.

What The Date Does And Does Not Tell You

The date tells you when the tire was built. It does not tell you, on its own, whether the tire is still fit for service. Heat, sunlight, inflation habits, storage, load, and mileage all shape tire life too.

That’s why age should sit next to tread depth, cracking, vibration, bulges, and uneven wear in your check. Age gives you a clean starting point, and it keeps you from guessing. If a tire has a fresh-looking tread pattern but an older build date, you have a prompt to inspect more closely instead of trusting looks alone.

According to the NHTSA Tire Buyers’ FAQ, the last four digits of the tire identification number show the week and year the tire was made, and the agency says to check both sides because the full code may not appear on each sidewall.

Michelin’s tire replacement guidance says tire age should be judged with wear and condition, yearly checks should start after five years of use, and replacement should happen after ten years as a precaution.

Why A New-Looking Tire Can Still Be Old

Rubber changes over time. A tire stored in a warehouse may age more slowly than one sitting in harsh sun, but the clock still runs. That’s why the date code matters when you’re buying a spare, shopping clearance stock, or checking the tires on a used car.

If you’re buying from a shop, the code also gives you a calm way to ask better questions. You can ask when the tire arrived, how it was stored, and whether the set was made around the same time. If you’re checking a used car, date gaps across the four tires can hint at piecemeal replacements after punctures, curb damage, or uneven wear.

Sidewall Mark Or Situation	What It Means	What To Do
DOT code ends in 3520	Made in week 35 of 2020	Count age from that week
DOT visible, but no four-digit date	You may be seeing the partial sidewall marking	Check the opposite side
Brand-new tire with old date	Unused stock can still age in storage	Ask about storage time
Spare tire with deep tread	Low use does not stop aging	Read the spare’s code too
Used car with mixed tire dates	Not all four tires were installed together	Check each tire one by one
Older date, decent tread	Age and wear are separate checks	Judge both
Cracks near an older date code	Age may be catching up with the tire	Book an inspection
No readable DOT code	The marking may be dirty or worn	Clean and inspect again

When Tire Age Starts To Matter More

You don’t need to panic over every tire that isn’t fresh from the mold. Still, age deserves closer attention in a few common situations:

• Your spare has never touched the road.
• The car sits for long stretches.
• You drive in hard heat.
• The tire shows sidewall cracking or hardening.
• You bought a used vehicle and don’t know the tire history.
• You found tires that have been in stock for a long time.

In those cases, the date code helps you sort sales talk from facts. It also tells you when a shop check makes sense before daily driving or a long trip. Even one older tire in an otherwise newer set is worth noting, since mixed ages can change how the car feels under braking, in rain, and during emergency moves.

Tire Age	What To Check	Reason
0 to 3 years	Tread, pressure, damage	Age is only one piece of the picture
4 to 5 years	Date, tread, cracking, ride feel	Older stock or rough use starts to matter more
After 5 years in service	Yearly professional inspection	Brand guidance gets tighter here
Approaching 10 years from build date	Plan for replacement	Many tire makers treat this as the outer limit
Any age with cracks, bulges, or vibration	Immediate shop check	Condition can overrule age alone

A Simple Tire-Date Check You Can Do At Home

You can check all four tires and the spare in less than ten minutes.

1. Turn the steering wheel so the front sidewall is easier to read.
2. Find the letters “DOT” on the tire.
3. Scan to the last four digits of the full code.
4. Read the first two digits as the week and the last two as the year.
5. Write each code down and compare all five tires.
6. Check for cracks, bulges, odd wear, and mismatched dates.

If the rear tire date is hard to see, crouch lower, use a flashlight, or move the car slightly. Dirt can hide the code too, so a quick wipe helps. On a used car lot, that ten-minute check can tell you more than a sales sticker ever will.

Mistakes That Trip People Up

Most mix-ups come from the same few habits:

• Reading a partial DOT code and thinking the date is missing.
• Using the purchase receipt date instead of the build date.
• Checking only the front tires and skipping the spare.
• Thinking deep tread means the tire is still young.
• Assuming all four tires were made at the same time.

If you read an old forum thread, you may see talk of three-digit date codes. That belongs to much older tires. On current passenger tires, the four-digit week-and-year code is the format you want.

When An Older Date Should Push You To Act

Use the date to start the check, then pair it with the tire’s condition and how the car feels on the road. If a tire is older, cracked, vibrating, or wearing in a strange pattern, ask a tire shop for an inspection. That gives you a cleaner answer than tread depth alone.