How To Read Tire Date Of Manufacture | Avoid Costly Misreads

A tire’s build date sits in the last four digits of the DOT code: week first, year last.

Tire age can be easy to miss. Tread may still look decent. The sidewall may look clean at a glance. Yet the date stamped into the tire can tell you whether you’re dealing with a fresh set, an older spare, or a used-car tire that has been sitting around longer than you thought.

That’s why the tire date of manufacture matters. It gives you one fast way to size up what’s on the car before you judge tread depth, wear pattern, or price. Once you know where the code sits and how the numbers break down, you can read it in seconds.

This article walks you through the pattern, shows what the code means, and points out the mistakes people make when they read only part of the sidewall.

How To Read Tire Date Of Manufacture On The Sidewall

Start by finding the letters DOT on the tire sidewall. That DOT string is the Tire Identification Number, often called the TIN. It can look like a random mix of letters and numbers, though the part you care about most is at the end.

On tires made in 2000 or later, the last four digits tell you the date of manufacture. The first two digits show the production week. The last two digits show the year.

Say the code ends in 2319. That means the tire was made in the 23rd week of 2019. If it ends in 0824, it was built in the 8th week of 2024.

Where To Find The Full Code

This is where people get tripped up. Many tires show a partial DOT code on one sidewall and the full version on the other. If you only see DOT plus a few characters and no four-digit date at the end, check the inner sidewall too. The full date code may be there.

If the tire is mounted and the full code faces inward, you may need to turn the steering wheel, crawl beside the car, or use your phone camera with the flash on. On rear tires, you may need to look from under the vehicle or remove the wheel for a clean view.

How The Date Pattern Works

The week number runs from 01 through 52, and in some years you may also see 53. The year is shown with the last two digits only. So 1522 means week 15 of 2022. The code does not name the month. You get the week, then the year.

• 0118 = first week of 2018
• 3521 = 35th week of 2021
• 4923 = 49th week of 2023
• 0625 = sixth week of 2025

Once you know that pattern, you don’t need a chart for most tires. You only need to read the last four numbers in order.

What A Three-Digit Code Means

If you ever see a tire with only three digits at the end, that points to a tire made before 2000. Those old codes used two digits for the week and one digit for the year within a decade. That makes the exact year harder to pin down, and any tire from that era is already far beyond normal service life.

So if you spot a three-digit date code on a passenger vehicle tire, treat it as old stock that should not stay in service.

Reading The Tire Manufacture Date Without Guesswork

The cleanest way to read the code is to break it into two parts. Read the first pair as the week. Read the second pair as the year. Don’t try to turn it into a month, and don’t read the four digits as one whole number.

1. Find the DOT string.
2. Go to the last four digits.
3. Split them into two and two.
4. Read the first pair as the week number.
5. Read the second pair as the year.

That’s it. A tire ending in 4417 was built in week 44 of 2017. A tire ending in 1020 was built in week 10 of 2020. The code tells you when the tire was made, not when it was sold, installed, or first driven.

That last point matters. A tire can be sold months after it was built. That does not make it bad on its own. Tires often spend time in transit, storage, and warehouse inventory before they reach a shop. The date still matters because it gives you a starting point for judging age.

Ending Code	What It Means	What To Do Next
0124	Week 1 of 2024	Check tread, damage, and matching dates across all tires
1123	Week 11 of 2023	Fine for age checks; still inspect for wear and repairs
2522	Week 25 of 2022	Look for even wear and confirm correct tire pressure history
4019	Week 40 of 2019	Pay closer attention to cracks, flat spotting, and storage history
0718	Week 7 of 2018	Use age as one part of the replacement call, not the only part
5216	Week 52 of 2016	Check owner’s manual and tire maker service-life advice
2314	Week 23 of 2014	Inspect with extra care; age is now a bigger factor
378	Three-digit code from before 2000	Replace; this is old beyond normal road use

Why The Date Matters Even When Tread Looks Fine

Tires age from more than road wear. Heat, sunlight, storage conditions, inflation habits, load, and long periods of sitting all shape how the rubber holds up. That’s why a tire with decent tread can still deserve a hard second look if the manufacture date is old.

The federal TIN marking rule lays out how the date code is structured. The NHTSA tire buyers’ FAQ also tells shoppers to check the last four digits when buying tires. That alone should tell you the date is not a trivial detail.

Date still isn’t the only thing that matters. A newer tire with sidewall damage, a puncture near the shoulder, or chronic underinflation can be a worse bet than an older tire that has been stored and used well. The smart move is to read the date first, then judge the tire as a whole.

Cases Where Age Carries More Weight

Some situations call for more caution than others. A full-size spare tucked under an SUV can sit for years with little attention. An old camper trailer can roll on tires that look unused yet have aged in plain sight. A used car lot can also have cars wearing tires that still pass a quick tread glance while carrying a much older build date.

• Spare tires that rarely touch the road
• Vehicles parked for long stretches
• Trailers, campers, and seasonal vehicles
• Used cars with mixed tire ages
• Cars bought with “new” tires that were built long before sale

In those cases, the date code gives you a cleaner read on what you’re buying or driving.

Common Mistakes When Reading Tire Dates

The biggest mistake is reading the wrong numbers. Many drivers spot a long string on the sidewall and assume the whole DOT code is the date. It isn’t. Only the last four digits carry the week and year on modern tires.

The next mistake is stopping at the outer sidewall. If the full code is not there, the date may be facing inward. People then assume the tire has no readable date when the full code is sitting on the other side.

Another slip is turning the week into a month. A code ending in 1824 does not mean February 18, 2024, and it does not mean the 18th month of anything. It means week 18 of 2024.

Mistake	Why It Happens	Better Read
Using the whole DOT string as the date	The code looks like one long serial number	Read only the last four digits
Checking one sidewall only	The full TIN may face inward	Inspect both sides when needed
Reading week as month	Four digits look like a calendar date	Use week first, year last
Thinking sale date equals build date	Shoppers link purchase date to tire age	Use the sidewall code, not the receipt date
Ignoring old spares	They often look unworn	Check the spare with the road tires

A Five-Minute Tire Check You Can Do Today

If you want a fast routine, check all four road tires and the spare in one pass. Write the ending code for each tire on your phone. That lets you spot mismatched ages right away.

1. Park on level ground and turn the front wheels for a clearer sidewall view.
2. Find DOT on each tire.
3. Photograph the last four digits.
4. Compare all tires side by side.
5. Note any tire that is much older than the rest.
6. Then inspect tread depth, cracks, bulges, puncture repairs, and uneven wear.

If one tire is years older than the others, ask why. It may be a lone replacement after a flat, an old spare pressed into service, or a used tire installed to save money. That does not always mean the tire is unsafe. It does mean the set deserves a closer look.

Once you know how to read the code, you stop guessing. You can spot old stock while shopping, check a used car with more confidence, and keep an eye on the spare before it becomes a nasty surprise on the roadside.