How to Read the Date Code on Cooper Tires: Overview and Key Facts

The date code on a Cooper tire is the final four digits of the full DOT Tire Identification Number (TIN). The first two digits identify the week of manufacture, and the last two identify the year, so “2322” means the tire was made during the 23rd week of 2022.

The difficult part is often locating the complete code, not interpreting the numbers. Cooper tires may show the full DOT marking on only one sidewall, while the opposite side may carry an abbreviated version without the four-digit date code. Dirt, mounting position, decorative sidewall lettering, and damage can also make the final digits easy to miss.

This guide explains where to look, how to separate the date code from the rest of the DOT marking, and how to read older or incomplete codes. It also covers tire age, replacement decisions, the limits of a manufacturing date, and when a tire professional should inspect the tire before it is driven. By the end, you can verify the production week and year, determine whether the code is readable, and decide what additional condition checks are necessary.

Where the Cooper Tire Date Code Appears

Look for a marking that begins with DOT on the tire sidewall. The DOT marking is the tire’s Tire Identification Number, which identifies manufacturing information and ends with the date code.

The date code is normally a four-digit group at the end of the TIN. It may appear after several groups of letters and numbers, and it is usually molded into the rubber rather than printed with ink.

For example, a Cooper sidewall might contain a sequence similar to:

DOT XXXX XXXX 2322

In this example, “2322” is the date code. The earlier characters are not the date and should not be used to calculate the tire’s age.

Check both sidewalls if the four-digit ending is not visible. Tire manufacturers commonly place the complete TIN on one sidewall and a shortened TIN on the other, allowing the tire to be identified without repeating the full date code on both sides.

On a tire mounted to a vehicle, the complete marking may face inward toward the suspension. A flashlight, phone camera, or inspection mirror can help, but do not place any part of your body under an unsupported vehicle to reach it. If the inner sidewall cannot be viewed safely, ask a tire shop to locate and read the code.

How to Decode the Four-Digit Number

Read the final four digits as two separate pairs:

• The first two digits indicate the week of manufacture.
• The last two digits indicate the year of manufacture.

A code ending in 0819 means the tire was manufactured in the eighth week of 2019. A code ending in 4523 means the tire was manufactured in the 45th week of 2023.

The code identifies the production period, not the date the tire was sold, installed, or first driven. A tire made in late 2022 could have remained in inventory before being purchased in 2023, so the manufacturing date and the in-service date may differ.

The week number normally ranges from 01 through 52, although some production calendars can involve a 53rd week. Do not treat the number as a month and day. For example, “1221” does not mean December 21; it means the 12th week of 2021.

Examples of Cooper tire date codes

• 1520: 15th week of 2020
• 4021: 40th week of 2021
• 0622: 6th week of 2022
• 5124: 51st week of 2024

Once the production week and year are known, compare that date with the current date to estimate the tire’s calendar age. The estimate is more useful when combined with the tire’s condition, storage history, mileage, inflation record, and exposure to heat or sunlight.

How to Find the Full DOT Marking

Start at the sidewall and search for the raised letters DOT. The characters may be near the bead area, close to the wheel, or among other molded markings. The code is not necessarily positioned next to the tire size or the word “Cooper.”

Follow the characters after DOT until you reach the final four digits. The complete TIN can include plant, size, and production-identification information before the date portion. Those groups may contain letters, numbers, or both, so avoid assuming that every group has the same meaning.

If you find “DOT” followed by several characters but no four-digit ending, inspect the opposite sidewall. A partial TIN may be molded on that side, while the full TIN—including the date code—is on the inward-facing side.

Clean only enough dirt or road film to make the raised markings visible. Use mild soap, water, and a soft brush if needed, and avoid aggressive scraping or grinding that could damage the sidewall. Do not use a code from a different tire on the vehicle; each tire has its own production marking.

A photograph can make the characters easier to enlarge, especially when the code is close to the rim. Make sure the image includes the entire sequence after DOT so that a smudged or misread digit can be compared with the surrounding markings.

What the Other DOT Characters Mean

The date code is only one part of the TIN. The characters before it can identify the manufacturing plant and describe tire characteristics or production information, depending on the format used for the tire.

For most owners, those earlier characters are less important than the final four digits. They should still be recorded when contacting Cooper, a tire dealer, or an installer about a warranty, recall, or product question because the full TIN can help identify the specific tire.

Do not confuse the TIN with other sidewall information, including:

• Tire size: A marking such as 225/65R17 describes width, aspect ratio, construction, and wheel diameter.
• Load and speed rating: These indicate rated carrying capacity and maximum speed category under specified conditions.
• UTQG markings: Treadwear, traction, and temperature grades are performance classifications, not production dates.
• Maximum pressure or load: These are tire-sidewall limits and are not the vehicle’s recommended cold inflation pressure.

The date code is identifiable because it is the final four-digit group in the full DOT/TIN sequence. A four-digit number elsewhere on the sidewall is not automatically a date code.

Older Cooper Tires and Three-Digit Codes

Tires manufactured before the current four-digit date format may have a three-digit date code. That older format used the first two digits for the production week and the final digit for the year within the decade, which makes the decade impossible to determine from the code alone.

For example, “238” could refer to the 23rd week of a year ending in 8, but the marking by itself does not establish which decade. Some older tires used an additional symbol to distinguish the 1990s from the 1980s, but interpretation can still be uncertain without more information about the tire.

A three-digit code indicates that the tire is far beyond the age range normally considered suitable for continued highway service. Do not put an old tire back into service merely because the tread appears deep or the sidewall looks acceptable. A tire dealer can confirm the marking and recommend a safe next step.

Most tires encountered in current vehicle service have a four-digit date code. If the number appears incomplete, damaged, or inconsistent with the tire’s apparent age, treat it as an identification problem rather than guessing.

What the Date Code Can—and Cannot—Tell You

The code tells you when the tire was manufactured. It does not prove that the tire is safe, unused, properly stored, correctly installed, or free from internal damage.

Age can contribute to rubber hardening, cracking, reduced flexibility, and loss of performance. Heat, ultraviolet exposure, underinflation, overloading, long periods of sitting, and improper storage can accelerate deterioration. Conversely, a newer tire can still be unsafe if it has been punctured, damaged by a road impact, run severely underinflated, or mounted incorrectly.

Inspect the tire for visible warning signs such as:

• Cracks in the sidewall, shoulder, or between tread blocks
• Bulges, bubbles, cuts, punctures, or exposed cords
• Uneven or unusually rapid tread wear
• Vibration, pulling, or repeated loss of air pressure
• Objects embedded in the tread or evidence of impact damage

Look beyond the tread depth. A tire may have legally measurable tread remaining while its sidewall or internal structure has deteriorated. Any unusual vibration, bulge, air loss, or suspected structural damage warrants prompt professional inspection.

Using the Date to Estimate Tire Age

To estimate age, identify the week and year in the four-digit code, then compare the manufacturing period with today’s date. A tire made in the first week of a year is nearly a full year older than one made in the final week of the same numbered year, so an age estimate should account for the production week rather than only the calendar year.

The date is especially useful when buying used tires, checking a vehicle that has been stored, evaluating a spare tire, or comparing the ages of tires installed as a set. Tires on the same vehicle may have different production dates if they were replaced at different times.

Do not use the date code alone to set a guaranteed replacement date. Tire life depends on storage and service conditions, and recommendations can vary by manufacturer and application. Follow the vehicle owner’s manual, Cooper’s current guidance for the specific tire, and the advice of a qualified tire professional.

As a practical safety measure, have older tires inspected more carefully and do not delay replacement when age-related cracking or other damage is present. If the tire’s age is well beyond the period recommended by the manufacturer, replacement is generally the safer choice even when tread remains.

Reading the Code on a Mounted Tire

Turn the steering wheel to improve access to the front tire, but do not rely on steering movement to expose the complete code. The full TIN may still be on the inner sidewall, and rear tires can be difficult to view without lifting equipment.

Never crawl under a vehicle supported only by a jack. If the tire must be removed to read the code, use appropriate lifting and support equipment or have a professional remove it. Removing a tire from a wheel is a separate procedure that requires specialized equipment and should not be attempted with improvised tools.

When inspecting a mounted tire, also verify that the code belongs to the tire you are examining. Record the tire position—front left, rear right, or another location—if comparing multiple tires. This prevents mixing up production dates during a replacement or rotation decision.

FAQ: Reading Cooper Tire Date Codes

Where is the date code on a Cooper tire?

The date code is the final four digits of the full DOT Tire Identification Number. Find “DOT” on the sidewall and follow the marking to its ending four-digit group. If that group is missing, check the opposite sidewall because the complete TIN may be visible on only one side.

How do you read the date code on Cooper tires?

Read the first two digits as the production week and the last two as the production year. For example, a code ending in 3422 identifies a tire made during the 34th week of 2022. The number is not a month-and-day date.

Does the DOT code show when a Cooper tire was

No, the DOT code shows when the tire was manufactured. It does not show the sale date, installation date, or date the tire first touched the road. Keep purchase or installation records separately when tracking service history.

Why can’t I find four numbers after DOT?

The complete date code may be on the tire’s opposite sidewall. Manufacturers can use a full TIN on one side and a shortened marking on the other. If neither side has a readable four-digit ending, dirt, sidewall damage, mounting position, or an older tire format may be responsible.

What does a three-digit Cooper tire date code mean?

A three-digit code is an older date format with an uncertain decade. The first two digits indicate the week, but the final digit identifies only the year’s last digit. Because such a tire is extremely old by current standards, have it evaluated and do not drive on it if its age or condition cannot be verified.

Can a tire with good tread still be too old?

Yes, tread depth alone does not establish tire safety. Rubber and internal components can deteriorate with age and environmental exposure even when tread remains. Inspect for cracking, bulges, air loss, and other damage, and follow the tire manufacturer’s age guidance.

Should all four Cooper tires have the same date code?

No, tires installed at different times may have different production dates. Compare each tire individually, especially after a replacement, rotation, used-tire purchase, or vehicle transfer. Differences in age are not automatically a defect, but they should be considered with condition and service history.

Conclusion: Confirm the Code, Then Check the Tire

To read a Cooper tire’s date code, locate the full DOT marking and interpret its final four digits as production week followed by year. The main limitation is that the code gives age, not a complete safety assessment; tread, sidewall condition, inflation history, damage, and storage also matter.

Record the code from each tire, inspect for visible defects, and ask a qualified tire professional to verify any unclear marking or questionable tire before driving.