How to Read Tire Date Codes and Avoid Old Stock in Canada: 5 Critical Steps

Knowing how to read tire date codes and avoid old stock in Canada could save you from mounting rubber that’s already past its safe service life — even if it looks brand new. Every tire sold in North America carries a four-digit date stamp on its sidewall, yet fewer than three in ten Canadian drivers know how to find or interpret it . That knowledge gap matters because Canada has no federal law requiring retailers to disclose a tire’s manufacture date at the point of sale. Unlike Germany, where tires older than five years are flagged for consumers, Canadian shops can legally sell tires that have been sitting in warehouses for six, eight, or even ten years. Here’s how to protect yourself before you pay.

What Is a DOT Tire Date Code and Where to Find It on the Sidewall

Every tire manufactured for sale in North America must carry a Department of Transportation (DOT) identification number, stamped into the lower sidewall near the rim. The full DOT string includes plant codes and size identifiers, but the critical piece is the last four digits — the date code.

Look on the outward-facing sidewall first. If you only see a partial DOT string, check the inner sidewall; manufacturers are only required to mould the complete code on one side . The code is typically enclosed in a shallow rectangular border, making it easier to spot once you know what to look for.

Quick-find steps:

1. Crouch beside the tire so you’re eye-level with the sidewall.
2. Locate the letters “DOT” — they’ll be followed by a string of 10–12 characters.
3. Read the last four digits of that string. That’s your manufacture date.
4. If you see only three digits at the end, the tire was made before the year 2000 and should be replaced immediately.
5. If the full DOT code isn’t visible on the outer sidewall, slide your hand along the inner sidewall near the bead to find the complete stamp.

How to Decode the 4-Digit Date Stamp on Your Tires (With Examples)

The four-digit code is simpler than it looks. The first two digits represent the week of manufacture (01–52), and the last two digits represent the year.

Date Code	Week	Year	Manufactured
0823	08	2023	Late February 2023
2319	23	2019	Early June 2019
4721	47	2021	Late November 2021
0126	01	2026	First week of January 2026
3517	35	2017	Late August 2017

A tire stamped “2319” rolled off the production line in week 23 of 2019 — roughly early June. If you’re reading this in 2026, that tire is nearly seven years old, regardless of how much tread remains.

Pre-2000 tires used a three-digit code (e.g., “358” = week 35 of 1998). Some manufacturers added a triangle symbol after the code to indicate the 1990s decade. Any tire with a three-digit DOT code is well past retirement and should not be driven on under any circumstances.

A tire’s age starts the day it’s manufactured — not the day it’s installed on your vehicle. A “new” tire that sat in a warehouse for four years is already four years old when you buy it.

How Old Is Too Old? Manufacturer and Safety Guidelines for Tire Age

Rubber compounds degrade through a process called oxidation, even when a tire is never mounted. Heat, UV exposure, and humidity accelerate breakdown, but the chemistry happens regardless of storage conditions. In Canadian freeze-thaw cycles, aged rubber loses elasticity faster, which directly reduces wet and winter grip — exactly when you need it most.

Here’s what the major authorities recommend:

Authority	Recommendation
Michelin	Replace tires older than 10 years; inspect annually after 5 years
Continental	Replace after 10 years maximum, regardless of appearance
Bridgestone	Follow vehicle manufacturer guidance; retire after 10 years
NHTSA (U.S.)	No specific mandate, but advises checking manufacturer limits; notes most recommend 6–10 years
Transport Canada	No maximum age regulation for sale or use

Most tire engineers recommend the six-year rule as a practical safety margin: after six years from the manufacture date, have tires professionally inspected annually, and replace them outright at ten years. This applies even to full-tread spares sitting in your trunk. If you’re storing seasonal tires, proper storage practices can slow degradation — but they can’t stop the clock.

Why Canadian Retailers Can Legally Sell Old Tire Stock

Given those manufacturer guidelines, you might expect federal regulations to enforce them at the retail level. They don’t. Canada’s Motor Vehicle Safety Act sets performance standards for new tires through Canadian Motor Vehicle Safety Standards 119 and 139. These standards cover load ratings, speed ratings, tread-wear indicators, and labelling requirements. What they don’t cover is manufacture-date disclosure at the point of sale or a maximum shelf life for retail inventory .

This means a tire retailer in Canada is under no federal obligation to tell you when a tire was made. A set of all-seasons manufactured in 2020 can sit in a distribution warehouse until 2026 and be sold as “new” — because technically, they are. They’ve never been mounted. But six years of oxidation have altered the rubber compound in ways that no visual inspection can detect.

Provincial regulations add complexity. Quebec mandates winter tires from December 1 through March 15, creating a compressed fall buying window during which retailers are most likely to move older winter-tire inventory. If you encounter a dispute over tire age or quality, Quebec’s Office de la protection du consommateur (OPC) provides a formal complaint process. British Columbia requires winter tires or chains on most highways from October 1 to March 31, creating a similar seasonal demand spike. Ontario, Alberta, and other provinces have no winter-tire mandates, but consumer protection statutes may provide recourse if a retailer sells tires unfit for their intended purpose.

RIDEZ reviewed listings from three major Canadian online tire retailers in early 2026 and found inventory with manufacture dates ranging from 2021 to 2025 available at the same price point. None of the listings displayed the DOT date code. This is legal — and it’s exactly why you need to check yourself.

5 Essential Steps to Avoid Buying Aged Tires in Canada

Whether you’re buying from a dealership, a national chain, or an online marketplace, these steps will help you avoid paying full price for aged inventory.

1. Ask for the DOT date code before purchase. Request it in writing — email or text. If a retailer refuses to provide manufacture dates, consider that a red flag.
2. Set a personal maximum age. Buy tires manufactured within the last two years. This gives you the full useful life of the rubber compound. For tires you’ll keep through Canadian winters, freshness matters more than brand.
3. Inspect on delivery or installation. Before the technician mounts the tire, read the DOT code yourself. If the date is older than your threshold, reject the tire on the spot. Most reputable shops will swap without argument.
4. Check all four tires — plus the spare. It’s common for a set of four to include tires from different production batches. One outlier with a 2021 date code in a set of 2025 tires means uneven aging and grip differences across your axles. The spare in your trunk or under your truck bed ages at the same rate, so don’t forget it.
5. Document everything. Save your receipts with the DOT codes noted. If a tire fails prematurely, the manufacture date is critical for warranty claims. When ordering online, request tires manufactured within 18–24 months, and confirm the retailer’s return policy for aged stock.

For more Canadian-specific consumer protection guidance, RIDEZ publishes regularly on the gaps between what the law requires and what safe driving demands.

What to Do Next

• Right now: Walk out to your vehicle and read the last four digits of the DOT code on all four tires — plus the spare. Write them down.
• If any tire is over 6 years old: Book an inspection with a licensed tire technician. Ask specifically about sidewall cracking, rubber hardness, and tread-compound condition.
• If any tire is over 10 years old: Replace it. No inspection needed — the age alone is sufficient reason, per NHTSA and most manufacturer guidelines.
• Before your next tire purchase: Decide on a maximum acceptable age (RIDEZ recommends no older than 2 years from manufacture at time of purchase) and communicate it to the retailer in writing before you pay.
• Share this article with another Canadian driver. The more buyers who check DOT codes at the counter, the faster retailers will change their disclosure practices.

Understanding how to read tire date codes and avoid old stock in Canada isn’t difficult — it takes thirty seconds per tire. The harder part is accepting that a perfectly treaded, never-mounted tire can still be unsafe. Rubber ages whether it’s rolling or sitting on a shelf. In a country with no disclosure law and some of the harshest driving conditions in the world, that thirty-second check is the cheapest safety upgrade you’ll ever make.