How Long Is a TDG Certificate Valid in Canada?

The law answers this one itself, in a single sentence with two numbers. Here is exactly what the Regulations say, what happens when the date arrives, and the one bridge that keeps you working.

What the Regulations say, word for word

People ask this question expecting a complicated answer. It is one of the shortest rules in the entire TDG framework, and because the exact wording matters, here it is straight from the source:

Why the shorter clock for air? Shipping dangerous goods by aircraft carries higher immediate risk, so the retraining cycle is tighter. If your work touches both ground and air shipments, the air date arrives first, and that is the one to track.

Note the clock starts on the date of issuance, the day your employer signs the certificate, not the day you finished your course. Which raises the next question: what exactly has to appear on that certificate?

The expiry date on the certificate itself

The expiry date is not optional fine print. The Regulations require it on the face of the certificate, introduced by exact words so an inspector can find it in one glance:

The Regulations also use the word valid in a specific way: to recognize certain documents as training certificates, such as a US document that "is a valid training certificate for the purposes of these Regulations when that document is valid in the United States" (Section 6.4). The practical takeaway for a Canadian worker stays the same: the date on your certificate, counted from issuance, is the whole story.

What happens when your certificate expires

The day after the expiry date, your right to handle, offer for transport, or transport dangerous goods on your own ends. Section 6.1 requires anyone doing that work to be adequately trained and hold a training certificate in accordance with Part 6, present tense, currently.

Getting back to work takes two steps:

• Refresh the training. Complete a course again, or have your employer formally assess your existing knowledge. Transport Canada's training bulletin describes the statement of experience route: "The statement is prepared when the training certificate expires so the employer can issue a new one to his employee."
• Get the new certificate issued. Your employer signs a new certificate once they have reasonable grounds to believe you are adequately trained. Self-employed? You issue your own, same standard.

The renewal course is the same as the first time, and most people finish faster the second time. Before you pay for anything, take the free TDG practice test. If you score above the pass mark, you are one short course away from a fresh certificate.

"The expiry problem I see most is not people ignoring the date. It is people counting three years from the wrong day. The clock runs from the date your employer issued the certificate, not from the day you passed your course. Those can be weeks apart, and inspectors read the certificate, not your memory."

Samira AliCertified Public Health Inspector, 10+ years across Canada and the U.S.

The supervision bridge

Here is the relief valve almost nobody knows about. An expired certificate does not mean you go home. Section 6.1 gives a second lawful path:

Transport Canada's bulletin spells out what direct supervision means: "A person without training must be physically accompanied by a person who has adequate training and a valid training certificate." Physically accompanied. A trained coworker on the floor beside you counts. A supervisor watching a camera feed from another room does not.

Use the bridge as a bridge: it keeps the shift legal while your new certificate gets sorted, not as a permanent staffing plan.

Employer record-keeping after expiry

Employers, the file does not close when the certificate does:

For a road certificate, that is five years of paperwork per worker: 36 months of certificate life plus 24 months of retention. Build it into your filing system once, and it never bites you.

Is the rule changing?

Maybe eventually, not today. Transport Canada has been working toward competency-based training standards for Part 6, a model where a certificate of competency and formal employee evaluations would replace the current system. Those changes have appeared as proposals in the Canada Gazette, Part 1, which is the consultation stage, not law. As of August 2026, the rule in force is the one quoted at the top of this page: 36 months for road, rail, and vessel, 24 months for air, under Section 6.5. When Part 6 changes for real, this page gets updated the same week.

The short version

1. The Regulations state a training certificate expires 36 months after issuance for road, rail, and vessel transport (Section 6.5).
2. For aircraft, the Regulations set it at 24 months after issuance.
3. The clock runs from the issuance date signed by your employer, and the certificate must show the expiry date after the words Expires on.
4. After expiry: refresh the training, then your employer issues a new certificate. Self-employed workers issue their own.
5. Until the new one arrives, you can work under the direct physical supervision of someone who holds a current certificate.
6. Employers retain training records for 2 years after the expiry date.

This article is general information, not legal advice. Training requirements depend on your duties, the dangerous goods involved, and the mode of transport. Always verify against the current Transportation of Dangerous Goods Act, 1992 and Regulations.