Quebec — mandatory
December 1 to March 15, every year. All four tires must bear the 3-peak mountain snowflake (3PMSF) symbol. Fine: $200–$300 per offence.
Required by law in some provinces, strongly recommended everywhere else — and they can cut your insurance bill. What to buy, when to buy, and where.
Updated October 2026 · 7 min read
Canada has no federal winter tire law. Two provinces have their own rules; everywhere else it's your decision — but the safety case is strong.
December 1 to March 15, every year. All four tires must bear the 3-peak mountain snowflake (3PMSF) symbol. Fine: $200–$300 per offence.
October 1 to April 30 on mountain passes and designated highways (Sea to Sky, Malahat). Fine: $121. Elsewhere in BC: recommended.
No law, but swap when daytime temperatures drop below 7°C. Below that, all-season rubber hardens and braking distances grow fast.
Ontario: insurers must give you a 2–5% discount for running winter tires (law since 2016). On a $2,000 premium, that's up to $100 back every year — just for telling your insurer.
A set of four costs roughly $400–$1,000 and lasts 4–6 winters. The insurance discount alone can pay for the set over its life — and splitting mileage between two sets makes both last longer.
In Quebec the math is even simpler: a single $200–$300 fine buys most of a set.
Look for the three-peak mountain snowflake on the sidewall. It's the legal standard in Quebec and the real winter standard everywhere. “M+S” (mud and snow) alone is not a winter tire.
Dedicated winter: best grip below −10°C. All-weather (3PMSF, usable year-round): the practical compromise — legal in Quebec, no seasonal swap. All-season: fine above 7°C, outmatched in real winter.
Two winters on the drive axle with all-seasons on the other end is the most dangerous setup — the car can spin under braking. It also fails Quebec's law.
Three quick checks — age, tread, damage. A minute, no tools needed.
Find “DOT” on the sidewall. The last four digits are the birth week and year: 3521 means week 35 of 2021.
Slide to your shallowest groove. New winter tires start around 10–11 mm.
Quick test: push a quarter into the tread, caribou nose down. If you can see the top of the nose, you're under ~4 mm — start shopping.
Cracks in the sidewall, bulges, uneven wear, or old puncture repairs?
My first winter set in Canada was used — and it worked out. But used tires hide their age and history. Run this checklist before you pay:
Consistently among the cheapest for big brands (Michelin, Bridgestone), and installation — mounting, balancing, nitrogen, rotations — is included in the price. Membership required. (No affiliate — direct link.)
Costco Tires (No Affiliate)Also worth checking:
October to early November: best selection, shortest shop waits, and fall manufacturer rebates (often $60–$100 back on a set of four). After the first big snowfall, prices rise and garages book out for weeks.
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