With the first cold snaps arriving in November, one question comes up in every Toronto household with a car: do I need winter tires in Ontario, and when should I put them on? The short answer is that winter tires are not legally required in Ontario, but there are good safety and financial reasons to use them, and the rules change the moment you drive into Quebec. This guide explains what the law says, how the Ontario winter tire insurance discount works, when GTA drivers should switch and what to look for when buying.

Are winter tires mandatory in Ontario?

No. Ontario does not require passenger vehicles to use winter tires. You can legally drive all year on all-season tires, as long as they are in good condition with adequate tread. That is different from Quebec, where winter tires are compulsory for part of the year, and from British Columbia, where winter-rated tires are required on many highways during the colder months.

However, legal is not the same as safe. All-season tires are a compromise: their rubber compound stiffens in the cold, which reduces grip on cold pavement, slush and ice. Winter tires use a softer compound and a tread pattern designed to bite into snow and channel slush, which helps with braking and cornering in typical GTA winter conditions.

The 7 degree rule of thumb

Tire makers and safety organizations commonly suggest switching once daytime temperatures consistently stay around 7°C or lower. In the Toronto area, that usually means sometime in November, though some years it is earlier or later. Don’t wait for the first big snowfall: tire shops across the GTA get booked up quickly once snow is in the forecast.

The Ontario winter tire insurance discount

Since January 1, 2016, auto insurers in Ontario have been required to offer a discount to drivers who install winter tires. The rule does not set one fixed percentage, so the discount varies by insurer. It is generally modest, often a few percent of your premium, but it can help offset the cost of tires over several seasons.

To get the discount, keep these points in mind:

• Tell your insurer: the discount is not automatic. Call your insurer or broker and confirm you have winter tires installed.
• Install them for the season: insurers typically require winter tires on all four wheels for a defined period, often from late fall to spring. Ask for the exact dates in your policy.
• Use proper winter tires: insurers generally expect tires marked with the three-peak mountain and snowflake symbol, not just all-season tires.
• Keep your receipt: your insurer may ask for proof of purchase or installation.

Driving to Quebec? The rules are different

If you regularly drive to Montreal, Ottawa-Gatineau or the Laurentians, it is worth knowing Quebec’s rules. In Quebec, winter tires are mandatory from December 1 to March 15 for passenger vehicles registered in the province, and those tires must carry the three-peak mountain and snowflake pictogram. The obligation applies to Quebec-registered vehicles, so an Ontario-plated car is not covered by the rule, but road conditions in Quebec in the middle of winter are a strong argument for winter tires anyway. The official details are available from the Société de l’assurance automobile du Québec (SAAQ).

Winter tires vs all-season vs all-weather

Many GTA drivers now consider a third option: all-weather tires, which carry the mountain-snowflake symbol but can be used year-round. Here is how the main options compare:

If you drive mostly downtown and can leave the car at home on storm days, all-weather tires may be a reasonable compromise. If you commute on the 401, the DVP or rural roads in York, Durham or Halton Region, dedicated winter tires offer the best margin of safety.

Buying and maintaining winter tires

A few practical tips can save money and stress:

• Look for the symbol: the three-peak mountain and snowflake pictogram on the sidewall indicates a tire that meets a recognized snow traction standard.
• Consider a second set of rims: mounting winter tires on their own wheels makes seasonal swaps faster and cheaper, and protects the tire bead.
• Check pressure often: tire pressure drops as temperatures fall, so check it monthly when tires are cold.
• Watch the tread: worn winter tires lose much of their snow grip, so have the tread checked each fall.
• Store them properly: keep off-season tires in a cool, dry place away from sunlight. Many GTA tire shops offer storage for a seasonal fee if you live in a condo.

Transport Canada also publishes general vehicle and tire safety information on its official website, which is worth reviewing before winter.

Getting ready for winter in Toronto

Tires are only one part of winter driving. Toronto’s winter parking rules and snow-route restrictions can catch drivers off guard, so read our guide to Toronto parking rules, tickets and permits. To understand how the city clears roads and sidewalks after a storm, see our explainer on snow clearing in Toronto. New drivers working through the licensing system can also check our Ontario driver’s licence guide before their first winter behind the wheel.

Winter tires FAQ

Are winter tires mandatory in Ontario?

No. Winter tires are not legally required in Ontario, but they are strongly recommended for safety in snow, slush and cold temperatures.

Do winter tires lower car insurance in Ontario?

Yes. Since 2016, Ontario insurers must offer a winter tire discount. The amount varies by insurer, and you usually need to tell them the tires are installed.

When should I put winter tires on in Toronto?

A common rule of thumb is when daytime temperatures stay around 7°C or lower, which in the GTA is usually in November.

Do I need winter tires to drive in Quebec with Ontario plates?

Quebec’s December 1 to March 15 requirement applies to Quebec-registered vehicles, but winter tires are still highly recommended for any winter trip to Quebec.