When to Install Winter Tires in Ontario: Watch the Weather
Updated: 2 days ago
When to install winter tires in Ontario comes down to the temperature, not the calendar: tire industry guidance is to make the switch once it's consistently below 7°C. In the Ottawa area, that happens in late October or early November, on average.
Ontario doesn't require winter tires on passenger vehicles but recommends them, and its auto insurance regulation requires insurers to offer a discount for vehicles equipped with them. Quebec's December 1 to March 15 rule covers only vehicles registered in Quebec.
Key Takeaways
It's a temperature, not a date. Switch once the temperature stays consistently below 7°C, rather than on a set day or after one cold morning.
Cold changes how tires grip. Below about 7°C, all-season and summer tires begin to stiffen and lose grip, while winter tires stay flexible at much lower temperatures.
Around Ottawa, it's late October or early November. That's when temperatures settle below 7°C on average, but any given year can run earlier or later.
Ontario recommends them but doesn't require them. Since January 1, 2016, Ontario's auto insurance regulation has required insurers to offer a discount for vehicles equipped with winter tires, so ask your insurer.
Quebec's rule is for Quebec plates. Quebec requires winter tires from December 1 to March 15 on vehicles registered there, and the rule doesn't apply to vehicles registered outside Quebec.
Look for the symbol, and fit all four. The three-peak mountain snowflake symbol marks a winter tire, and winter tires go on as a full set of four.
When to Install Winter Tires in Ontario: The Short Answer
Put your winter tires on once the temperature is consistently below 7°C. The Tire and Rubber Association of Canada's guidance is to change over "as soon as the temperature consistently dips below 7°C," and tire makers say the same, so the signal is a run of cold days, not one chilly morning.
That's why no single date works every year. The cold settles in on its own schedule each fall, so the forecast is a better guide than the calendar.
If you drive from Carleton Place into Kanata every morning and switch on the same weekend each year, that habit can leave you early one fall and late the next.
Why 7°C Is the Number to Watch
Below about 7°C, the rubber in all-season and summer tires begins to stiffen and lose grip. Transport Canada says that below 7°C, all-season and summer tires "begin to lose elasticity, leading to less traction," and Ontario's Ministry of Transportation notes that all-season tires "can start to lose grip at 7°C."
Quebec's government describes the same effect: below 7°C, the rubber compound of summer and all-season tires "hardens and loses its grip." It's the cold that changes the rubber, so it matters before there's any snow on the road.
Winter tires are built for the cold. Transport Canada says they "keep their elasticity and grip at much lower temperatures," and Ford describes a rubber compound that stays flexible in extreme cold, with larger tread gaps for slush, snow and ice.
Ontario's Ministry of Transportation says winter tires improve traction and control in frost, snow and ice, and can shorten braking distances by as much as 25%. They don't take away the risk of a collision, so drive for the conditions too.
When Does the Ottawa Area Drop Below 7°C?
Environment and Climate Change Canada's climate normals for Ottawa (1991 to 2020) put the average daily temperature at about 8°C in October and about 2°C in November. So in the Ottawa area, temperatures settle below 7°C in late October or early November, on average.
Any given year can run earlier or later, so keep an eye on the forecast as October goes on.
On average, the cold reaches the Ottawa area a little sooner than Toronto. Ottawa's October and November averages run about two degrees colder, and its average first frost comes about two weeks earlier.
That's one more reason to go by the temperature: a date that suits Toronto can arrive late for drivers in the Ottawa area.
Frost and Snow Aren't the Signal
A first frost or a first snowfall isn't the signal to switch; a run of days below 7°C is. On average, the first fall frost around Ottawa arrives in early October, so frosty mornings come a few weeks before the days stay cold.
Measurable snow is uncommon in October around Ottawa, under one day on average, and becomes a regular visitor in November.
So if you wait for snow before switching, you may already have driven through days below 7°C on tires that have started to lose grip. If the forecast already shows a run of cold days, there's no reason to hold off.
Is your vehicle due for a service visit before winter? Book your service online with Carleton Place Ford.
Does Ontario Require Winter Tires?
No. Ontario doesn't require winter tires on passenger vehicles, but the province does recommend them.
Ontario's official Driver's Handbook puts it this way: "it is recommended that your vehicle be equipped with four winter or all-weather tires with the same tread pattern."
So in Ontario, winter tires are your decision, and the province's own advice is to use them.
Winter Tires and Your Insurance in Ontario
Ontario doesn't make you use winter tires, but it does give you a reason to: since January 1, 2016, Ontario's auto insurance regulation has required insurers to offer a discount for vehicles equipped with winter tires. The regulation doesn't set the amount or the conditions, so ask your insurer what it offers and what it needs from you.
Driving Into Gatineau? Quebec's Rule Is for Quebec Plates
Across the river in Gatineau, the rules are different: Quebec requires winter tires from December 1 to March 15 on vehicles registered in Quebec. Quebec's government says the requirement doesn't apply to vehicles registered outside Quebec, so it's a deadline for Quebec plates, not for Ontario ones.
For an Ontario driver, the temperature is still the better guide. On average, the Ottawa area drops below 7°C weeks before December 1, so Quebec's date is no reason to wait on Ontario plates.
How to Tell a Winter Tire From an All-Season
To tell a winter tire from an all-season, look on the sidewall for the three-peak mountain snowflake symbol. Ontario's Ministry of Transportation calls it "the easiest way to know a tire has been designed specifically for severe snow conditions," and Transport Canada says tires with it "meet specific snow traction performance requirements."
Don't rely on "M+S" alone. That mud-and-snow marking is common on all-season tires, and tire makers note it's based on the tread design rather than a snow traction test.
Ford gives buyers the same advice: look for the mountain snowflake symbol. Quebec's rule goes a step further and counts only tires with that symbol, or studded tires, as winter tires.
Put them on as a full set of four: Transport Canada and Ontario's Ministry of Transportation both say so. Our article on rotating a winter set explains how to keep all four wearing evenly.
If you're shopping for a set, our winter tire packages are a place to start.
A Quick Checklist Before the Cold Settles In
A few checks before the cold settles in make the switch easier to time and the insurance question easier to answer. You'll need the forecast, a look at your tire sidewalls, a word with your insurer and, if you drive in from Gatineau, a glance at your plates.
The forecast. Watch for a run of days consistently below 7°C, not one cold morning or the first frost.
The symbol. Check each winter tire's sidewall for the three-peak mountain snowflake symbol, not "M+S" alone.
All four. Plan on a full set of four winter tires, not a pair.
Your insurer. Ask what discount it offers for winter tires and what it needs from you.
Your plates. On Quebec plates, Quebec's December 1 to March 15 rule applies; on Ontario plates, the temperature is your guide.
Contact us with questions or feedback.
Heading Into Winter With Carleton Place Ford
Carleton Place Ford has two pages to keep handy as winter gets close. If you're buying winter tires, our Price Match Promise page is worth a read, and the booking page is where a service visit starts.
Book your service online with Carleton Place Ford.
Frequently Asked Questions
When Should I Put My Winter Tires On?
Put them on once the temperature is consistently below 7°C, which is the tire industry's guidance. One cold morning isn't enough; a run of cold days is the signal.
Around Ottawa, temperatures settle below that mark in late October or early November, on average.
Is There a Temperature Rule for Winter Tires?
No law sets one, but there is a guideline: 7°C. Below it, all-season and summer tires begin to stiffen and lose grip, while winter tires stay flexible at much lower temperatures.
Tire makers and the Tire and Rubber Association of Canada advise switching once it's consistently below 7°C.
Are Winter Tires Mandatory in Ontario?
No. Ontario doesn't require winter tires on passenger vehicles, but the province recommends them.
Quebec is different: it requires winter tires from December 1 to March 15, but only on vehicles registered in Quebec.
Can Winter Tires Get You an Insurance Discount in Ontario?
They can. Since January 1, 2016, Ontario's auto insurance regulation has required insurers to offer a discount for vehicles equipped with winter tires.
No amount or conditions are set in the regulation, so ask your insurer what it offers and what it needs from you.
Do Quebec's Winter Tire Rules Apply If You Drive to Gatineau?
Not if your vehicle is registered in Ontario. Quebec requires winter tires from December 1 to March 15 on Quebec-registered vehicles, and Quebec's government says the rule doesn't apply to vehicles registered outside Quebec.
On Ontario plates, go by the temperature, which around Ottawa drops below 7°C weeks before December 1, on average.
When Should I Take My Winter Tires Off?
In spring, tire makers advise switching back once temperatures consistently stay above 7°C. One warm afternoon isn't the signal: spring weather swings, so wait until the warmth holds.
Around Ottawa that means late April, on average, and April still averages a dozen or so nights at or below freezing.
Source: Transport Canada, Ontario's Ministry of Transportation and its Driver's Handbook, Ontario's auto insurance regulation, Quebec's government, the Tire and Rubber Association of Canada, tire makers, Ford Canada's seasonal tire page, and Environment and Climate Change Canada's climate normals for Ottawa and Toronto.
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About the Author:
Kerry Irven is the Vice President of New and Used Automotive Operations for Heighton Automotive Group, a family-owned and operated automotive group serving communities across Eastern Ontario. Kerry began his automotive career in new-car sales, building his experience on the showroom floor and working his way through multi-store dealership operations.
With over 25 years in the automotive industry, Kerry has helped grow automotive businesses from one location with 40 to 50 vehicles in stock to more than 500 vehicles across 10 rooftops. His hands-on background in both new and used-vehicle operations gives him a practical understanding of what customers look for when shopping for their next vehicle.
Throughout his career, Kerry has always been actively involved in staff coaching and in understanding customer wants and needs, helping ensure the businesses he works with continue to adapt to what customers are truly looking for.
One of the most exciting chapters of his career has been the shift into modern automotive marketing, embracing new technology, transparent pricing, customer-first inventory strategies, and new ways to create a better vehicle-shopping experience.
Kerry has completed extensive automotive training, including certification through the Ontario Motor Vehicle Industry Council, involvement with the Used Car Dealers Association of Ontario, Canadian automotive dealer training, and multiple customer service courses.
Born and raised on a farm, Kerry has always valued family, hard work, and a practical, down-to-earth approach. Joining Heighton Automotive Group and working alongside Thomas Heighton and family, along with managing partners Kyle Lothian and Martin Gougeon, has allowed him to bring those same values into the car business. It has also allowed Kerry to continue following a simple philosophy: treat every customer exactly the way he would want to be treated.
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