The best time to change to winter tires is when ambient temperatures consistently fall below approximately 7°C (45°F). This temperature threshold is important because winter tires are designed to perform well in cold conditions; the rubber remains flexible below this temperature to provide better traction. If you wait until it is colder, your summer or all-season tires may become less effective. Many people follow the general rule to switch to winter tires around late October or November and change back to summer or all-season tires around March or April, depending on their local climate. Specifically, nighttime and early morning temperatures staying near or below 40°F (around 4-7°C) is a good indicator to make the switch to winter tires. You should change back to summer or all-season tires when temperatures rise consistently above 7°C, as winter tires on warm, dry roads wear out more quickly and are less effective. To summarize:

• Switch to winter tires when temperatures drop below about 7°C (45°F), usually around late October to November.
• Change back to summer or all-season tires when temperatures rise above 7°C, often around March to April.
• Consider local climate and specific driving needs, such as mountain trips or areas with frequent snow or ice.

This guidance ensures optimal tire performance, safety, and tire longevity.