All Season vs. All Weather Tires: A General Overview
All season and all weather tires sound similar but perform differently in cold conditions. This overview summarizes the differences using publicly available information.

Two popular year round options for Canadian drivers are all season tires and all weather tires. The names sound alike but the Tire and Rubber Association of Canada notes meaningful differences in how each performs in cold conditions.
All Season Tires
All season tires are designed for use primarily in spring, summer, and fall. Their compounds are generally not optimized for sustained temperatures below 7°C, which is why TRAC and Transport Canada often describe them as three season tires in a Canadian context.
All Weather Tires
All weather tires are designed to meet a broader range of conditions. Tires that carry the Three Peak Mountain Snowflake (3PMSF) symbol have met a minimum snow traction standard recognized by Transport Canada. Their compounds are formulated to stay flexible in colder temperatures and resist wear in warmer temperatures.
General Guidance
Drivers in regions with mild winters and mostly cleared roads may find all weather tires a practical single set option. Drivers who regularly encounter severe cold, heavy snow, or icy rural routes often benefit from a dedicated winter tire set for the cold months and separate tires for warmer months.
Final selection should take into account your vehicle, typical routes, climate, and the specifications listed on the driver side door jamb sticker. A qualified tire professional can help you evaluate the right option for your situation.