Winter tire change: Guidelines for optimal safety and timing

Drivers are advised on the optimal timing for switching from summer to winter tires as temperatures begin to drop. A common rule of thumb is the ‘O to O’ guideline, suggesting winter tires should be used from October to Easter, though experts note this is merely a rough orientation rather than a legal requirement.

Technical guidelines suggest that winter tires become significantly more effective when temperatures regularly fall below 7 degrees Celsius. At lower temperatures, the rubber compound of summer tires hardens, leading to reduced grip and longer braking distances. While modern summer tires may still perform well on dry or partially wet roads just above freezing, winter tires are essential for handling snow, ice, and slush.

Legal requirements vary by region. In Germany and Austria, winter tires are mandatory during winter road conditions such as ice or snow. In the Czech Republic, a general winter tire mandate applies starting November 1. Failure to comply with these regulations can result in fines and potential issues with insurance coverage in the event of an accident.