When are studded tires legal to use and can they substitute for chains?
Studded tires are approved for use from November 1 to March 31. The Washington State Department of Transportation (WSDOT) determines additional periods in which they can be used. Studded tires are not allowed on vehicles over 10,000 pounds. Studded tires are not a substitute for chains. For more information, see our Traction Devices Web page.