It may seem awfully wintry for late April, but ITD is sticking to the calendar - studded snow tires must be removed in Idaho before this Sunday, May 1. Violations can bring an infraction fine of $62. Idaho allows studded tires only from Oct. 1 through April 30 each year, and unlike Oregon and Washington, which both extended their deadlines for removing studded tires this year because of the lingering winter driving conditions, Idaho's sticking to the plan.

Utah allows studded tires only through March 31; Nevada through April 30; and Montana through May 31. Wyoming? They're legal there all year round.