Wyoming Studded Tire Law

Running studs in Wyoming

No seasonal limit. Wyoming lets you run metal studs any month of the year (Wyo. Stat. 31-5-956), and there's no GVW cap, so a loaded truck can run studs year-round — the studs just have to be a type approved by the state and not materially injure the pavement. But studs are not chains: when Wyoming's chain law hits Level 1 or Level 2 on I-80, you still have to chain up.

The window and winter-tire rules

• Season: No seasonal limit. Metal studs are legal in any month (Wyo. Stat. 31-5-956), provided they are a type approved by the state transportation superintendent and don't materially injure the road surface.
• No statewide winter-tire (M+S/3PMSF) mandate, but WYDOT can restrict any highway when snow or ice makes travel hazardous (Wyo. Stat. 31-5-956(e)). A Level 1 restriction admits vehicles on adequate snow tires or tire chains, or all-wheel drive. A Level 2 restriction admits only vehicles with tire chains, or all-wheel drive on adequate mud and snow rated tires, and a commercial vehicle that must chain puts chains on at least two drive wheels at opposite ends of one drive axle. Studs are not chains, so they never clear Level 2 for a conventional truck. Truck weight cap: none, studs legal for trucks year-round if the superintendent approves the type. See the Wyoming chain-law page.

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