Wyoming truck chain law
When WYDOT posts a chain restriction, commercial vehicles must chain at least two drive wheels at opposite ends of the same drive axle. Up to $250, or $750 if you close the road.
| Type | Chain up when posted |
|---|---|
| Carry season / effective dates | None in statute; restrictions apply when signs (including electronic signs) are posted (W.S. 31-5-956(e)). |
| Who must carry chains | Not stated in the official sources we checked. Confirm with the state. |
| When you must chain up | Commercial vehicles chain at least two drive wheels at opposite ends of the same drive axle when tire chains are required. Chains: two side loops joined by at least nine cross chains, or an equivalent device (31-5-956(k)). |
| Where | Any highway WYDOT restricts by posted signs. |
| Penalty | Misdemeanor, up to $250; up to $750 if the violation causes an incident closing all lanes in one or both directions (W.S. 31-5-956(j)). |
| Law | W.S. 31-5-956 |
Official sources
Checked 2026-10-29. Chain controls are set live by the state, so follow posted signs and officers. Not legal advice.
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