Washington truck chain law
Vehicles over 10,000 lb GVWR must carry chains on designated routes from November 1 to April 1, plus at least two extra chains. Ignoring a posted chain requirement is a $500 infraction.
| Type | Must carry chains (dated or standing rule) |
|---|---|
| Carry season / effective dates | November 1 to April 1: chains must be carried at all times on designated routes. April 2 to October 31: only when posted (WSDOT). |
| Who must carry chains | Vehicles and combinations over 10,000 lb GVWR, which must also carry at least two extra chains (WAC 204-24-050(2)(f)). |
| When you must chain up | When "chains required" signs are posted for vehicles over 10,000 GVWR, chains must be mounted per axle configuration in WAC 204-24-050(2). Chains must be two-sided, not plastic, with hardened metal cross chains. |
| Where | Designated mountain routes listed by WSDOT (see source). |
| Penalty | Traffic infraction with a $500 penalty including all statutory assessments (RCW 47.36.250(4)). |
| Law | RCW 47.36.250; WAC 204-24-050 |
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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