Washington Spring Thaw Weight Restrictions (Frost Laws)

Washington Spring Thaw Weight Restrictions

Washington is one of the 21 states this engine already prices permits for, so a restriction here can change a quote we issue. The feed is a typed JSON API and carries a start and end date per restriction.

Check WSDOT — Commercial vehicle route restrictions before you dispatch.

This page mirrors the state's publication with a timestamp; it is not the authority. We hold no current reading of this source. Open the state's own page.

In force on 2026-09-09

Status unknown — check the state

We hold no confirmed restriction list for Washington right now. That is not the same as "no restrictions" — open the state's page below.

The source, and how we read it

JSON API · Machine-readablePolled weekly (off season)

Publisher: Washington State Department of Transportation
Authoritative page: https://wsdot.com/travel/real-time/truck-restrictions
Data endpoint: https://wsdot.wa.gov/Traffic/api/CVRestrictions/CVRestrictionsREST.svc/GetCommercialVehicleRestrictionsAsJson
Format: JSON API — Machine-readable
What we do with it: Parsed into dated restriction rows.
Posting season: 02-01 to 05-15 — WSDOT posts seasonal load restrictions on state highways during the spring thaw and publishes them alongside its other commercial-vehicle restrictions in the Traveler Information API.
Polling cadence today: Outside Washington's posting window by 117 days — polled weekly, so an unscheduled restriction and a broken source are both found before the season opens.
If our copy goes stale: It errs toward showing a restriction the state has already lifted, because this source publishes only what is currently in force.

Other states

All states and what each one publishes · Oversize & overweight permit calculator