Oregon Frost Laws & Spring Thaw Limits
Oregon has no single statewide spring-thaw percentage. ODOT and local road authorities impose seasonal and weather-based weight limits route by route (authority ORS 810.030) and post them on TripCheck and the ORION restriction list. The bigger spring hit is on county and forest roads, where agencies sign reduced 'X-ton' seasonal limits. Interstates stay at full legal weight. Check TripCheck and the specific county before you haul, because the routes and dates reset every spring.
A detail here is flagged medium confidence — confirm with the state DOT before you rely on it.
How Oregon handles spring thaw
Oregon has no single statewide spring-thaw percentage. ODOT and local road authorities impose seasonal and weather-based weight limits route by route (authority ORS 810.030) and post them on TripCheck and the ORION restriction list. The bigger spring hit is on county and forest roads, where agencies sign reduced 'X-ton' seasonal limits. Interstates stay at full legal weight. Check TripCheck and the specific county before you haul, because the routes and dates reset every spring.
Window, reduction, and where to check
- Season: No single statewide spring-thaw calendar. ODOT and local road authorities impose seasonal and weather-based weight limits where roads soften, roughly March into May, declared and lifted each year by condition.
- Reduction: Posted route by route: reduced axle/gross limits or a signed 'X-ton' cap on the affected road. The heaviest cuts fall on county and forest roads. No fixed statewide percentage.
- Interstates: Exempt from the seasonal reduction
- Find the current order: ODOT TripCheck (tripcheck.com) and the ORION road-and-bridge restriction list for state highways. Check the specific county or forest-road authority for local seasonal postings.
- Overweight penalty: Standard Oregon overweight penalty per ODOT's presumptive fine schedule, charged by the amount over the reduced limit.
Oregon Frost Law FAQ
Does Oregon have frost laws?
When are Oregon's spring weight restrictions in effect?
How much do the limits drop in Oregon?
Do Oregon's frost laws apply to the Interstates?
Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://www.oregon.gov/odot/mct/pages/oregon-highway-restriction-notices.aspx. See our Terms & Disclaimer.
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