Pennsylvania Frost Laws & Spring Thaw Limits
Pennsylvania runs a freeze/thaw program. PennDOT's Publication 23 sets the window at roughly February 15 to April 15, and dates shift with the weather each year (75 Pa.C.S. § 4902). It's no blanket percentage cut. PennDOT posts 'weight limit' roads, often 10 ton, and suspends local-determination (LoLD) permit hauling during thaw. The posted sign is the law on that road. Interstates stay exempt. Run over a posted weight and it's $150 plus $150 per 500 lb over. Check PennDOT by district each trip.
How Pennsylvania handles spring thaw
Pennsylvania runs a freeze/thaw program. PennDOT's Publication 23 sets the window at roughly February 15 to April 15, and dates shift with the weather each year (75 Pa.C.S. § 4902). It's no blanket percentage cut. PennDOT posts 'weight limit' roads, often 10 ton, and suspends local-determination (LoLD) permit hauling during thaw. The posted sign is the law on that road. Interstates stay exempt. Run over a posted weight and it's $150 plus $150 per 500 lb over. Check PennDOT by district each trip.
Window, reduction, and where to check
- Season: Roughly February 15 to April 15, the freeze/thaw period defined in PennDOT Publication 23. Exact dates shift every year with the weather and are set by the posting authority and district.
- Reduction: No uniform percentage cut. Affected roads carry a posted tonnage cap, commonly 10 ton, and PennDOT suspends or tightens local-determination (LoLD) permit hauling during the freeze/thaw window.
- Interstates: Exempt from the seasonal reduction
- Find the current order: Check PennDOT's Posted and Bonded Roadways information by district, or call 1-800-FIX-ROAD (1-800-349-7623). Freeze/thaw postings and permit suspensions are re-set every season.
- Overweight penalty: Summary offense with a base fine of $75. Exceed a posted weight and it's $150 plus $150 for each 500 lb, or part of it, over 3,000 lb above the posted maximum (75 Pa.C.S. § 4902).
Pennsylvania Frost Law FAQ
Does Pennsylvania have frost laws?
When are Pennsylvania's spring weight restrictions in effect?
How much do the limits drop in Pennsylvania?
Do Pennsylvania'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 Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it.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.pa.gov/agencies/penndot/programs-and-doing-business/posted-and-bonded-roadways/law-regulation-policy. See our Terms & Disclaimer.
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