Indiana Frost Laws & Spring Thaw Limits

How Indiana handles spring thaw

Indiana's frost laws are a county job, not a state one. INDOT leaves state roads and US highways unposted, but county highway departments declare frost limits on their own roads each spring as the ground thaws, usually late February into April. Many counties drop to a flat 10-ton cap; some sign a graduated axle schedule and a few bar anything over 5 tons (IC 9-20-1-3; local ordinances). The posted county sign is the law. Call the county before you route.

Window, reduction, and where to check

• Season: Declared by county highway departments each spring as the ground thaws, commonly late February through April and shifting every year. Newton County, for example, runs February 1 to April 1. INDOT does not post frost laws on state roads or US highways.
• Reduction: Counties post frost-law limits on their own roads. Many drop to a flat 10-ton gross cap; some use a graduated axle schedule (LaPorte County, for example, holds 4-wheel vehicles to 8,000 lb and 10-wheel to 40,000 lb) and Newton County bars anything over 5 tons. The posted county limit is the law, permit exceptions aside.
• Interstates: Exempt from the seasonal reduction
• Find the current order: Check the county highway department for the roads you'll run; many counties post frost-law dates and limits online or on a recorded update line. INDOT's state roads and US highways aren't posted for frost, so the cut lands on the county and city roads at each end.
• Overweight penalty: Standard Indiana overweight penalty (civil penalties under IC 9-20-18), charged by the amount over. On a county frost road the county enforces its own posted ordinance limit. Expect to offload or get a county permit before you continue.

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