Vermont Frost Laws & Spring Thaw Limits

How Vermont handles spring thaw

Vermont mud season is real. Towns post gravel and local roads and VTrans may cut limits on state highways as frost leaves the ground, usually March into spring and re-set every year on short notice. The standard posted town-highway sign is 24,000 lb, and towns may post lower during the thaw (19 V.S.A. 1110). The sign is the law, and your permit does not override it. The Interstate is not posted.

Window, reduction, and where to check

• Season: Mud season, roughly March through April into May, as frost leaves the ground. VTrans may reduce limits on state highways and towns post local and gravel roads. The dates are re-set every year and postings can go up on a few days' notice.
• Reduction: 24,000 lb gross is the standing limit on a class 2, 3, or 4 town highway, sign or no sign (23 V.S.A. 1392(2)), and a bridge with a wood floor, subfloor, or stringers drops to 16,000 lb on a class 3 or 4 town highway and 20,000 lb on a class 1 or 2 town highway unless the selectboard posts otherwise (23 V.S.A. 1392(1)). To run heavier on a town highway you need a permit from the municipality (23 V.S.A. 1400a). During mud season a town may post lower still on the roads that soften, and that sign is the hard limit. A state oversize/overweight permit reaches only state highways and class 1 town highways (23 V.S.A. 1400) and does not override a town posting.
• Interstates: Exempt from the seasonal reduction
• Find the current order: No single statewide map. Check the town or city that posts the gravel and local roads at both ends of your run, watch for posted signs, and confirm any state-highway posting with VTrans. Postings go up on short notice, so check the morning you load.
• Overweight penalty: A posting violation is a traffic offense under 23 V.S.A. chapter 23, carrying a fine of up to $100 plus liability to the town for road damage (19 V.S.A. 1110). An OS/OW permit does not exempt you from a posting; confirm the current amount with the town or VTrans.

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