2021 Michigan winter frost/spring thaw laws and seasonal weight restrictions.

Frost/thaw laws usually go into effect by February. However in many years they have been placed into effect earlier. Use the information and links below for live clarification.

Active permit restriction bulletins.



Spring weight restriction bulletins.


Overweight shipments.

No shipment overweight (no matter what axle configuration) is permitted to travel during the spring thaw. It should also be noted some shipments may be required to reduce load weights by 25-35% on state roads during the spring thaw months. If your have more than 11 axles total you will not be permitted to leave or enter Michigan during the spring thaw months.

Oversize shipments.

Any shipment in excess of 14′ in width is not permitted to travel during the spring thaw months.


See also:

Tire chain laws.
Tire chain laws by location.
Trucking regulations.
Federal bridge formula.
Exemptions from seasonal restrictions.

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