2022 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

https://mdotjboss.state.mi.us/APSWB/APBHome.htm?bulletin=active

Spring Weight Restriction Bulletins

https://mdotjboss.state.mi.us/APSWB/searchBySpringWeight.htm?year=2021

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 you 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.
Federal bridge formula.