According to MDOT, the remaining spring weight restrictions on all state trunkline highways ended at 7 a.m. Friday, bringing the state’s 2026 frost law season to a close.

The restrictions applied to state-maintained highways carrying interstate, U.S. highway, and Michigan route designations.

Seasonal Restrictions Help Protect Roads During Spring Thaw

Michigan applies seasonal weight restrictions each year during spring thaw periods when roadbeds become more vulnerable to damage caused by heavier axle loads.

During frost thaw cycles, moisture beneath pavement weakens roadway structures, making certain routes more susceptible to cracking, rutting, and long-term surface damage under commercial traffic.

The restrictions often affect route planning, freight weight distribution, delivery timing, and operating costs throughout late winter and spring operations.

With the state restrictions now removed, normal commercial weight movement can resume on Michigan trunkline highways heading into the summer freight season.

Some Local Limits May Still Remain in Place

Although state restrictions have ended, MDOT noted that county road commissions and local public works departments may still maintain their own seasonal weight limits depending on roadway conditions.

Local restrictions do not always follow the same timeline as state routes, meaning some municipal roads, secondary highways, and rural freight corridors could still carry posted limits in certain areas.

Anyone operating through local delivery zones, construction areas, or smaller municipal routes may still need to monitor posted signage tied to local restrictions.

Updated restriction information remains available through MDOT’s website and seasonal route maps. The state also offers email alert options tied to restriction updates and route condition changes throughout the year.

The end of Michigan’s frost law season is typically viewed across the freight industry as one of the clearer indicators that seasonal operations are shifting fully toward summer freight patterns.

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Last updated: May 18, 2026

Source: Truckers News

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