Everything You Need To Know About Frost Laws

How to comply with seasonal weight restrictions

In an effort to curb damage to roadways in the northern United States, seasonal weight restrictions (also known as frost laws) are put into effect every year as the roads start to thaw out.

Typically, from March to May, authorities will limit the weight of trucks and/or speed of trucks that can travel on certain roads while the ground is soft.

Here’s every state that puts frost laws into effect and what you need to know when traveling in northern states in the spring. 

States with Frost Laws 

Idaho

Idaho will sign and mark affected state highways the day before the weight and/ or speed restrictions are in effect. On those sections of highways trucks and buses weighing 10,000 pounds or more will be restricted to 30 mph in critical areas. For specific information about which routes are posted, check out this link.

Illinois

Illinois has seasonal weight restrictions on non-state roads only. State roads do not have frost laws in effect.

Iowa

While Iowa does put frost laws into effect, specific information is difficult to find. Check this link for a map of counties with restrictions in place. Try this link for more resources.

Maine

Maine updates frost laws online so that you can always have the most up-to-date information. Find the latest info here.

Michigan

Michigan updates frost laws online so that you can always have the most up-to-date information. Find the latest info here.

Minnesota

While Minnesota does put frost laws into effect, specific information is difficult to find. Check this link for dates when restrictions go into place. Try this link for contact information for specific counties.

Montana

Montana updates frost laws online so that you can always have the most up-to-date information. Find the latest info here.

New Hampshire

New Hampshire updates frost laws online so that you can always have the most up-to-date information. Find the latest info here.

New York

New York updates frost laws online so that you can always have the most up-to-date information. Find the latest info here.

North Dakota

North Dakota updates frost laws online so that you can always have the most up-to-date information. Find the latest info here.

Ohio

Ohio has seasonal weight restrictions on non-state roads only. State roads do not have frost laws in effect.

Pennsylvania

Pennsylvania updates frost laws online so that you can always have the most up-to-date information. Find the latest info here.

South Dakota

South Dakota updates frost laws online so that you can always have the most up-to-date information. Find the latest info here.

Vermont

Vermont has seasonal weight restrictions on non-state roads only. State roads do not have frost laws in effect.

Washington

Washington provides an updated list of truck restricted roads online. However, roads with seasonal weight restrictions are not specifically listed there.

Wisconsin

Wisconsin updates frost laws online so that you can always have the most up-to-date information. Find the latest info here.

Wyoming

Wyoming updates frost laws online so that you can always have the most up-to-date information. Find the latest info here.

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