Buy it where you burn it.

Minnesota Resources Minnesota State Flag

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Minnesota (MN) has the following firewood regulations to protect the state’s natural resources from tree-killing forest pests:
To protect forest health, Minnesota’s Department of Agriculture (MDA) and Department of Natural Resources urges the public to buy MDA certified firewood- it has been heat-treated and is safe to move within the state. Minnesota State Parks only allow MDA certified firewood or firewood purchased at the park. Also, Chippewa and Superior National Forests prohibit out-of-state firewood and recommend getting firewood from nearby sources. Private campgrounds often have their own firewood policies as well; be sure the find out the firewood rules before traveling with firewood. Bringing firewood from Canada into the USA is prohibited unless the firewood is labeled and certified heat-treated. Read about these requirements on the USDA and CBP firewood information sheet. Bringing firewood from the USA into Canada is prohibited unless the firewood is labeled and certified heat-treated. Canada also encourages visitors to use local firewood.
 

This summary is provided by our friends at Don't Move Firewood. To learn more about firewood, please visit their site at dontmovefirewood.org.