Michigan tightens firewood rules to combat invasive pests and diseases

Michigan authorities have announced a statewide ban on untreated firewood imports, effective from January 1, 2027, to mitigate the risk of introducing invasive plant pests and pathogens. The measure targets the movement of firewood through all entry points into the state, including those used by recreational campers and commercial suppliers.

Under the new restrictions, only certified and heat-treated firewood will be permitted into Michigan. Certain processed wood products will also receive exemptions from the ban. State officials estimate that untreated firewood poses a significant vector for spreading more than 140 identified plant pests and diseases that threaten Michigan's forests and ecosystems.

The implementation will proceed in phases, with regulatory authorities prioritizing public awareness and education during 2027. Beginning in 2028, enforcement measures will intensify, with penalties for non-compliance ranging from $1,000 to $10,000 for repeat violations.

Forest health officials have emphasized that the restriction aims to protect Michigan's timber resources and natural environment from potentially catastrophic pest infestations. Similar firewood regulations have been adopted or proposed across multiple North American jurisdictions in recent years to prevent the translocation of invasive wood-boring insects and forest pathogens.