Customs Requirements
![]() Nelson Decker Clearing Customs Prior to ArrivalCustoms cannot be cleared on Isle Royale. If you did not clear customs prior to your visit, you will be told to leave Isle Royale National Park.
Learn more about U.S. Customs and Border Protection's pleasure boat reporting requirements. Private Seaplane CustomsCustoms clearance for private seaplane passengers is not available on Isle Royale. Private seaplaners flying to Isle Royale from Canada need to go to a mainland port of entry prior to arriving on-island. More InformationFor more information and updates on current customs requirements, visit U.S. Customs and Border Patrol, or contact Grand Portage Customs and Border Patrol.
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Last updated: April 11, 2025