Warren Island State Park

About this park

Warren Island State Park, established in 1959, is a 70-acre island in Penobscot Bay near the town of Islesboro, accessible only by private boat, making it one of the more genuinely remote and adventurous properties in the entire Maine state park system. There is no ferry service or public boat shuttle to the island, so reaching it requires visitors to arrive under their own power, whether by sailboat, kayak, or motorboat. Once ashore, the island offers primitive camping directly among spruce-fir forest, along with mooring buoys and a dock for visiting boats, making it a popular stop for sailors and kayakers touring Penobscot Bay's many islands. The absence of road access or vehicle traffic gives Warren Island a genuinely quiet, isolated character rare even among Maine's other coastal parks. Because it requires a boat to reach, Warren Island draws a self-selecting visitor base of experienced boaters and backcountry campers rather than casual day-trippers, and its facilities remain deliberately minimal, in keeping with that intended use. Its combination of true island isolation and reasonably developed primitive camping makes it a distinctive bucket-list stop for sailors exploring the midcoast Maine islands.