Porcupine Mountains Wilderness State Park, State park with old-growth forests in Upper Peninsula, Michigan.

Porcupine Mountains Wilderness State Park is a large forest preserve in Michigan's Upper Peninsula featuring steep ridges, cascading waterfalls, and a rocky shoreline along Lake Superior. The landscape shifts between dense wooded valleys and open vistas where visitors can see across the water for long distances.

This land became protected as a state park in 1984 to preserve the largest continuous tract of old-growth hardwood forest in North America. The forest developed over centuries in a region largely untouched by large-scale industrial logging.

The park lies in the historic range of Ojibwe (Anishinaabe) peoples, who hunted, fished and gathered in these hills and used the rivers as travel routes. The name Porcupine comes from the Ojibwe word for porcupine, referring to the animal's shape seen in the ridgeline. Visitors can look for the park's Ojibwe place names on maps and trail signs.

The park offers over 140 kilometers of marked trails for hiking through varied terrain, ranging from short day walks to multi-day backcountry routes. Lodging options include campgrounds and basic cabins positioned at different locations throughout the park.

The park's name comes from the Ojibwe word for porcupine, referring to the animal's profile seen in the ridgeline. The 1940s-era Summit Peak observation tower, rebuilt in 2004, is the highest point in Michigan at 595 meters. The park's 24,000 hectares include 35,000 acres of old-growth forest, one of the largest remaining in the eastern US.