[Answer] What is the only U.S. National Park to fully close each winter?

Step 1 : Introduction to the question "What is the only U.S. National Park to fully close each winter?"

...1. Theodore Roosevelt National Park, North Dakota 2. Wind Cave National Park, South Dakota 3. Isle Royale National Park, Michigan 4. Gates of the Arctic National Park, Alaska

Step 2 : Answer to the question "What is the only U.S. National Park to fully close each winter?"

Isle Royale National Park, Michigan - Michigan’s Isle Royale National Park covers the entirety of a 45-mile-long island in Lake Superior, the northernmost of the Great Lakes. Rugged and remote, it’s one of the least visited of the U.S. National Parks. One reason may be that the island fully closes every year from November 1 to April 15 — the only national park to do so — as the frigid conditions of Lake Superior make it too dangerous for visitors. The island is accessible only by boat or seaplane, and all wheeled vehicles — even bicycles — are banned. The pristine backcountry is worth the journey for hikers and campers who want to explore unspoiled wilderness and share the trails with the island’s resident moose and wolves.:

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