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Glacier National Park, MO - When it's open: The park is open year-round, but visitor information facilities are generally open from May to early September.

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Joshua Tree National Park, CA -

When it's open: The park itself is open all year, but certain campgrounds require reservations between October and May. Most others are first come, first served.

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Acadia National Park, ME - When it's open: The Seawall campground is open from the end of May through September. The Schoodic site is open from the end of May until Columbus Day. The Blackwoods campsite is open all year, but a permit is required from December through March.

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Arches National Park, UT - When it's open: The single developed campground in the park, The Devil's Garden, has 50 campsites. Facilities are open year-round, and the visitor center is open every day except for Christmas.

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Olympic National Park, WA - When it's open: The park is open year-round. There are 16 campgrounds within the park and 910 camping sites. The availability of these campgrounds varies, but backcountry camping is allowed all year with a permit.

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Gunnison National Park, CO - When it's open: There are 30 different campsites open throughout the park. The openings of each vary by season and location. The park also allows you to pitch a tent outside of designated campgrounds if you want to go off the grid.

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Yosemite National Park, CA - When it's open: There are 13 highly popular campgrounds and those that are open vary according to the season. Seven of those have a first come, first served system, so reservations are recommended from April to September.

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Badlands National Park, SD - When it's open: There are two campgrounds that are open year-round. Ceder Pass has running water and electricity while Sage Creek is more secluded and has no water on-site.

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Glacier Bay National Park, AK - When it's open: The only campsite at the park, Bartlett Cove is open year-round. However, some amenities are limited during the winter. Permits are free but required from May 1 until September 30.

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Glacier Bay National Park, AK - Cost: There are no camping or entrance fees required. However, permits are required for rafting, boating, and various other recreational activities.

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Great Smoky Mountains National Park, TN - When it's open: The park is open all year, but some of the campgrounds, roads, and visitor centers close during the winter. The Smokemont and Cades Cove campgrounds are open year-round.

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Everglades National Park, FL - When it's open: The park is open all year. There are two designated drive-in campgrounds called Long Pine Key and Flamingo. Backcountry camping is also allowed.

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Crater Lake National Park, OR - When it's open: Out of the two campsites in the park, Mazama is open from June 3 until October 9. The Lost Creek campsite is open from July until mid-October. Backcountry camping is allowed from mid-July until September.

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Pictured Rocks National Lakeshore, MI - When it's open: There are four primary campgrounds that are open year-round. Campsites operate on a first come, first served basis, but early morning arrival is recommended. Reservations are not accepted.

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Pfeiffer Big Sur State Park, CA - When it's open: The park is open year-round, but reservations are highly recommended during high season (from March until September) up to seven months in advance.

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Ozark National Forest, AR - When it's open: Most campsites are open year-round, but others are open only from May through October. There are 23 campgrounds, which are home to a total of 320 sites. Backcountry camping is also allowed throughout the forest.

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Ozark National Forest, AR -

Cost: There is no general entrance fee to the park. Some campsites are free depending on location.

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