John Pennekamp Coral Reef State Park Campground sits on Key Largo in the upper Florida Keys, inside the first undersea park in the continental U.S. The small campground offers about 46 full-hookup sites in a single loop, with on-site access to snorkeling and dive charters, kayak launches, boat ramps, and an aquarium. Sites are narrow and closely spaced, but the location puts campers minutes from the park's coral reefs and an hour from Everglades National Park.
Weather and SeasonsWinter through early spring (roughly late fall to March) offers the most comfortable camping, with daytime highs around 70–80°F, lows in the mid-60s, lower humidity, and fewer bugs. This is also the best time for water visibility: calmer seas and clear conditions are ideal for snorkeling, diving, glass-bottom boat tours, and paddling. Winter is the park's busiest season, so book campsites and boat tours well in advance. Summer brings very hot, humid conditions, stronger sun, and afternoon storms, though water temperatures are excellent for snorkeling. No-see-ums and mosquitoes can be relentless in warm months, especially at dusk. Multiple reviewers stressed bringing insect repellent and planning for heat, as shade is limited at many sites.
Natural Features and SceneryThe campground sits within a park protecting part of the only living coral barrier reef in the continental United States. On land, the setting is low, flat, and coastal, with mangroves, tropical hardwood vegetation, and limestone bedrock rather than soft soil. The park's main draw lies offshore: clear turquoise water, coral reefs, and seagrass beds accessible by snorkel and dive tours or private boats from the adjacent marina. Beaches here are small, man-made, and rocky rather than wide sandy strands, though they provide calm, shallow water for swimming and shore snorkeling. Campers mention iguanas and lush greenery around some sites, but many pads are fairly open with limited shade. Views from the campground itself are mostly of neighboring rigs and vegetation due to tight spacing. Short walks lead to water views over mangrove shorelines, the marina, and boats heading out to the reef. Offshore tours offer expansive views of coral, blue water, and marine life. Reviewers note seaweed and plastics on some beaches, and overall reef health has declined compared to past years.