Venomous Snakes Like Rattlers Swim Along Southeast U.S. Coasts

Beachgoers often scan the horizon for sharks or worry about rip currents. They rarely think about snakes. Yet some U.S. coastal areas hide these reptiles near dunes and marshes. Several venomous species call the Gulf and Southeast coasts home. A few of them can even swim. Yellow-bellied sea snakes have appeared on Southern California shores, especially during El Niño storms.

Snakes usually ignore humans. They strike only when threatened or handled. WorldAtlas lists specific spots with high snake activity. Pensacola Beach in Florida stands out. Eastern diamondback rattlesnakes live there. In 2018, observers saw three of these snakes near Fort Pickens within a single week. One was spotted swimming in the Gulf of America. The National Park Service confirms eastern diamondbacks belong to the native wildlife of Gulf Islands National Seashore. They thrive in coastal dune habitats.

Georgia and South Carolina barrier islands also host these creatures. Eastern diamondbacks roam portions of both coasts. Documentation places them on sea islands farther up the coast, such as those in South Carolina's ACE Basin. These reptiles use maritime forests, dune scrub, and palmetto thickets for shelter. The species mix shifts as you travel west along the Gulf Coast. Western diamondbacks appear on the Texas coast. Cottonmouths inhabit coastal marshes and other wet areas there too. They generally stay behind the beach in dunes or scrub rather than open sand.

Southern California records show rare sightings of yellow-bellied sea snakes. WorldAtlas noted these at Silver Strand Beach in Oxnard, Bolsa Chica State Beach, and Coronado Dog Beach. The Natural History Museum of Los Angeles County has documented these rare appearances as well. Several incidents linked to El Niño events stand out. Unlike the rattlesnakes found along parts of the Gulf and Southeast coasts, this sea snake is a marine species. It normally lives in tropical waters.