The feral horse herds are believed to be descendants of horses that survived a shipwreck off the coast of Virginia centuries ago.
The island is a barrier island, meaning it protects the mainland from the direct force of Atlantic storms and waves.
There are two separate horse herds on the island, divided by a fence at the Maryland-Virginia state line.
The National Park Service maintains a 'hands-off' management policy, allowing the horses to live as wild animals.
The island's landscape is constantly reshaped by 'overwash,' where ocean water flows across the island into the bay during high-tide storms.
Assateague is one of the few places in the United States where visitors can camp on the beach in designated areas.
The island has no permanent human residents, as it is a protected natural environment.
Mosquitoes and biting flies are a significant part of the island's ecology, particularly in the salt marshes during summer months.
The Chincoteague Pony Swim, an annual event in July, involves moving the Virginia herd across the channel to Chincoteague Island.
Assateague Island National Seashore is a 37-mile-long barrier island ecosystem spanning the Maryland and Virginia border, best known for its free-roaming herds of feral horses. The park features diverse habitats including salt marshes, maritime forests, and sandy ocean beaches. It serves as a critical stopover for migratory birds along the Atlantic Flyway. The Maryland portion is managed by the National Park Service, while the Virginia end is primarily managed as the Chincoteague National Wildlife Refuge. Visitors can explore via kayak, bicycle, or hiking trails that cross various coastal environments. The island is dynamic, with its shoreline and inlets shifting constantly due to natural storm activity and erosion. Vehicle access is restricted to the northern end of the island, with the southern tip only accessible via Chincoteague. There are no bridges connecting the Maryland and Virginia sections of the island.
The marshland trails near the visitor center provide the best opportunities for photography of horses against the backdrop of the wetlands.
Bring high-quality insect repellent, as biting flies and mosquitoes are extremely aggressive during warm months.
Store all food in hard-sided containers to prevent the island's horses and foxes from stealing supplies.
Check the official website for 'overwash' alerts before driving, as high tides can occasionally flood access roads.
Do not attempt to walk across the inlet to reach the Virginia side, as current conditions are dangerous and there is no bridge connectivity.
The park is open year-round, though some facilities and campgrounds operate seasonally or may close during severe weather events.
Maintain a minimum distance of 40 feet from all horses, as they are wild animals that can bite or kick; feeding or touching wildlife is strictly prohibited.
