The estate was originally developed as a self-sufficient hunting preserve and experimental farm in the 1920s.
Marshall Field III, the estate's former owner, was the grandson of the founder of the Marshall Field & Company department store chain.
The name 'Caumsett' is a Matinecock Native American word meaning 'place by a sharp rock'.
The park serves as a protected sanctuary for the endangered piping plover during its nesting season.
The main house contains 80 rooms and was constructed with extensive brick and limestone detailing.
The landscape plan for the estate was heavily influenced by landscape architect John Russell Pope.
Portions of the park serve as a research site for coastal ecology and habitat restoration studies.
The site was listed on the National Register of Historic Places in 1979.
Several miles of the park's perimeter are fronted by private, rocky beaches along the Long Island Sound.
The estate was once known as the Lloyd Neck estate before the state acquired it for conservation.
Caumsett State Historic Park Preserve occupies the former Marshall Field III estate on a peninsula extending into the Long Island Sound. The park spans 1,500 acres of diverse terrain, including salt marshes, meadows, forests, and shoreline. Visitors access the park via a multi-use trail system that accommodates hiking, birdwatching, and cross-country skiing. The historic Marshall Field mansion serves as the centerpiece of the grounds, reflecting the Gilded Age architectural style of its origin. Wildlife sightings are common, with protected habitats supporting numerous species of migratory birds and local coastal animals. The park features a designated salt-water fishing area and opportunities for scuba diving with a permit. Equestrian trails are available, though visitors must bring their own horses. The preserve functions as an outdoor museum where visitors can observe the preserved landscape design of the original estate.
The brick terrace overlooking the Long Island Sound behind the main mansion.
Bring a pair of binoculars for birdwatching, as the salt marshes are significant stopovers for migratory species.
Wear sturdy, comfortable walking shoes, as the distance from the parking area to the waterfront exceeds one mile.
Check the weather before departure, as the coastal location experiences higher wind speeds and temperatures can differ significantly from inland areas.
Do not attempt to walk to the beach in formal footwear; the terrain is rugged and sandy.
The park is open daily from sunrise to sunset, but vehicle access may be restricted during periods of high capacity.
Carry-in, carry-out policy; no trash receptacles are provided. Stay on marked trails to protect fragile coastal habitats.
