Welcome to Grand Isle State Park, located on South Hero Island in Lake Champlain. The Island, also known as Grand Isle, is 14 miles long and over 3 miles wide, making it the largest in Lake Champlain. It contains the towns Grand Isle (on the northern half) and South Hero (on the southern half). The North and South Hero Islands are named in honor of early pioneering Vermonters who served in the American Revolution.

Grand Isle State Park was opened in 1959 when 54 acres of land was purchased from Birchcliff, a private summer resort. The original acquisition included a hotel-like building, cabins and a recreation hall. Today's Nature Center is the last remaining Birchcliff building. Three additional property acquisitions brought the park to its current 226-acre size. Park development during the 1960's was spurred by a successful effort to attract visitors to the area by providing quality camping opportunities.