haley farm state park is a public recreation area that preserves colonial-era farmland as open space in the town of groton, connecticut. the site of the state park once formed part of the lands granted to governor john winthrop and later became a dairy farm. the park's are connected to the adjacent bluff point state park by way of a pedestrian bridge over railroad tracks. park activities are restricted to bicycling and walking. the park is managed by connecticut department of energy and environmental protection.