Stillwater State Park, State park in Caledonia County, Vermont

Stillwater State Park is a Vermont state park set along Lake Groton's shoreline, surrounded by forest and open grassland. The park features a small sandy beach, maintained walking paths that loop around the water and into the woods, fishing spots, and picnic areas with restroom facilities.

Stillwater State Park was developed in 1938 by Civilian Conservation Corps crews on state forest land Vermont began buying in 1919. The CCC built the access roads, a picnic area north of Stillwater Creek and about half of the south camp loop; the ranger's house, picnic shelter, stone fireplaces and lean-tos survive. The north loop became a campground in the late 1960s, and the park was listed on the National Register of Historic Places in 2002 for its CCC architecture.

Stillwater State Park lies on Lake Groton, whose calm surface gave the park its name. The Civilian Conservation Corps built the picnic shelter in the north loop and stone fireplaces that campers still use; the north loop became a campground in the late 1960s. The park sits beside the Groton Nature Center and Boulder Beach and Big Deer state parks.

Access is from Boulder Beach Road off Vermont Route 232, north of Groton; the camp road splits at the contact station, with the campground loop left of Stillwater Creek and day-use areas right, near the ranger's house. The park opens between Memorial Day and Columbus Day weekends. Rest rooms have hot showers, and a sanitary dump station is available but there are no hookups.

The park's surviving CCC work earned it a listing on the National Register of Historic Places in 2002. Look for the ranger's house, the picnic shelter in the north loop, stone fireplaces and several lean-to shelters built by the crews. Vermont Route 232, the road into the forest, was also their work.