Fork Factory Brook is a 135 acre (55 ha) historic site, open space reserve, and agricultural reserve located in Medfield, Massachusetts. The reserve, managed by the land conservation non-profit organization The Trustees of Reservations, is notable for its wetlands, ledges, 300 year old hayfields, and ruins of a 19th-century pitchfork mill for which the property is named. Fork Factory Brook offers 1.5 miles (2.4 km) of trails and former woods roads available for hiking, horseback riding, mountain biking, and cross country skiing.