Rocky Woods is a 491-acre (199 ha) open space preserve located in Medfield, Massachusetts. The preserve, managed by the land conservation non-profit organization The Trustees of Reservations, is notable for its rugged terrain. Rocky Woods offers 6.5 miles (10.5 km) of trails and former woods roads available for hiking, horseback riding, mountain biking, catch and release fishing, and cross country skiing. Rocky Woods is a spur link in the 200-mile (320 km) Bay Circuit Trail system. The preserve is part of a larger area of protected open space including the abutting Fork Factory Brook preserve, also managed by The Trustees of Reservations.