Pillsbury State Park is a state park located mainly in Washington and partially in Goshen, New Hampshire, in the United States. It is home to the headwaters of the Ashuelot River. It contains one of the more rustic campgrounds in the state park system, with no electricity and limited running water. There are 35 campsites, most of which are reservable. Eleven of the sites are at "remote" locations, most of which are accessible by canoe. Hiking trails connect to the 51-mile-long (82 km) Monadnock-Sunapee Greenway trail.