| Nashua River Rail Trail | |
|---|---|
 The Nashua River Rail Trail at the Groton School Pond in Groton, MA | |
| Length | 12.5 mi (20.1 km) |
| Location | Middlesex County, Massachusetts Hillsborough County, New Hampshire |
| Designation | Massachusetts state park |
| Trailheads | Park St. and Main St., Ayer, Massachusetts (42°33′36″N 71°35′23″W / 42.560083°N 71.589646°W) Gilson Rd. at Country Side Dr., Nashua, New Hampshire (42°42′57″N 71°31′55″W / 42.715919°N 71.531963°W) |
| Use | Bicycling, inline skating, walking, horseback riding, cross-country skiing |
| Right of way | Former railroad line |
| Maintained by | Department of Conservation and Recreation |
| Website | Nashua River Rail Trail
  Nashua  Ayer Location of trailheads in New Hampshire and Massachusetts |
The Nashua River Rail Trail is a 12.5-mile (20.1 km) paved mixed-use rail trail in northern Massachusetts and southern New Hampshire under control of the Massachusetts Department of Conservation and Recreation (DCR). It roughly follows the course of the Nashua River, passing through the towns of Ayer, Groton, Pepperell, and Dunstable, Massachusetts and ends about a mile across the New Hampshire state border in Nashua, New Hampshire.[1] The trail is used by walkers, cyclists, inline skaters, equestrians, and cross-country skiers.[2]