The Nashua River Rail Trail follows the path of a former railroad corridor through the heart of Middlesex County, tracing a scenic 12.5-mile route from Ayer to Dunstable along the banks of the Nashua River. Built on the old Hollis Branch of the Boston and Maine Railroad, the paved multi-use trail offers one of the most accessible and enjoyable rail-trail experiences in New England.

The trail’s smooth asphalt surface makes it ideal for cycling, jogging, inline skating, and leisurely walks. In winter, cross-country skiers and snowshoers take over the corridor. Along the way, you’ll pass through a mix of wetlands, woodlands, and open meadows, with the Nashua River appearing and disappearing beside you. Birdwatchers should keep an eye out for great blue herons, red-tailed hawks, and kingfishers that frequent the riverbanks and surrounding marshes.

Several trailheads with parking are spaced along the route, making it easy to tackle the full distance or pick a shorter section. The stretch near Groton Center offers convenient access to local shops and cafes for a mid-ride stop. Families particularly appreciate the flat, car-free terrain — it’s one of the best spots in the region for teaching kids to ride.

Fall is the standout season here, when the hardwoods lining the trail erupt in color and the crowds thin after summer. Spring brings wildflowers and migrating birds. Visit on a weekday morning for the quietest experience, though the trail rarely feels overcrowded even on pleasant weekends.

Explore Nearby

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• Burkeville Covered Bridge — Covered Bridge in Massachusetts
• Connecticut River Byway — Scenic Byway in Massachusetts
• Green Mountain National Forest — National Forest in Vermont
• Jarvis Island Light — Lighthouse in New Hampshire