Flat Rock Trail Race

The Flat Rock Trail Race takes place on Saturday, June 13, 2026, at 8:00 AM at 510 High Street in Dunstable, Massachusetts. This event benefits the Humane Society for Greater Nashua and features a 6-Hour Race and a 5-Mile Race on a 5-mile loop with nearly 600 feet of elevation gain per lap, passing through the Arched Bridge Conservation Area, a former granite quarry, and the old Blanchard Hill Ski Area.

Event Logistics & Participant Information:

• Registration Deadline: Closes Thursday, June 11, 2026, at 11:59 PM ET.
• Location: Dunstable, Massachusetts. Start at 510 High Street.
• Course: 5-mile loop with nearly 600 feet of elevation gain per lap. Well-marked.
• Course Highlights: Start over the Arched Bridge of the Arched Bridge Conservation Area, down part of the old Nashua, Acton and Boston Railroad bed, around a former granite quarry and farm, then climbing to the tops of the old Blanchard Hill Ski Area and Flat Rock Hill.
• Activity Options: Run, walk, or hike the loop.
• Weather Policy: Race held rain or shine.
• Refund Policy: No refunds or deferrals. Entry fee becomes a donation to the Humane Society for Greater Nashua.
• Volunteers: Signups open in late April. Information on website.
• Permissions: Held with permission from Dunstable Conservation Commission and Dunstable Rural Land Trust. Support from Town of Dunstable.
• Website: Additional race, course, and historical information available on Flat Rock Trail Race website. Facebook group available.

Swag, Awards & Community:

• Charity Beneficiary: Humane Society for Greater Nashua — helps care for pets looking for homes and brings low-cost services to the community.
• Community Support: Organizers ask participants to be great guests to this special conservation area.
• Scenic Setting: Beautiful Dunstable, Massachusetts, with historic conservation land, former railroad bed, granite quarry remains, and ski area hilltops.
• Terrain: Elevation gain per lap nearly 600 feet — climbing to Flat Rock Hill.
• Inclusive: Both distances welcome runners, walkers, and hikers.
• Historical Aspects: Information about course history on race website.
• Top Performances: Results available from 2025.

The Flat Rock Trail Race on June 13, 2026, in Dunstable, Massachusetts, combines a scenic 5-mile loop over historic conservation land, former railroad beds, and ski hill climbs — with every entry supporting the Humane Society for Greater Nashua.