Race for the Refuge

SEP
27
2026
Trail races and a 6 hour timed event through Assabet River National Wildlife Refuge with aid stations, cupless rules, pacer options, and proceeds supporting refuge projects.
Sun 27 Sep 2026
6 hour 30 kilometers 10 kilometers

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About the race

The Race for the Refuge is a trail running event at the Assabet River National Wildlife Refuge in Sudbury, MA. The course uses the ARNWR Visitor’s Center as the start and finish area and leads runners past ponds, through pine and oak forests, and alongside former military bunkers. Trails are mostly double track with dirt and gravel surfaces.

The event program includes multiple options:

  • 10K: one loop of the course.
  • 30K: three loops of the course.
  • 6 hour: timed event where runners complete as many loops as desired.

The 6 hour event counts only loops completed before the event cutoff; runners must begin their final lap with enough time to finish it. Pacers are allowed for the 6 hour event, may join later in the day, must register and check in to receive a pacer bib, and may use the aid stations at no cost. One pacer at a time per runner; no muling.

There will be two aid stations with water, hydration mix, pretzels, orange slices, banana halves, Swedish fish, coke, and ginger ale. This is a cupless race; participants must carry and pack out any fuel or trash. Dogs are not permitted on refuge lands and children must be supervised. Entry fees are nonrefundable and support refuge improvements, a volunteer coordinator, and local charities. Runners receive swag and top finishers in each event will receive prizes. Visit the organization's website for the most recent information.

6 hr
Pacer for 6-Hour Race
30 km
30k Trail Race
10 km
10k Trail Race
6-Hour Trail Race
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