TSR Trail Half Marathon
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TSR Trail Race
The TSR Trail Race takes place on June 21, 2026, in Adams, Massachusetts, north of the Greylock Glen and near Mount Greylock. The course is organized by the Thunderbolt Ski Runners and is held on trails around Gould Road.
This year's run is presented as a loop format. The exact loop distance is still being determined, and participants can choose to run one, two, or three loops where offered. Registration materials also list specific course options and a separate gravel meadow loop.
The terrain uses singletrack mountain biking and hiking trails that are both hand built and machine built. Runners encounter a mix of ascents, descents, and smoother flat sections along these trails. One course option is a gravel meadow loop used for a roughly 5 km outing, described as two laps around the meadow.
Distances reported in event categories include:
- 10 km loop, repeatable one to three times
- 5 km or 10 km loop options, repeatable one to three times
- 5 km(ish) gravel meadow loop, two laps
All proceeds from the event support trail stewardship provided by the Thunderbolt Ski Runners for mountain bike and ski trails around Greylock Glen and Mount Greylock. Visit the organization's website for the most recent information.
