4K Trail Run
Decision scores
Six 0–100 scores telling you, at a glance, who this race is for.
Best for
About the Race
Rescheduled: The 4K scheduled for Thursday, May 22nd was postponed due to weather and has been rescheduled for Thursday, June 26. There are additional spots available for individual runners and corporate teams. The new registration deadline is Friday, June 20. The 4K Trail Run is the most unique race in Boston! Taking place on Cathleen Stone Island in the Boston Harbor, teams and individual runners will enjoy an afternoon and evening with their coworkers and friends. After a short ferry ride ...
Course Profile
Course profile data unavailable for this race.
Course features
Accessibility & inclusion
Vibe & community
We don't have vibe tags for this race yet — organizers can claim the listing to add them.
History & past results
Past finisher times and year-over-year participation will appear here once the organizer publishes them.
Reviews
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Common questions
How hard is the 4K Trail Run Other?
We don't have a verified elevation profile yet — check the organizer's course map for the climb breakdown.
What should I wear?
Dress for ~10°F warmer than the standing temperature once you start running. Throwaway long-sleeve at the start, gloves and a hat for sub-50°F mornings, singlet plus visor when it climbs above 60°F. The race-day forecast above is the source of truth closer to the date.
When does it sell out?
No published deadline. Most races raise the entry fee in tiers and can sell out without warning — sign up early if you're committed.
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