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4K Trail Run

Name: 4K Trail Run
Start: 2026-05-20
End: 2026-05-21
Location: Boston

Boston, United States • 20-21 May 2026

4K Trail Run

The 4K Trail Run takes place on Cathleen Stone Island in Boston Harbor on May 20 and May 21, 2026. The event offers separate entries for teams and individual runners; each participant selects one of the two event days. After a short ferry ride (about 30 minutes) to the island, participants run a 4K loop around the island.

Each entry includes chip-timed race participation, round trip ferry transportation, a race t-shirt, and an on-site meal with beer. The day concludes with an on-island gathering. Funds raised by the event support Cathleen Stone Island’s mission to deliver free, hands-on science learning to Boston youth. The event is organized as a fundraising activity that brings together workplace teams and individual runners for a race, transportation, post-race meal, and island event. Visit the organization's website for the most recent information.

United States Massachusetts Boston

Race information

Registration

4k Trail Run

Visit the organization's website for the most recent information.

Trail runs nearby

Thursday Jul 9

Women+'s Morning Run in the Fells

Winchester

3 mi

Group trail runs for women and nonbinary people in the Fells. A 3 mile loop at a conversational 11 to 12 minutes per mile pace, held in person at the North Reservoir; steady rain or thunder cancels.

Saturday Jul 11

TARC Blue Hills Skyline Trail Run

Canton

12 km

An old school 12K trail run at Blue Hills Reservation with about 2,300 feet of climbing over rocky, steep terrain and staircase sections. Minimal aid and a 150 participant limit mean participants are expected to carry hydration.

Saturday Jul 18

12 Hours of Lawrence Woods

Medford

Backyard Ultra

A 12 hour loop run in Lawrence Woods, Medford, MA on July 18, 2026. The roughly four mile loop has minimal aid and space for participants to set up personal stations near the course.

Thursday Aug 6

Nantasket Beach Run

Nantasket Beach

4 mi

A four mile beach run at low tide on Nantasket Beach in Hull, Massachusetts. The out and back course starts near the Mary Jeanette Murray Bath House and raises funds for Hull Boosters and The Emma Ryan Memorial Fund.