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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

Saturday Jul 11

TARC Blue Hills Skyline Trail Run

Canton

12 km

A 12K trail race on the Blue Hills Skyline Trail with about 2,300 feet of climbing, rocky steep terrain, and minimal aid. The route follows Skyline blazes from the Blue Hills Ski Area parking lot and requires participants to carry hydration..

Saturday Jul 18

12 Hours of Lawrence Woods

Medford

Backyard Ultra

4 mi

A 12-hour timed trail event in Lawrence Woods, Medford, featuring a roughly 4-mile loop, minimal on-course aid, and parking at a nearby high school lot. The start and aid station are located in the woods about a quarter mile from parking.

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.

Saturday Aug 8

Tarc Summer Classic

A trail event at Noon Hill Reservation in Medfield offering a 10 mile loop plus 50K and 40 mile ultra options, mostly singletrack with roots, rocks, and a scenic Noon Hill vista; proceeds benefit The Trustees of Reservations.