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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 is a two-day running event held on Cathleen Stone Island in Boston Harbor on May 20 and May 21, 2026. Participants may register as individuals or as part of a team and must select one day to take part.

The race follows a roughly 4-kilometer loop around the island. Each registered runner receives chip-timed entry, round-trip ferry transportation to the island, a race t-shirt, dinner and beer. The ferry to the island is described as a short ride of about 30 minutes. The event includes an on-island gathering after the race.

Funds raised by the event support Cathleen Stone Island’s mission to deliver free, hands on science learning to Boston youth. The event is also used as a corporate fundraising opportunity and offers both individual and team registration options. 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 Apr 30

Women+'s Morning Run in the Fells

Winchester

3 mi

A recurring morning trail run in the Fells for women and nonbinary folks. The group runs a 3 miles loop at a comfortable pace of about 11 to 12 minutes per mile; steady rain or thunder cancels.

Saturday May 9

Run, Walk and Wag for Kids 5K

Easton

3 mi

A dog friendly 5K and a 2.6 mile walk at Borderland State Park on May 9, 2026 to benefit School on Wheels of Massachusetts. The event features refreshments, pup cups, kids pupsicles and free t shirts for early registrants.

Saturday May 16

FBRTC 5K Trail Race

Franklin

5 km

Run or walk a 5k on the Southern New England Trunkline Trail in Franklin. This event supports the development of an abandoned rail bed into a multi use path connecting local communities.

Saturday May 16

Trillium Spring 5k

Canton

5 km

Celebrate the eighth annual Trillium Spring 5K in Canton or participate virtually from anywhere. Join over 500 runners at the brewery to support Girls on the Run Greater Boston with races for adults and children.