4K Trail Run
Boston, United States • 20-21 May 2026
4K Trail Run
The 4K Trail Run is a sports event held on Cathleen Stone Island within the Boston Harbor. Participants travel to the venue via a 30-minute ferry ride provided as part of the event logistics. The race takes place across two days, and runners or corporate teams must select one specific day to participate.
The event features a single distance held on a trail course:
- 4K
All participants receive a chip-timed entry for the race. The registration package includes round-trip ferry transportation to and from the island, a race t-shirt, and access to an on-island gathering. Following the run, the event provides dinner and beer for the runners.
Proceeds from the registration fees and fundraising efforts support hands-on science learning programs for youth in Boston. The course allows individuals and teams to experience the natural environment of the island while contributing to educational initiatives. The registration period typically opens several months in advance, with specific deadlines for both individual and team entries. Visit the organization's website for the most recent information.