Trail

Thompson Island Outward Bound 4K Trail Run

📅 May 19, 2027 (estimated date)📍 Boston · United States

⚠️ 2027 edition: provisional information

The date is estimated from the 2026 edition (May 20, 2026), on the same day of the week. Courses, start times, fees and description are carried over from the previous edition: check them on the official website. This page will be updated as soon as the organizer publishes them.

Available distances

2.5 mi

About

The Thompson Island Outward Bound 4K Trail Run is a 4K trail race (2.5 miles) on Cathleen Stone Island in Boston Harbor, held on May 19 and May 20, 2027, with a 4:00 p.m. start each day. It brings together individual runners and corporate teams.

Participants take a ferry to the island, run the race and then enjoy dinner and evening entertainment. The event supports the mission of Cathleen Stone Island, which provides free science education to Boston youth.

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