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Rescheduled: The 4K scheduled for Thursday, May 22nd was postponed due to weather and has been rescheduled for Thursday, June 26. There are additional spots available for individual runners and corporate teams. The new registration deadline is Friday, June 20.
The 4K Trail Run is the most unique race in Boston! Taking place on Cathleen Stone Island in the Boston Harbor, teams and individual runners will enjoy an afternoon and evening with their coworkers and friends. After a short ferry ride (~30 minutes) to the island, the event will kick off with a 4K race through the island and end with dinner, beer, and an on-island party.
Every dollar raised from the 4K Trail Run supports Cathleen Stone Island's mission to deliver free, hands-on science learning to Boston's youth. The 4K Trail Run is an excellent way to invest in education of Boston youth and is our most popular corporate fundraising event. This year’s 4K Trail Run will take place on Wednesday, May 21st, and Thursday, May 22nd, 2025 (Teams and runners must select one day to participate).
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