Champlain Islands Marathon and Half Marathon

The Champlain Islands Marathon and Half Marathon, organized by the Green Mountain Athletic Association (GMAA), is set to take place on October 19, 2025. This event features a certified marathon and half-marathon course that begins and ends near the historic home of Clarence H. DeMar, a seven-time Boston Marathon winner.

The half-marathon follows a scenic out-and-back route along the west shore of South Hero and Grand Isle, showcasing beautiful landscapes of farms and apple orchards. The marathon consists of two laps of the half-marathon course, providing a flat to rolling terrain for participants. Visit the organization's website for the most recent information.