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MDI YMCA Fall Half Marathon & 5K

The Mount Desert Island YMCA Fall Half Marathon is the only half marathon that runs through a national park. This September, follow a challenging loop course along Acadia National Park’s historic carriage roads, an excellent running surface far away from cars. For over 40 years, this half marathon has supported the MDI YMCA as their biggest fundraiser of the year. Support local recreation programs and youth development while running a spectacular course through Acadia.