Mount Desert Island Marathon

OCT
18
2026
An autumn road-race weekend on Mount Desert Island featuring marathon, half marathon, team and public safety relays plus a kids run. The course passes Acadia National Park and Somes Sound with starts in Bar Harbor and Northeast Harbor.
Sun 18 Oct 2026
Marathon Half Marathon

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Mount Desert Island Marathon, Half & Relay

The Mount Desert Island Marathon, Half & Relay is an annual road-race weekend on Mount Desert Island, Maine. The event program includes a marathon, a half-marathon, a team relay, a public safety relay and a kids run. The marathon and team relay start in Bar Harbor, the half-marathon starts in Northeast Harbor, and the main races finish in Southwest Harbor.

The award-winning course passes lakes, mountains, small coastal villages and seaside vistas, including Somes Sound, noted as the only fjord on the Eastern Seaboard. Much of the route runs alongside or near Acadia National Park during peak fall foliage season. The course is USATF certified.

Race weekend programming listed by organizers includes a health and fitness expo and a pre-race pasta dinner, and information for spectators and volunteers is provided. The event is held annually the weekend following Indigenous Peoples' Day and is hosted by Crow Athletics. The race has received national and international recognition from running publications and other organizations. Visit the organization's website for the most recent information.

Marathon
Marathon
Half Marathon
Half-Marathon
Team Relay
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