Mount Desert Island Marathon

OCT
18
2026
A fall road race on Mount Desert Island with a marathon, half marathon and relays that run through terrain around Acadia National Park and Somes Sound. Starts include Bar Harbor and Northeast Harbor with finishes in Southwest Harbor.
Sun 18 Oct 2026
Marathon Half Marathon

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Mount Desert Island Marathon, Half & Relay

The Mount Desert Island event offers multiple road races on Mount Desert Island, set against the backdrop of Acadia National Park during peak fall foliage season. The course passes lakes, mountains, small villages and seaside vistas including Somes Sound, described in the event material as the only fjord on the Eastern Seaboard.

Race formats listed by the organizer include:

  • Marathon
  • Half Marathon
  • Team Relay and Public Safety Relay
  • Kids Run

The Marathon and Team Relay start in Bar Harbor. The Half Marathon starts in Northeast Harbor. All three primary races finish on the quiet side of Mount Desert Island in the maritime community of Southwest Harbor.

The event is held annually the weekend following Indigenous Peoples Day and is presented by the host running club. The organizer notes the race has received national and international accolades and several awards in past years. Visit the organization's website for the most recent information.

Marathon
Marathon
Half Marathon
Half Marathon
Team Relay
Public Safety Relay
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