ÖTILLÖ Casco Bay USA

AUG
9
2026
The ÖTILLÖ Casco Bay USA is a swimrun event through the islands of Maine's Casco Bay. It offers three distances combining ocean swims and island trail runs. This race is noted as the first official swimrun event in the United States.
Sun 9 Aug 2026
Casco Bay Experience Casco Bay Sprint Casco Bay World Series

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Event Details

The ÖTILLÖ Casco Bay USA swimrun event takes place in the Casco Bay Islands off the coast of Portland, Maine. It is described as the birthplace of America's first official swimrun. The course involves saltwater ocean swims and runs that connect islands in the bay, with features like changing tides, island hopping, and rock scrambles.

Race Distances

There are three race distances.

  • Casco Bay Experience: Total distance 9,705m (Swim 1,635m, Run 8,070m)
  • Casco Bay Sprint: Total distance 16,930m (Swim 3,230m, Run 13,700m)
  • Casco Bay World Series: Total distance 35,165m (Swim 7,940m, Run 27,225m)

Course and Logistics

The event uses ferries for athlete transport to the start lines. The World Series course starts on Chebeague Island. The Sprint and Experience courses start on Great Diamond Island. All races finish at the Peaks Island Lion’s Club. Awards are given to the top three in specific categories for the World Series and Sprint distances, but not for the Experience distance. The event has course cut-off times for safety.

Mandatory Gear

All participants must have specific gear. Mandatory athlete-provided items include shoes, a wetsuit, a whistle, a compression bandage, and for teams, a tether. The race provides items like a swim cap, a number bib, and for solo racers, a personal flotation device. Visit the organization's website for the most recent information.

35 km
Casco Bay World Series
16 km
Casco Bay Sprint
9 km
Casco Bay Experience