Seafair Triathlon

JUL
19
2026
Experience Seattle's premier urban triathlon at Seward Park with flat and fast courses along the shores of Lake Washington. Choose from sprint, super sprint, or youth distances in a scenic setting near downtown.
Sun 19 Jul 2026
Kids Triathlon - Long Cou... Kids Triathlon - Short Co... Sprint Duathlon Run Sprint Triathlon Run Super Sprint Triathlon Ru...

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Event Overview

The Seafair Triathlon takes place at Seward Park in Seattle, on the shores of Lake Washington. The event features a flat and fast course roughly 10 minutes from downtown Seattle. Participants swim in the protected waters of Andrews Bay, ride on closed roadways, and run through the park's scenic pathways.

Available Distances

The event includes several categories and distances for adults and children:

  • Sprint Triathlon: 0.5 mile swim, 20 km bike, and 5 km run.
  • Sprint Duathlon: 20 km bike and 5 km run.
  • Super Sprint Triathlon: 0.25 mile swim, 20 km bike, and 5 km run.
  • Kids Long Course: 100 yard swim, 2 mile bike, and 1 mile run.
  • Kids Short Course: 50 yard swim, 1 mile bike, and 0.5 to 0.75 mile run.
  • Sprint Relay: Available for teams of 2 or 3 people.

Course Details

The swim occurs in a counter-clockwise direction within a cove protected from wind and motorized boats. Lifeguards are present on-site during the swim. The bike course travels north from Seward Park along Lake Washington Blvd, passing through the neighborhoods of Leschi, Madrona, and Madison Park. The route is mostly flat with one hill. The run follows a loop around Seward Park, including an out-and-back section on the upper loop.

Participant Information

Registered athletes have access to a supervised transition area. Bike mechanics are available on-site for pre-race adjustments. Participants receive an event shirt, a finisher medal, a swim cap, and a timing chip. Professional race photos are provided for digital download after the event. Visit the organization's website for the most recent information.

5 km
Sprint Duathlon Run
5 km
Sprint Triathlon Run
5 km
Super Sprint Triathlon Run
Kids Triathlon - Long Course Run
Kids Triathlon - Short Course Run