Seafair Triathlon
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Seafair Triathlon

Seattle's only Triathlon

In 2021, the Seafair Triathlon will move from Seward Park to King County’s Eastside and will be located at Lake Sammamish State Park. The triathlon will be anchored at the park but will take place in both Issaquah and Sammamish cities.

We’re excited to host you for the 2021 triathlon and will continue to produce a first class event for all athletes ranging from the beginners to elites all the way down to the little triathletes. Register now and join us for our return to live triathlons!


Official Athletic Club

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