Register for the 2021 Seafair Triathlon

Welcome to the 2021 Seafair Triathlon! 

Each participant of the Seafair Triathlon, with entry, will receive a participant shirt, finisher medal, and personalized bib! 

The Northwest's premier triathlon will take place on the shores of Lake Sammamish at Lake Sammamish State Park. Offering participants multiple disciplines on a flat, fast and picturesque triathlon course throughout Lake Sammamish, Issaquah and Sammamish. This race is a must do for all triathletes in the northwest. 

The event offers participants a unique opportunity to participate in a sprint distance triathlon or super sprint distance in an urban setting. Swimming in a protected cove, riding on closed roadways and running through Lake Sammamish State Park, this is the Pacific Northwest’s premier triathlon. 

Offering a Kids Triathlon as well, there is a distance for everyone in the family at the Seafair Triathlon! Join us in 2021 at the Seafair Triathlon with over 1,400 health enthusiasts taking part in the event.

Online registration for this event is currently closed

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