Seafair Triathlon
- Date
- July 19, 2026
- Distance
- Sprint Triathlon · Super Sprint Triathlon · 3 Person Sprint Relay & more
From the Organizer
Welcome to the Seafair Triathlon!
Seattle's only triathlon will once again take place on the shores of Lake Washington at Seward Park. Offering participants multiple disciplines on a flat, fast and picturesque triathlon course in the shadows of downtown Seattle. 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 Seward 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 July for the Seafair Triathlon with over 1,800 health enthusiasts taking part in the event.
Distances & Pricing
Race Location
About This Sport
From Endurance Grid's Founder
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
Three sports, one race — swim, bike, run in sequence, with transitions that are a discipline of their own.
Open water, open roads, and competition with yourself. Cross the finish line knowing what it took to get there.
Triathlon
Swim, bike, run — back to back. The sprint distance makes it far more accessible than most people think.
Coming Up
More triathlon races in WA
Summer Block Party Series with Fleet Feet Tri-Cities
Black Diamond Triathlon
Righteous Richland Sprint Triathlon
Sprint
2026 Bonney Lake Triathlon
Frequently Asked Questions (FAQs)
- What is the Seafair Triathlon?
- Seafair Triathlon is a triathlon event held in Seattle, WA. Learn more about the different endurance sports here.
- When and where is the Seafair Triathlon?
- Sunday, July 19, 2026 in Seattle, WA at 5900 Lake Washington Blvd S, Seattle, WA. Check the official event page for exact start times and wave schedules.
- How do I register for the Seafair Triathlon?
- Registration is handled through their official registration page. Confirm pricing, distances available, and sign up there.
Seafair Triathlon
Jul 19, 2026