Seafair Triathlon

Sun, Jul 19, 2026, 7:00 AM PDT

Location: Seattle, WA; 5900 Lake Washington Blvd S, 98118
Type: TRIATHLON

At a glance

Double-check key details

Experience Seattle's premier urban triathlon on a flat, fast, and picturesque course along Lake Washington, welcoming all ages and skill levels.

Fun
Scenic
Competitive

Welcome to Seattle's only triathlon, the Seafair Triathlon, set on the picturesque shores of Lake Washington at Seward Park. This premier event offers a flat, fast course with stunning views of downtown Seattle, making it a must-do for triathletes across the Pacific Northwest. With sprint and super sprint distances, plus a Kids Triathlon, there's an opportunity for every family member to participate. Join over 1,800 health enthusiasts for a unique urban triathlon experience.

What to expect

Swim in a protected cove on Lake Washington.
Bike on closed roadways with downtown Seattle views.
Run through scenic Seward Park on a flat, fast course.

Standout details

Seattle's only triathlon
Flat, fast, and picturesque course
Urban setting along Lake Washington
Kids Triathlon available

Auto-drafted from the public listing — confirm details on the official event page before signing up.

Distances & registration

7 options

Registration for all distances is through the official signup link above.

Sprint Triathlon
Sun, Jul 19, 7:00 AM PDT · From $94.76
Opens Feb 2, 2026, 12:00 AM PST · Closes Jul 19, 2026, 7:59 PM PDT
Super Sprint Triathlon
Sun, Jul 19, 7:00 AM PDT · From $94.76
Opens Feb 2, 2026, 12:00 AM PST · Closes Jul 19, 2026, 7:59 PM PDT
3 Person Sprint Relay
Sun, Jul 19, 7:00 AM PDT · From $105.72
Opens Feb 2, 2026, 12:00 AM PST · Closes Jul 19, 2026, 8:00 AM PDT

+ 4 more options

2 Person Sprint Relay
Sun, Jul 19, 7:00 AM PDT · From $100.24
Opens Feb 2, 2026, 12:00 AM PST · Closes Jul 19, 2026, 8:00 AM PDT
Sprint Duathlon
Sun, Jul 19, 7:00 AM PDT · From $78.32
Opens Feb 2, 2026, 12:00 AM PST · Closes Jul 19, 2026, 7:59 PM PDT
Kids Triathlon - Long Course
Sun, Jul 19, 11:00 AM PDT · From $34.48
Opens Feb 2, 2026, 12:00 AM PST · Closes Jul 19, 2026, 7:35 AM PDT
Kids Triathlon - Short Course
Sun, Jul 19, 11:00 AM PDT · From $34.48
Opens Feb 2, 2026, 12:00 AM PST · Closes Jul 19, 2026, 7:45 AM PDT

The course

Hilly
Timed race

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.

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