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.
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
78°
Typical Low
58°
Chance of Rain
12%
Based on US Climate Normals data from Seattle Boeing Fld, 4 mi from the venue.
Host City
About Seattle, WA
Population
741,440
as of 2023
Elevation
40 ft
Nearest Airport
SEA
Seattle–Tacoma International Airport · 10 mi
Time Zone
Pacific Time
From Endurance Grid
A big city race. Expect multiple lodging options and plenty to do the day before.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at Seafair Triathlon, put it on the calendar, and turn “someday” into a start date.
41
Days to train
- Race
- Seafair Triathlon
- Date
- July 19, 2026
Coming Up
More Triathlon races near Seattle, WA
HAGG Lake Triathlon & Multi-Sports Festival
154 miles away
Black Diamond Triathlon
27 miles away
Righteous Richland Sprint Triathlon
Sprint
169 miles away
Lake Tye Triathlon - 2026
25 miles away
From Endurance Grid
About This Sport
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.
Frequently Asked Questions (FAQs)
- What is the Seafair Triathlon?
- Seafair Triathlon is a triathlon race held in Seattle, Washington on July 19, 2026. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more triathlon races near you or explore our sports guides to learn what race day actually feels like.
- When and where is the Seafair Triathlon?
- Sunday, July 19, 2026 in Seattle, Washington at 5900 Lake Washington Blvd S, Seattle, WA. Check the event page for exact start times and wave schedules.
- How do I register for the Seafair Triathlon?
- Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.
Seafair Triathlon
Jul 19, 2026