Seafair Triathlon Info

The Seafair Triathlon, offers participants multiple disciplines on a flat, fast and picturesque triathlon course only 10 minutes from Downtown Seattle at Seattle’s Seward Park. Seattle’s ONLY Triathlon will once again take over the shores of Lake Washington this summer and Seward Park is the perfect backdrop for this flat, fast and picturesque triathlon course in the shadows of Downtown Seattle.

The event offers participants a unique opportunity to participate in a sprint distance triathlon or super sprint distance in an urban setting. Swimming in warm, calm waters, riding in protected roadways and running through Seward Park, this is the Pacific Northwest’s premier triathlon.

Offering a Kids Tri as well, there is a distance for everyone in the family at the Seafair Triathlon! Join us in 2024 at the Seafair Triathlon with over 1,500 health enthusiasts taking part in the event.


Race Weekend Schedule

Saturday, July 20

What: Saturday Pre-Race Packet Pickup & Body Marking

Where: Seward Park

5900 Lake Washington Blvd, Seattle, WA 98118

Time: 12:30pm – 4:30pm

Sunday, July 21 – RACE DAY!

5:30a.m. – Transition Zone Opens

6:00a.m. – Race Day LATE packet pickup & body marking begins

6:00a.m. – Bike Mechanics Area Opens

7:00a.m. – Sprint Triathlon Course Start
7:21a.m. – Sprint Relay Team Swim Start
7:35a.m. – Duathlon Bike Start

7:48a.m. – Super Sprint Course Start
10:30a.m. – Kids Short Course Start
11:00a.m. – Kids Long Course Start
No Awards Ceremony in 2024 – All awards/finisher certificates will be electronic and downloadable

Included with your race entry:
  • Seafair Triathlon participant shirt
  • 2024 Event Finisher Medal (Adults & Kids!)
  • FREE downloadable participant photos (average of 4+ per participant)
  • Timing Chip, Swim Cap
  • Unique Race Bib

Transition Area
The transition area will be open and supervised starting at 5:30 a.m. on Sunday, July 21. For the safety of all participants, only registered participants will be allowed in the transition area. Participants may leave their personal belongings in this secure area. Please rack your bike on your designated bike rack, which is determined by your race number. Athletes can rack their bikes the morning of the race, Saturday bike racking will not be allowed in 2024. Nobody without a race bib and body marking will be allowed in the transition zone on race day. Bike mechanics will also be located in the transition zone and available to make quick adjustments to your bike before the event.


Race Distances

Sprint Distance Triathlon – 0.5 mile swim, 14-mile bike ride, 5 Kilometer run

Sprint Duathlon – 14-mile bike ride, 5 Kilometer Run

Sprint Distance Relays – Same as the sprint course

Super Sprint Distance Triathlon – 0.25 mile swim, 14-mile bike ride, 5 Kilometer run

Kids Long Course – 100-yard swim, 2-mile bike ride, 1-mile run

Kids Short Course – 50-yard swim, 1-mile bike ride, 0.5 – .75 mile run (swim in water kids can touch in)

*All team participants in the relay category and individual duathlon category will also receive finisher medals after the race

Triathlon Course Map & Information

Swim Course – Counter-clockwise swim in the protected cove of Andrews Bay at Seward Park in Lake Washington (1 full triangular lap for sprint, 1 smaller triangular lap for super sprint) The cove is protected from wind and boats. There will be lifeguards onsite if a rest is needed or to help you safely finish the swim

Bike Course

Sprint Distance, Super Sprint, Relay Teams and Duathlon participants will ride north through along Lake Washington Blvd through multiple waterfront neighborhoods including Leshci, Madrona and Madison Park. All participants will follow LWB, connecting to McGilvra, then looping around the Madison Park neighborhood before returning to Seward Park. With only one hill, this is a fast course for all cyclists!

Run Course – All participants will complete one loop around Seward Park from the swim beach to the south side of Seward Park. Midway through your run, participants will run out and back to the upper loop of Seward Park before finishing at the south parking area where the post run celebration waits! The run course is the same for all Sprint, Super Sprint and Duathlon participants.

Event Parking
There is no parking within Seward Park. All participants are advised to park in the Seward Park neighborhoods and bike to the transition zone. Reminder – Lake Washington Blvd will be closed so please take alternate routes.

Prize Money and Awards
Prize money will be awarded to the top three individuals (male and female) competing in the elite wave of the Sprint Distance Triathlon. Only individuals competing in the elite wave will be eligible to win prize money. Elite athletes are not eligible to win age group awards. There will be no elite category or prize money for individuals competing in the super sprint triathlon.

1st Place – $200 plus free entry to 2025 event
2nd Place – $100 plus free entry to 2025 event
3rd Place – Free entry for 2025 Seafair Triathlon

Age Group Awards and Event Finishers will be recognized by online race results and will have the opportunity to download electronic finisher certificates and age group certificates.

To be placed in the elite wave, please send us your past three finish times, race distances and overall placing to

Seafair Triathlon Training Clinics & Coaching Opportunities

Seafair is excited to partner with TN Multisports to offer advanced training opportunities for the Seafair Triathlon. Whether you’re new to the triathlon world or a seasoned vet wanting to improve a specific discipline, we’ve got a training package that will help you meet your goals!

Teresa and Mark Webb of TN Multisports are USAT Level II and Level I Tri Coaches and the Tri Coach of Washington Athletic Club (WAC). For additional questions regarding the clinics, check out their website or email him at: 

For more information and how to sign up, click the links below:

Adult Clinics Include The Following:

Costs vary for each of the adult clinics, please click the individual clinic above for more information, pricing and more!

NEW! Youth Triathlete Clinic Options Include:

*These youth clinics are meant for youths age 12+ that are training, or want to train, to complete in the full sprint triathlon (In the Friends & Family Wave). Friends & Family wave is a great way to introduce the younger athlete to the world of triathlons in a much more friendly, less stressful environment.