Seafair Triathlon Registration

Prices & Increase Dates:

EventThru 4/12Thru 5/24Thru 6/28Thru 7/197/20 & 7/21
Sprint Triathlon$85$95$105$110$125
Super Sprint Triathlon$80$90$100$105$120
3-Person Sprint Relay$95$105$115$120$135
2-Person Sprint Relay$90$100$110$115$130
Sprint Duathlon$70$80$90$95$105
Kids Long Course Tri$30$30$35$35$40
Kids Short Course Tri$30$30$35$35$40


Once again, the best triathlon in the northwest will return to the shores of Lake Washington at Seattle’s Seward Park and feature multiple adult disciplines as well as the popular Seafair Kids Tri! See you July 21.

Registration Options

Option 1 – Register Online

Online registration for the Seafair Triathlon will be available until the start of the race on July 21st with the price increases listed above. There is no in-person registration option.

Option 2 – Saturday Pre-Race Packet Pick Up & Registration

Date: Saturday, July 20, 2024

Time: 12:30pm – 4:30pm

Location: Seward Park

5900 Lake Washington Blvd, Seattle, WA 98118

Participants will pick up all necessary equipment for race day including their timing chip, discipline bibs, swim caps and will have the opportunity to get your body marking done before race day. There will be no early bike racking in 2024.

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

10 Week Seafair Tri Training Plan
With the 10 week training plan, you’ll receive a full training plan to build you up to race day incuding swim clinics, brick workoutes, discounted tri gear, training plans and more!

3 Series Seafair Tri Clinic
The 3 series tri clinic includes group workouts, individual workout options, discounted tri gear and more!

Seafair Tri Transition/Open Water Clinic
Join us for a group open water swim and transition zone setup clinic taking place at Seward Park. Here you’ll get tips and tricks on how to complete the swim portion of a triathlon and how to transition quickly from one discipline to the next.

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: 

Elite Wave Entries:

To be placed in the elite wave, please send us your past three finish times (comparable distance) and overall placing to for consideration. Those placed in the elite wave WILL NOT be eligible to win age group awards, only prize money. The elite wave is for the Sprint Distance Triathlon only.

2022 Seafair Triathlon Race Results & Photos – HERE

2021 Seafair Triathlon Race Results & Photos – HERE

2019 Seafair Triathlon Race Results & Photos – HERE

2018 Seafair Triathlon Race Results – HERE & Photos HERE