370 Lakeside Triathlon

  • Date Sun 23rd August 2026
  • Time 6:45AM CDT
  • Location Saint Peters, Missouri
  • Price $33.63 - $300.50
  • Races 21 races
  • Distances Sprint, Olympic, 5km

Event summary

Get ready to dive into an exhilarating day of athleticism at the 6th annual 370 Lakeside Triathlon on Sunday, August 23, 2026! Set against the stunning backdrop of 370 Lakeside Park in St. Peters, St. Charles, this USAT sanctioned event promises to be an unforgettable experience for participants of all skill levels.

Whether you're a seasoned triathlete or just starting out, there’s a race option for you! Choose from a thrilling variety of distances including a 5k run, a super sprint, a sprint for beginners, and even a half distance challenge. For those looking to mix it up, the event also features duathlon, aquabike, and aquathlon options. With a beach start, scenic country roads, and beautiful park trails, the course is designed to be both fast and flat. Don’t miss out on the fun and camaraderieβ€”mark your calendars and get ready for a day of fitness and community!

Organiser's Description

Join us for the 6th annual USAT sanctioned 370 Lakeside Triathlon! Enjoy the flattest, fastest course starting in beautiful 370 Lakeside Park! Enjoy a beach start, amazing country roads in St. Charles County, and a run that includes the park trails. We offer a variety of race options from a 5k run, super sprint or sprint for newbies, up to half distance along with duathlon, aquabike and aquathlon options!

For more information including course maps, schedule of events, race options, volunteer signup, etc. Please visit - https://www.mseracing.com/370-lakeside-triathlon

All athletes MUST show a Photo ID and pick up their own race packet, NO EXCEPTIONS.

Races

  • Super Sprint Individual Tri

    Incl. $9.36 Fee & Unisex T-Shirt

    Sun 23rd August 2026 (6:45AM CDT)

    $124.36

    300 meter swim 23K bike 2 mile run
  • Sprint Individual Tri

    Incl. $10.04 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:00AM CDT)

    $135.04

    750M swim 23k bike 5k run
  • Sprint Para Tri

    Incl. $8.01 Fee & Unisex Shirt

    Sun 23rd August 2026 (6:45AM CDT)

    $103.01

    750M swim 23k bike 5k run
  • Sprint Collegiate Tri

    Incl. $6.66 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:00AM CDT)

    $81.66

    750 meter swim 23K bike 5k run
  • Sprint High School Tri

    Incl. $6.66 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:00AM CDT)

    $81.66

    750 meter swim 23K bike 5k run
  • Sprint Para My Team Triumph

    Incl. $8.01 Fee & Unisex Shirt

    Sun 23rd August 2026 (6:45AM CDT)

    $103.01

    750M Swim 23k Bike 3.1 mile run
  • Sprint Aquathlon

    Incl. $9.36 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:00AM CDT)

    $124.36

    Swim 750m Run 5K
  • Sprint Aquabike

    Incl. $9.36 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:00AM CDT)

    $124.36

    750M swim 23k bike
  • Sprint Duathlon

    Incl. $9.36 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:30AM CDT)

    $124.36

    2 mile Run | 23k Bike | 5k Run
  • Sprint Relay Tri

    Incl. $14.76 Fee & Unisex Long Sleeve Hooded Shirt

    Sun 23rd August 2026 (7:00AM CDT)

    $209.76

    750M swim 23k bike 5k run
  • Olympic Individual Tri

    Incl. $10.71 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:00AM CDT)

    $145.71

    Swim 1.5k Bike 40k Run 10k
  • Olympic Aquabike

    Incl. $10.04 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:00AM CDT)

    $135.04

    Swim 1.5k Bike 40k
  • Olympic Duathlon

    Incl. $10.04 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:30AM CDT)

    $135.04

    5k Run | 40k Bike | 10k Run
  • Olympic Aquathlon

    Incl. $10.04 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:00AM CDT)

    $135.04

    Swim 1500m Run 10K
  • Olympic Relay Tri

    Incl. $15.78 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:00AM CDT)

    $225.78

    Swim 1.5k Bike 40k Run 10k
  • Half Individual Tri

    Incl. $15.10 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:00AM CDT)

    $215.10

    1.2 mile swim 56 mile bike 13.1 mile run
  • Half Aquabike

    Incl. $12.74 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:00AM CDT)

    $177.74

    Swim 1.2 mile Bike 56 mile
  • Half Duathlon

    Incl. $12.74 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:30AM CDT)

    $177.74

    5k Run | 56 mile bike | 13.1 mile run
  • Half Aquathlon

    Incl. $12.74 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:00AM CDT)

    $177.74

    Swim 1.2 miles Run 13.1 miles
  • Half Relay Tri

    Incl. $20.50 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:00AM CDT)

    $300.50

    1.2 mile swim 56 mile bike 13.1 mile run
  • 5k Run

    Incl. $3.63 Fee & Unisex Shirt

    Sun 23rd August 2026 (7:30AM CDT)

    $33.63

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Location

1000 Lakeside Park Drive, Saint Peters, 63376, MO, United States

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