1 duathlon event in Saint Peters, Missouri

From big races to Saturday morning group runs—find duathlon events and connect with the local endurance sports community.

• 370 Lakeside Triathlon [mseracing.com] [Register at runsignup.com]
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  Sun, Aug 23, 2026 at 6:45 AM

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  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....

  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.

  5k Aquabike Aquathlon Cycling Duathlon Run Swim Trail Triathlon

  370 Lakeside Park, Saint Peters, Missouri, 63376, United States
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