370 Lakeside Triathlon
About this race
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.
Join fellow runners on August 17, 2025 for the 370 Lakeside Triathlon. It's a fantastic 5K featuring a flat and fast course in Saint Peters.
Pick your distance
Running
5K RUN
Weather Overview
These values reflect historical conditions on the race dates in Saint Peters in 2025, from Open-Meteo archive data.
About Saint Peters
370 Lakeside Triathlon takes place in Saint Peters, Missouri, United States. The local timezone is America/Chicago.
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Race information has been sourced from the event's official website and other publicly available resources. For the most up-to-date details, please refer to the official website directly. If you notice any incorrect or missing information, don't hesitate to reach out to us by email.
