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.
Pick your distance
Running
5K RUN
Typical race-day weather
Based on 4 years of historical conditions on this event's race dates in Saint Peters.
Course
Route map and elevation profile
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
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Other races near Saint Peters
Different organizers, within 40 miles, in the next three months
Open Water Swim - 370 Lakeside Park
Backyard Ultra in New Town (Oct 10 8:00AM)
Corps of Discovery Trail Races
Taste the Cause Ticket
🏃 Plan Your Next Race in Saint Peters
Find upcoming events by distance:
- Saint Peters 5K Races 2 races
- Saint Peters Running Calendar 2026 2 races
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 3 Saint Peters events
Spotted something wrong? Tell us and we'll fix it.