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
Triathlon
SUPER SPRINT INDIVIDUAL TRI
300 meter swim 23K bike 2 mile run
SPRINT INDIVIDUAL TRI
750M swim 23k bike 5k run
SPRINT PARA TRI
750M swim 23k bike 5k run
SPRINT COLLEGIATE TRI
750 meter swim 23K bike 5k run
SPRINT HIGH SCHOOL TRI
750 meter swim 23K bike 5k run
SPRINT PARA MY TEAM TRIUMPH
750M Swim 23k Bike 3.1 mile run
SPRINT RELAY TRI
750M swim 23k bike 5k run
OLYMPIC INDIVIDUAL TRI
Swim 1.5k Bike 40k Run 10k
OLYMPIC RELAY TRI
Swim 1.5k Bike 40k Run 10k
HALF INDIVIDUAL TRI
1.2 mile swim 56 mile bike 13.1 mile run
HALF RELAY TRI
1.2 mile swim 56 mile bike 13.1 mile run
Swimrun
SPRINT AQUATHLON
Swim 750m Run 5K
OLYMPIC AQUATHLON
Swim 1500m Run 10K
HALF AQUATHLON
Swim 1.2 miles Run 13.1 miles
Aquabike
SPRINT AQUABIKE
750M swim 23k bike
OLYMPIC AQUABIKE
Swim 1.5k Bike 40k
HALF AQUABIKE
Swim 1.2 mile Bike 56 mile
Duathlon
SPRINT DUATHLON
2 mile Run | 23k Bike | 5k Run
OLYMPIC DUATHLON
5k Run | 40k Bike | 10k Run
HALF DUATHLON
5k Run | 56 mile bike | 13.1 mile run
Running
5K RUN
Typical race-day weather
Based on 5 years of Open-Meteo archive data for this event's race dates in Saint Peters, plus the 3 days either side.
The sun rises at 6:41 AM and sets at 7:16 PM local time (CDT) in Saint Peters on September 12, 2027 — 12h 34m of daylight.
Course
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.
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Other races near Saint Peters
Different organizers, within 40 miles, in the next three months
Backyard Ultra in New Town (Oct 10 8:00AM)
Jingle Bell Run - St. Louis, MO
Yadi's Yummies' Barktoberfest new 5K & 1-mile Walk & Wag in the Park
Run Witch Run
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.