In 351 days · Sun, Sep 12, 2027
Don't let race day sneak up
One email during race week. That's it.
Sunday, September 12th, 2027
1000 Lakeside Park Drive, Saint Peters MO
5K
69–85°F · some rain risk
See last 10 years
On this date: rain 1 of the last 10 years
2025
67–85°F
dry
2024
57–84°F
dry
2023
78–96°F
dry
2022
67–83°F
dry
2021
72–94°F
dry
2020
69–90°F
dry
2019
67–82°F
dry
2018
60–79°F
dry
2017
61–77°F
dry
2016
65–76°F
rain
Best months to race in Missouri →
Race-day forecast · Sunday, Sep 12
Cloudy · 61–84°F
Sunday, Sep 12starts near 61°F · 0% chance of rain · wind up to 10 mph
About this race
Event Overview
- Event Name: 370 Lakeside Triathlon
- Date: September 12, 2027
- Location: 1000 Lakeside Park Drive, Saint Peters, MO
- Race URL: Click here for registration and details
Race Highlights
- Annual Event: 6th annual USAT sanctioned triathlon
- Course: Flattest, fastest course starting in beautiful 370 Lakeside Park
- Start: Beach start
- Scenery: Amazing country roads in St. Charles County and park trails for the run
Race Options
- Variety: 5k run, super sprint, sprint for newbies, and half distance
- Additional Events: Duathlon, aquabike, and aquathlon options available
- Inclusivity: Open to participants of all skill levels
Important Information
- ID Requirement: All athletes MUST show a Photo ID
- Packet Pickup: Must pick up their own race packet, NO EXCEPTIONS
- More Details: For course maps, schedule of events, race options, volunteer signup, etc., please visit - https://www.mseracing.com/370-lakeside-triathlon
Course map
Hotels for race weekend
Live prices near the start line, Sep 11 – 13, 2027.
Train with a club
Run clubs near Saint Peters to train with before race day.
Suggested Races
Organize this race?
Claim it free to manage your listing — and get it featured for free, while spots last.