370 Lakeside Triathlon
- Date
- August 23, 2026
- Distance
- SUPER SPRINT INDIVIDUAL TRI · SPRINT INDIVIDUAL TRI · SPRINT PARA TRI & more
From the Organizer
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.
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
87°
Typical Low
65°
Chance of Rain
27%
Based on US Climate Normals data from St Peters 2 Se, 2 mi from the venue.
Host City
About Saint Peters, MO
Population
58,200
as of 2023
Elevation
493 ft
Nearest Airport
STL
St. Louis Lambert International Airport · 14 mi
Time Zone
Central Time
From Endurance Grid
A mid-size host city. Enough lodging and amenities to keep race weekend easy, without big-city sprawl.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at 370 Lakeside Triathlon, put it on the calendar, and turn “someday” into a start date.
76
Days to train
- Race
- 370 Lakeside Triathlon
- Date
- August 23, 2026
Coming Up
More Triathlon races near Saint Peters, MO
Chesterfield Youth Triathlon
Youth
9 miles away
St. Louis Triathlon
21 miles away
St. Luke's New Town Triathlon
5 miles away
MTC Zilla Tri
33 miles away
From Endurance Grid
About This Sport
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
Three sports, one race — swim, bike, run in sequence, with transitions that are a discipline of their own.
Open water, open roads, and competition with yourself. Cross the finish line knowing what it took to get there.
Triathlon
Swim, bike, run — back to back. The sprint distance makes it far more accessible than most people think.
Frequently Asked Questions (FAQs)
- What is the 370 Lakeside Triathlon?
- 370 Lakeside Triathlon is a triathlon race held in Saint Peters, Missouri on August 23, 2026. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more triathlon races near you or explore our sports guides to learn what race day actually feels like.
- When and where is the 370 Lakeside Triathlon?
- Sunday, August 23, 2026 in Saint Peters, Missouri at 1000 Lakeside Park Drive, Saint Peters, MO. Check the event page for exact start times and wave schedules.
- How do I register for the 370 Lakeside Triathlon?
- Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.
370 Lakeside Triathlon
Aug 23, 2026