370 Lakeside Triathlon
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370 Lakeside Triathlon - Saint Peters, MO
The 370 Lakeside Triathlon takes place on August 23, 2026 at 1000 Lakeside Park Drive in Saint Peters, Missouri. The event is USAT sanctioned and is presented as the sixth annual running of this multisport event. The swim starts from a beach, the bike course uses country roads in St. Charles County, and the run uses park trails inside Lakeside Park.
A variety of race formats are offered across the same day, including triathlon, duathlon, aquabike, aquathlon, relay options and a standalone 5K run. Distances listed for main formats include:
- Super Sprint: 300 meter swim, 23K bike, 2 mile run
- Sprint: 750 meter swim, 23K bike, 5K run
- Olympic: 1.5K swim, 40K bike, 10K run
- Half distance: 1.2 mile swim, 56 mile bike, 13.1 mile run
- Duathlon examples: 2 mile run, 23K bike, 5K run and 5K run, 40K bike, 10K run
- Aquathlon and Aquabike examples: swim 750m or 1.5K plus run or bike as listed
- 5K Run as a separate event
All athletes must show a photo ID and pick up their own race packet; no exceptions are permitted. Visit the organization's website for the most recent information.
