370 Lakeside Triathlon
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Event overview
The 370 Lakeside Triathlon is scheduled for Sunday, August 23, 2026, and is USAT sanctioned. The event offers a wide range of race options, from short to long distances, plus a separate 5K run. Events listed include super sprint, sprint, Olympic and half-distance triathlons, relays, duathlons, aquabike and aquathlon formats, para divisions, collegiate and high school divisions, and a 5K run. An open water swim clinic is scheduled the day before the main event at 370 Lakeside Park. Most race options are open to athletes aged 14 and older; the collegiate division is for ages 16 to 24 and the high school division is for ages 14 to 19.
Location and race logistics
The venue is 370 Lakeside Park, 1000 Lakeside Park Drive, Saint Peters, MO 63376. The swim start is from the beach at the park. Course descriptions note sections on county roads in St. Charles County and a run portion that uses park trails. All athletes must show a photo ID and pick up their own race packet; no exceptions are allowed. Visit the organization's website for the most recent information.
