370 Lakeside Triathlon
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370 Lakeside Triathlon
The 370 Lakeside Triathlon takes place on August 23, 2026 in Saint Peters, Missouri at 1000 Lakeside Park Drive. The event is USAT sanctioned and is presented in its 6th year.
The course includes a beach start for the swim. The bike segments use county roads in St. Charles County and the run routes include the park trails. Organizers describe the course as flat and fast. A separate open water swim clinic is scheduled at 370 Lakeside Park on August 22.
A wide range of race formats is offered: sprint, super sprint, Olympic and half distance triathlons, plus duathlon, aquabike, aquathlon, relay options and a 5K run. There are also para divisions and age specific categories such as collegiate and high school events. Many events are open to participants age 14 and older; collegiate entries note an age range of 16 to 24 and high school entries note an age range of 14 to 19.
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.
