370 Lakeside Triathlon

The 5th annual 370 Lakeside Triathlon returns to the scenic 500-acre 370 Lakeside Park in Saint Peters, Missouri, offering one of the flattest and fastest USAT sanctioned triathlon courses in the region. This comprehensive event caters to athletes of all levels with multiple race options including Super Sprint, Sprint, Olympic, and Half Distance triathlons, plus Duathlon, Aquabike, Aquathlon, and 5K run options. The race features a beautiful beach start on the 140-acre recreational lake, followed by a fast bike course through the country roads of St. Charles County, and finishing with a run on flat park trails. Organized by MSE Racing, the event includes collegiate, high school, and para divisions, making it truly inclusive for the entire triathlon community. All participants receive a race t-shirt and finisher medal, with live race results, professional race photos, and a post-race celebration featuring music, food, and drinks. The park provides ample parking and facilities, with awards presented to top finishers across all categories. Whether you are a first-time triathlete or seasoned competitor, this event offers a premier triathlon experience in the heart of Missouri.