Sunday, August 17

370 Lakeside Triathlon

Experience the thrill of the 5th annual 370 Lakeside Triathlon on Sunday, August 17, 2025, in scenic St. Peters, St. Charles. This USAT sanctioned event offers a memorable day of racing on a flat and fast course starting at the stunning 370 Lakeside Park. From a refreshing beach start to a picturesque ride through St. Charles County's country roads and a thrilling run on park trails, athletes of all levels will find their perfect challenge. With race options ranging from a 5K run to a half-distance triathlon, as well as duathlon, aquabike, and aquathlon formats, there's something for everyone. Join us for a day of athletic camaraderie and community spirit - don't miss out on creating unforgettable memories at the 370 Lakeside Triathlon! Remember to bring your photo ID for packet pickup and get ready for an epic race day!