370 Lakeside Triathlon

370 Lakeside Triathlon

The 370 Lakeside Triathlon takes place on Sunday, August 23, 2026, in Saint Peters, MO. This USAT-sanctioned event features a variety of race options to suit different experience levels, from super sprint and sprint triathlons to half-distance triathlons, as well as duathlon, aquabike, and aquathlon options. A 5k run is also available. The race starts in beautiful 370 Lakeside Park and includes a beach start, flat and fast country roads, and park trails.

Events:

• SUPER SPRINT INDIVIDUAL TRI
• SPRINT INDIVIDUAL TRI
• SPRINT PARA TRI
• SPRINT COLLEGIATE TRI
• SPRINT HIGH SCHOOL TRI
• SPRINT PARA MY TEAM TRIUMPH
• SPRINT AQUATHLON
• SPRINT AQUABIKE
• SPRINT DUATHLON
• SPRINT RELAY TRI
• OLYMPIC INDIVIDUAL TRI
• OLYMPIC AQUABIKE
• OLYMPIC DUATHLON
• OLYMPIC AQUATHLON
• OLYMPIC RELAY TRI
• HALF INDIVIDUAL TRI
• HALF AQUABIKE
• HALF DUATHLON
• HALF AQUATHLON
• HALF RELAY TRI
• 5K RUN

For more information, including course maps and schedules, visit https://www.mseracing.com/370-lakeside-triathlon