Triathlons in Missouri
Missouri has 11 upcoming triathlons scheduled for 2026. Saint Louis is the busiest city with 4 races, ahead of Smithville (2) and Saint Peters (2).
Showing all 11
Triathlon
Matt Mason Cowboy Up Triathlon & Duathlon
Smithville, MO
Triathlon
Matt Mason Cowboy Up Triathlon & Duathlon
July 26, 2026
Smithville, MO
Triathlon
Tour de Kirkwood Triathlon
Saint Louis, MO
Triathlon
Tour de Kirkwood Triathlon
August 1, 2026
Saint Louis, MO
Triathlon
Clayton Kids Triathlon
Clayton, MO
Triathlon
Clayton Kids Triathlon
August 16, 2026
Clayton, MO
Triathlon
The Inkwell Clayton Kids Triathlon
Saint Louis, MO
Triathlon
The Inkwell Clayton Kids Triathlon
August 23, 2026
Saint Louis, MO
Triathlon
370 Lakeside Triathlon
Saint Peters, MO
Triathlon
370 Lakeside Triathlon
August 29, 2026
Saint Peters, MO
Frequently asked questions
What are the standard triathlon distances?▾
The main distances are Sprint (750m swim, 20K bike, 5K run), Olympic (1.5K swim, 40K bike, 10K run), Half-Ironman/70.3 (1.2mi swim, 56mi bike, 13.1mi run), and full Ironman (2.4mi swim, 112mi bike, 26.2mi run). Browse all distances on RACE.
What do I need for my first triathlon?▾
At minimum you need a swimsuit, goggles, a road or tri bike, helmet, running shoes, and a race belt for your number. Many beginners start with a sprint triathlon, which can be completed in 1-2 hours.
What is the difference between sprint and Olympic triathlon?▾
A sprint triathlon is roughly half the distance of an Olympic triathlon. Sprints typically take 1-1.5 hours while Olympic distance races take 2-3.5 hours. Sprints are ideal for beginners.
How do I qualify for the IRONMAN World Championship?▾
Athletes qualify by earning a slot at an IRONMAN-branded qualifying race. Each full IRONMAN event allocates slots to age group winners. The World Championship is held annually in Kailua-Kona, Hawaii.
What are the biggest triathlons in the US?▾
The SuperTri Chicago Triathlon is the largest single triathlon event with 8,000+ athletes. IRONMAN events in Texas, Florida, Lake Placid, and Arizona draw thousands. Escape From Alcatraz is a bucket-list race. Find them all on RACE.