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Triathlon Calendar near Saint Charles 2026-2027

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Explore the top triathlons near Saint Charles for 2026-2027! We've gathered 4 exciting races in the area. Check out our detailed list below to find your next local race.

December 2026
Dec
5
Sa

Castlewood Adventure Race

Multisport 8 HOUR ADVENTURE RACE - S... 5 15 5 mi 8 HOUR ADVENTURE RACE - 2... 5 15 5 mi 8 HOUR ADVENTURE RACE - 3... 5 15 5 mi 8 HOUR ADVENTURE RACE - 4... 5 15 5 mi
An 8 hour off-road adventure race around St Louis combining paddling, mountain biking and navigation by map and compass with solo and team entry options.
June 2027
Jun
1
Tu

St. Louis Triathlon

Triathlon Duathlon Aquathlon Sprint 750 m 5 km Olympic 1 mi 10 km Sprint 750 m 20 km Sprint 750 m 20 5 km
USAT sanctioned triathlon at Creve Coeur Park on June 28, 2026 offering sprint, Olympic, relay and 6K options with an expo and packet pickup the day before.
July 2027
Jul
18
Su

Ballwin Triathlon

Triathlon Sprint 300 m 9 3.4 mi Sprint 300 m 9 3.4 mi 1 m 9 3.4 mi
USAT sanctioned triathlon in Ballwin featuring a 300 yard swim, 9 mile bike and 3.4 mile run with single, relay, and double formats on July 18, 2027.
September 2027
Sep
12
Su

370 Lakeside Triathlon

Triathlon Duathlon Aquathlon Sprint 750 m 5 km Olympic 1.5 10 km Middle distance 1.2 13.1 mi Sprint 750 m 23 km
A USAT‑sanctioned triathlon at 370 Lakeside Park offering distances from a 5K and sprints up to a half triathlon, with a beach swim, country‑road bike courses, and a finish festival.
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