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Triathlon Calendar near O'Fallon 2026-2027

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Explore the top triathlons near O'Fallon for 2026-2027! We've gathered 2 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
Experience Missouri’s premier multi-sport showdown at Creve Coeur Park with triathlon, duathlon, and aquathlon races for all athletes including a USAT State Championship.
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