O'Fallon
Triathlon Calendar near O'Fallon 2026-2027
Monthly updates for O'Fallon
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Explore the top triathlons near O'Fallon 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
An eight hour off road adventure race in the St Louis area where teams navigate unmarked terrain by map and compass across paddling, biking and running legs.
June 2027
Lake swim, rolling bike course and mixed-surface run at Innsbrook Resort on June 12, 2027, with sprint and Olympic distances plus relay and aquabike options.
July 2027
A USAT sanctioned pool triathlon in Ballwin on July 19, 2026 with 300 yard swim, 9 mile bike and 3.4 mile run plus single, relay and double options.
September 2027
Experience a USAT sanctioned triathlon at 370 Lakeside Park featuring a beach start, scenic rural bike course, and flat trail run with distances from 5K to Half Triathlon.
Monthly updates for O'Fallon
Get new running races (and updates) in your inbox every month.