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Half Marathon Calendar near O'Fallon 2025-2026

Explore the top half marathons near O'Fallon for 2025-2026! We've gathered 22 exciting races in the area. Check out our detailed list below to find your next local race.

August 2026
Aug
29
Saturday

The Labor Day Slay

Trail Run 5 km 10 km Half Marathon
September 2026
Sep
26
Saturday

Bodies Race Company - St. Louis

5 km 10 km Half Marathon
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