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Half marathons in St. Charles County (2026-27)
Updated
1 half marathon is coming up in St. Charles County in the next 90 days; the next is MO' Cowbell Marathon/Half-Marathon/10K/5K on Sunday, November 8 in Saint Charles. 4 half marathons are listed in St. Charles County for the next 12 months; the next one starts from $75.
All St. LouisSt. Louis & Inner Suburbs (14)West County & Chesterfield (9)St. Charles County (4)
By date
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Sun Nov 8 · 7:30 AM · Saint Charles · St. Charles County
5K10KHalf marathonMarathon
from $75Sign up ↗ -
Sat May 1 · 9:00 AM · Augusta · St. Charles County
1 mile5K10KHalf marathonTrail
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Sat May 15 · 7:00 AM · Saint Charles · St. Charles County
5K10KHalf marathonTrail
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Sat Jul 3 · 7:30 AM · St Charles · St. Charles County
5K10KHalf marathonTrail
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Quick answers
How many half marathons are in St. Charles County in the next 3 months?
1 half marathon is listed in St. Charles County between November 7 and February 5. The next is MO' Cowbell Marathon/Half-Marathon/10K/5K on Sunday, November 8 in Saint Charles.
What is the cheapest half marathon in St. Charles County right now?
MO' Cowbell Marathon/Half-Marathon/10K/5K on November 8 has the lowest listed entry fee in the next 90 days: $75. Prices are before the registration platform's processing fee.
When does the next early-bird price end for half marathons in St. Charles County?
Love to Run St. Charles - 5K | 10K | Half Marathon: the 5K goes from $30 to $35 after December 15. 2 more of these half marathons publish a later price increase.
Are there half marathons in St. Charles County this weekend?
Yes, 1: MO' Cowbell Marathon/Half-Marathon/10K/5K (Sun).