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Triathlon Calendar near Saint Charles 2025-2026

Explore the top triathlons near Saint Charles for 2025-2026! We've gathered 59 exciting races in the area. Check out our detailed list below to find your next local race.

October 2025
Oct
5
Sunday

Mo' Cowbell Marathon

5 km 10 km 13 mi 26 mi
Oct
11
Saturday

Declue Loops Trail Race

Backyard Ultra 8 mi 16 mi 26 mi 50 km
Oct
18-19
Sa - Su

The Great St. Louis Halloween Race

5 km 10 km 13 mi
Oct
18
Saturday

Trinity Christian Academy 5k

5 km
Oct
18
Saturday

Minnie Ha Ha 12 Hour Run

Backyard Ultra 6 hr 12 hr
Oct
24
Friday

Moonlight Howl 5K

5 km
Oct
25
Saturday

Babler Bongo 15K Trail Race

Trail Run 15 km
Oct
25
Saturday

Hot Cider Hustle - St. Louis

5 km 10 km
November 2025
Nov
9
Sunday

Saint Louis Half Marathon

5 km 13 mi
Nov
27
Thursday

WILDWOOD Turkey Trot 10K

5 km 10 km
Nov
27
Thursday

St. Louis Turkey Trot 8K

5 km 8 km
December 2025
Dec
6
Saturday

Wild in the Woods - 5 & 10 Mile Trail Race

Trail Run 5 mi 10 mi
January 2026
Jan
17-18
Sa - Su

The Shippey Endurance Runs

Trail Run 20 mi 40 mi 100 km 100 mi
February 2026
Feb
7
Saturday

Castlewood Cup

Trail Run 15 km
Feb
28
Saturday

Shrewsbury Thrifty Fifty

1 hr 50 km 50 mi
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