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Triathlon Calendar near Wentzville 2025-2026

Explore the top triathlons near Wentzville for 2025-2026! We've gathered 35 exciting races in the area. Check out our detailed list below to find your next local race.

June 2025
Jun
29
Sunday

Blue Line Run

5 km
July 2025
Jul
4
Friday

O'Fallon Firecracker Run

5 km 10 km
Jul
5
Saturday

Rockin' Riverfest Half Marathon

5 km 10 km 13 mi
Jul
6
Sunday

All American 8 Mile - St. Louis

4 mi 8 mi
Jul
19
Saturday

Get Your Butt Kicked @ Route 66

Trail Run 2 mi
Jul
20
Sunday

Ballwin Triathlon

Triathlon
August 2025
Aug
2
Saturday

Washington Town & Country Fair Run

5 km 10 km
Aug
3
Sunday

St. Charles Runners Club Flat Five

5 mi
Aug
9
Saturday

Drink MO Beer 10k

5 km 10 km
Aug
17
Sunday

Ballwin Days 5K

5 km
Aug
17
Sunday

370 Lakeside Triathlon

Triathlon
Aug
30
Saturday

Corps of Discovery Trail Races

Trail Run 5 mi 8 mi 13 mi
September 2025
Sep
7
Sunday

Lap the Lake Race Series

5 km 10 mi 13 mi
Sep
13
Saturday

Rockin' Rockwoods 53K and 1/2 Marathon

Trail Run 13 mi 53 km
Sep
27
Saturday

The Piggyback Dash 10K

5 km 10 km
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
11
Saturday

Harvest Moon Run

5 km
Oct
18
Saturday

Trinity Christian Academy 5k

5 km
Oct
24
Friday

Moonlight Howl 5K

5 km
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