Missouri Triathlon Calendar 2025-2026

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Explore the best triathlons in Missouri for 2025-2026! Our updated list features 158 exciting races across the region. Find your next race in Missouri below and join the running community at these great events!

December 2025
Dec
6
Saturday

Wild in the Woods - 5 & 10 Mile Trail Race

Trail Run 5 mi 10 mi
Dec
6
Saturday

Wildwood Trail Marathon

Trail Run 13 mi 26 mi
Dec
13
Saturday

Westport Santa Dash

5 km
Dec
13
Saturday

Candy Cane Course- Parkville (KC)

5 km 12 km
Dec
27
Saturday

Run for the Ranch

5 km 13 mi 26 mi 6 hr
January 2026
Jan
17-18
Sa - Su

The Shippey Endurance Runs

Trail Run 20 mi 40 mi 100 km 100 mi
Jan
24
Saturday

Jack Frost 5k Run

5 km
Jan
24
Saturday

Bleak Midwinter Endurance Run

Backyard Ultra 1 hr 3 hr 6 hr 12 hr
February 2026
Feb
7
Saturday

Castlewood Cup

Trail Run 15 km
Feb
21
Saturday

Flat Branch Ultra

Trail Run 50 km
Feb
28
Saturday

Shrewsbury Thrifty Fifty

1 hr 50 km 50 mi
March 2026
Mar
6
Friday

Queeny Backyard Ultra

Backyard Ultra 4 mi
Mar
7
Saturday

Whobilation

5 km
Mar
7
Saturday

Hard Times Trail Run - Willard, MO

Trail Run 8 mi 25 km 50 km
April 2026
Apr
4
Saturday

Wolf Creek Trail Run

Trail Run 6 km 13 mi
Apr
11
Saturday

Bridge and Dam

5 km 10 km 13 mi
Apr
11
Saturday

Greater St. Louis Marathon

5 km 10 km 13 mi 26 mi
May 2026
May
2
Saturday

The Ozark's Mountain Challenge

Trail Run 17 mi
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