Missouri Triathlon Calendar 2025-2026

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Explore the best triathlons in Missouri for 2025-2026! Our updated list features 145 exciting races across the region. Find your next race in Missouri below and join the running community at these great events!

August 2025
Aug
2
Saturday

Washington Town & Country Fair Run

5 km 10 km
Aug
3
Sunday

Summer Sizzler- St. Joseph

5 km 10 km 15 km
Aug
8-10
Fr - Su

Kansas City Backyard Ultra

Trail Run 4 mi 3 hr ... 9 hr 12 hr
Aug
9
Saturday

Run to Bless

5 km
Aug
9
Saturday

Drink MO Beer 10k

5 km 10 km
Aug
9
Saturday

Swifty Fun Run - St. Louis

5 km 10 km 13 mi
Aug
16
Saturday

3 Legged Monster Race

Trail Run 7 mi 12 mi ... 33 mi 55 mi
Aug
16-17
Sa - Su

Bad Dawg Ultra

Trail Run 12 mi 50 km ... 100 km 100 mi
Aug
17
Sunday

Ballwin Days 5K

5 km
Aug
17
Sunday

370 Lakeside Triathlon

Triathlon
Aug
17
Sunday

Hearts for RMHC 5k/10k

5 km 10 km
Aug
23
Saturday

Jog for Jax

5 km
Aug
23
Saturday

Royal Oaks Sunrise Trail Race

Trail Run 3 mi 10 km
Aug
24
Sunday

Summer Sizzler - St. Louis

5 km 10 km 15 km
Aug
30
Saturday

Leaky Hourglass Ultra

Backyard Ultra 4 mi
Aug
30
Saturday

Corps of Discovery Trail Races

Trail Run 5 mi 8 mi 13 mi
Aug
30
Saturday

The Best Races - Kansas City

5 km 10 km 13 mi
September 2025
Sep
1
Monday

Kansas City Temple Run

3 km 5 km
Sep
1
Monday

Heart of America Marathon

26 mi
Sep
6
Saturday

Northside Trap Run

5 km
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