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Running Calendar near O'Fallon 2026-2027

Monthly updates for O'Fallon

Get new running races (and updates) in your inbox every month.

Explore the top running races near O'Fallon for 2026-2027! We've gathered 80 exciting races in the area. Check out our detailed list below to find your next local race.

Half Marathons Marathons Trail Runs Triathlons
January 2026
Jan
10
Sa

St. Louis Track Club Frostbite Series

3 km 3 mi ... 20 km 13 mi
Jan
10
Sa

Stick Season Trail Run Series

Triathlon
Jan
17-18
Sa - Su

The Shippey Endurance Runs

Trail Run 20 mi 41 mi 61 mi 102 mi
Jan
17
Sa

Stick Season Trail Run Series

Triathlon
Jan
24
Sa

Time Travel Half-Marathon - St. Louis

3 mi 6 mi 13 mi
Jan
24
Sa

The Frozen Stick Half Marathon Trail Run

Trail Run 5 mi 13 mi
Jan
24
Sa

St. Louis Track Club Frostbite Series

3 km 3 mi ... 20 km 13 mi
Jan
24
Sa

Stick Season Trail Run Series

Triathlon
Jan
31
Sa

Castlewood Cup

Trail Run 15 km
February 2026
Feb
7
Sa

963 Beulah Challenge

Trail Run 13 mi 25 mi 50 km
Feb
7
Sa

St. Louis Track Club Frostbite Series

3 km 3 mi ... 20 km 13 mi
Feb
7
Sa

Run for Your Beads 5K

5 km
Feb
14
Sa

Running From Yeti - St. Louis, MO

5 km 10 km Half Marathon
Feb
14
Sa

Run for the Chocolate

5 km
Feb
22
Su

Couch Tater Run

5 km 10 km
Feb
22
Su

Bootlegger Trail Run

Trail Run 10 km
Feb
28
Sa

Shrewsbury Thrifty Fifty

1 hr 50 km 50 mi
Feb
28
Sa

Run for Share

5 km 10 km
March 2026
Mar
1
Su

Brian J. Smith CHAMP 5K

5 km
Mar
1
Su

Tri WashU

Triathlon