Illinois Obstacle Race Calendar 2025-2026

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Explore the best obstacle runs in Illinois for 2025-2026! Our updated list features 258 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!

September 2025
Sep
13
Saturday

Monster 5K Run/Walk

3 km 5 km
Sep
13
Saturday

Friends of the Poor Walk and Run

Sep
14
Sunday

Timely Nonsense - Chicago, IL

Backyard Ultra 6 hr 12 hr
Sep
14
Sunday

Big Horse 5K

Trail Run 5 km
Sep
14
Sunday

El Grito Family Run/Walk

5 km
Sep
20
Saturday

Harvest Hammer Duathlon

Duathlon
Sep
21
Sunday

Carlyle Lake Triathlon

Triathlon
Sep
21
Sunday

St. Veronica 6k Run/Walk for Scholarships

6 km
Sep
21
Sunday

Fox Valley Marathon Races

5 km 13 mi 20 mi 26 mi
Sep
26
Friday

Run for Hope - Vienna, IL

5 km 10 km
Sep
27
Saturday

Midwest OCR

Obstacle Run 5 km 10 km
Sep
27-28
Sa - Su

Quad Cities Marathon

5 km 10 km 21 km 42 km
Sep
27
Saturday

Lawndale 5K

5 km
Sep
27
Saturday

Belleville Main Street Marathon

13 mi 26 mi
Sep
27
Saturday

Stone Bridge Half Marathon

5 km 13 mi
Sep
28
Sunday

DeKalb Corn Classic

5 km 10 km
Sep
28
Sunday

Lester Fun Run

5 km
Sep
28
Sunday

Chicago Half Marathon

5 km 13 mi
October 2025
Oct
4-5
Sa - Su

The Hennepin Hundred

Trail Run 50 km 50 mi 100 mi
Oct
4
Saturday

Castle Creek Triathlon

Triathlon
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