Illinois Running Calendar 2025-2026

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Explore the best running races in Illinois for 2025-2026! Our updated list features 307 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!

Half Marathons Marathons Trail Runs Triathlons
May 2026
May
3
Sunday

Unit 5K

5 km
May
3
Sunday

Tailwagger Trot

5 km
May
3
Sunday

Lakefront Loop 5K

5 km
May
9
Saturday

Mother's Day Run/Walk - St. Charles

5 km
May
9
Saturday

F^3 Cap Sauers Trail Marathon

Trail Run
May
9
Saturday

Quarryman Challenge

5 km 10 mi
May
9
Saturday

Pink 5k

5 km
May
10
Sunday

Barrington Mother's Day 5K

5 km
May
16
Saturday

Galena Sky Trail Races

Backyard Ultra 4 hr 8 hr
May
16
Saturday

YMCA Springfest Fun Run 5k

3 mi
May
16
Saturday

Chicago 11 Hour Endurance Run

Backyard Ultra 11 hr
May
16
Saturday

Ducky Dash

5 km
May
16
Saturday

Run for D103 5K

5 km
May
17
Sunday

Chicago Spring Half Marathon

5 km Half Marathon
May
17
Sunday

I Got Your Six Walk/Run

2 mi 5 km 10 km
May
17
Sunday

Lake Lou Yaeger Triathlon

Triathlon
May
23
Saturday

Frontline OCR

Obstacle Run 5 km 10 km
May
23
Saturday

Goose Creek Classic

5 km 10 km
May
24
Sunday

Race to the Flag

5 km
May
25
Monday

Nina LeCuyer Memorial

5 km
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