Illinois Triathlon Calendar 2025-2026

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Explore the best triathlons in Illinois for 2025-2026! Our updated list features 253 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!

April 2026
Apr
26
Sunday

Ravenswood Run

5 km
May 2026
May
2
Saturday

Fight Hunger 10K

5 km 10 km
May
2
Saturday

The Lake Run

3 mi 4 mi 12 km
May
9
Saturday

Mother's Day Run/Walk - St. Charles

5 km
May
9
Saturday

F^3 Cap Sauers Trail Marathon

Trail Run 10 mi 26 mi
May
9
Saturday

Quarryman Challenge

5 km 10 mi
May
9
Saturday

Pink 5k

5 km
May
17
Sunday

Chicago Spring Half Marathon

10 km 13 mi
May
17
Sunday

I Got Your Six Walk/Run

2 mi 5 km 10 km
May
23
Saturday

Frontline OCR

Obstacle Run 5 km 10 km
May
30
Saturday

Elsa Chicken Plucker Backyard Ultra

Backyard Ultra 4 mi
May
31
Sunday

North Shore Classic

5 km 13 mi
June 2026
Jun
27
Saturday

Miles for Maddog

5 km 10 km
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