Illinois Triathlon Calendar 2025-2026

Header image

Explore the best triathlons in Illinois for 2025-2026! Our updated list features 267 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!

April 2026
Apr
11
Saturday

Lincoln Presidential Half Marathon

13 mi
Apr
18
Saturday

Chicken Run

5 km 10 km
Apr
18
Saturday

Earth Day 50k

Trail Run 5 mi 15 mi 50 km
Apr
25
Saturday

Childish Nonsense

Trail Run 10 km 25 km 50 km 50 mi
May 2026
May
9
Saturday

Mother's Day Run/Walk - St. Charles

5 km
May
17
Sunday

Chicago Spring Half Marathon

10 km 13 mi
May
30
Saturday

Elsa Chicken Plucker Backyard Ultra

Backyard Ultra 4 mi
Articles
Top 10 Marathons in the Netherlands — The Ultimate Dutch Marathon Bucket List: 10 Unmissable Races
The Beauty of the Easy Run — Why slowing down might be the smartest thing you do for your running
Mizuno Wave Rider 28: Elevating the Legacy of a Running Icon
Garmin Forerunner Review: Garmin Forerunner Series