Illinois Triathlon Calendar 2025-2026

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Explore the best triathlons in Illinois for 2025-2026! Our updated list features 20 exciting races across the state. Find your next race in Illinois below and join the running community at these great events!

February 2025
Feb
2
Sunday

St. Charles Indoor Triathlon

Triathlon
Feb
22
Saturday

Iceman Triathlon

Triathlon
Feb
22
Saturday

YMCA Dry Tri

Triathlon
Feb
23
Sunday

Lifetime Fitness Indoor Triathlon

Triathlon
March 2025
Mar
29
Saturday

CORE Indoor Sprint Triathlon

Triathlon
May 2025
May
10
Saturday

Pioneer Spirit Triathlon - Challenge

Triathlon
May
17
Saturday

QCKG Tri-It Triathlon

Triathlon
May
18
Sunday

Lake Lou Yaeger Triathlon

Triathlon
May
24
Saturday

LIFT Duathlon

Duathlon
June 2025
Jun
7
Saturday

Tri-Shark Classic

Triathlon
Jun
22
Sunday

Clinton Lake Triathlon

Triathlon
Jun
22
Sunday

Ironman 70.3 Rockford Illinois

Triathlon
Jun
28
Saturday

Tremont Triathlon

Triathlon
July 2025
Jul
12
Saturday

Mattoon-Man

Triathlon
Jul
20
Sunday

Crystal Lake Aquathon

Aquathlon
Jul
26
Saturday

Lake Springfield Triathlon

Triathlon
August 2025
Aug
2
Saturday

Booster Bash Triathlon

Triathlon
September 2025
Sep
21
Sunday

Carlyle Lake Triathlon

Triathlon
October 2025
Oct
4
Saturday

Mattoon Last Chance Triathlon

Triathlon
Oct
4
Saturday

Castle Creek Triathlon

Triathlon
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