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Illinois Triathlon Calendar 2025-2026

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Explore the best triathlons in Illinois for 2025-2026! Our updated list features 8 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!

November 2025
Nov
23
Sunday

Turkey Dri Tri Oak Brook Park District

Triathlon
February 2026
Feb
28
Saturday

YMCA Dry Tri

Triathlon
March 2026
Mar
14
Saturday

CORE Indoor Sprint Triathlon

Triathlon
May 2026
May
17
Sunday

Lake Lou Yaeger Triathlon

Triathlon
June 2026
Jun
6
Saturday

Tri-Shark Classic

Triathlon
Jun
14
Sunday

Ironman 70.3 Rockford Illinois

Triathlon
Jun
27
Saturday

Tremont Triathlon

Triathlon
July 2026
Jul
25
Saturday

Lake Springfield Triathlon

Triathlon
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