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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 15 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!

January 2026
Jan
31
Sa

Northpointe Wellness Indoor Triathlon Series

Triathlon
February 2026
Feb
1
Su

St. Charles Indoor Triathlon

Triathlon
Feb
22
Su

Wildcat Indoor Triathlon

Triathlon
Feb
28
Sa

YMCA Dry Tri

Triathlon
Feb
28
Sa

Northpointe Wellness Indoor Triathlon Series

Triathlon
March 2026
Mar
14
Sa

CORE Indoor Sprint Triathlon

Triathlon
Mar
21
Sa

Northpointe Wellness Indoor Triathlon Series

Triathlon
May 2026
May
9-16
Sa

Pioneer Spirit Triathlon - Challenge

Triathlon
May
17
Su

Lake Lou Yaeger Triathlon

Triathlon
June 2026
Jun
6
Sa

Tri-Shark Classic

Triathlon
Jun
13
Sa

Eiffel Tower Triathlon

Triathlon
Jun
14
Su

Ironman 70.3 Rockford Illinois

Triathlon
Jun
20
Sa

Tremont Triathlon

Triathlon
July 2026
Jul
25
Sa

Lake Springfield Triathlon

Triathlon
September 2026
Sep
20
Su

Carlyle Lake Triathlon

Triathlon