Illinois Triathlon Calendar 2025-2026

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Explore the best triathlons in Illinois for 2025-2026! Our updated list features 345 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!

December 2025
Dec
6
Saturday

Arctic Frog Run - Libertyville, IL

Trail Run 5 km 10 km ... 25 km 50 km
Dec
6
Saturday

Santa Hustle Chicago

5 km 10 km
January 2026
Jan
1
Thursday

Resolution Run - Olympia Fields

6 km
Jan
31
Saturday

F3 Lake Half Marathon

5 km 13 mi
March 2026
Mar
21
Saturday

Skunk Ape 806/314 Trail Race

Trail Run 13 mi 33 mi
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