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Illinois Triathlon Calendar 2026-2027

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Monthly updates for Illinois

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Explore the best triathlons in Illinois for 2026-2027! Our updated list features 31 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!

August 2026
Aug
7
Fr

White Squirrel Triathlon

Triathlon
Aug
8
Sa

Sage City Triathlon

Triathlon
Aug
22-23
Sa - Su

Supertri Chicago

Triathlon
September 2026
Sep
12
Sa

Taming of the Slough Adventure Triathlon

Multisport
Sep
19
Sa

Harvest Hammer Run and Duathlon

Duathlon
Sep
20
Su

Carlyle Lake Triathlon

Triathlon
Sep
27
Su

Tri The Illini

Triathlon
October 2026
Oct
3
Sa

Prairie State Cup

Triathlon
Oct
4
Su

Mattoon Last Chance Triathlon

Triathlon
November 2026
Nov
22
Su

Turkey Dri Tri Oak Brook Park District

Triathlon
February 2027
Feb
21
Su

Wildcat Indoor Triathlon

Triathlon
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