Upcoming Triathlons in Illinois

Endurance Grid lists 16 triathlons in Illinois, from November 2026 to October 2027 across 14 cities.

16
Races
14
Cities

Triathlon Races in Illinois

The triathlon race calendar in Illinois is busiest in June, August, and February, with races most often in Lemont and Rockford.

What a triathlon is

A triathlon is three sports in one race — swim, then bike, then run, back to back, with two timed transitions in between. The sprint distance — a 750m swim, 20K bike, and 5K run — makes the sport more accessible than most people think.

The swim start is exciting and chaotic but finds a rhythm fast; the bike course is usually quiet; the run brings the crowds and the finish line. Beyond fitness, the transitions between disciplines are their own skill.

Frequently Asked Questions

How many triathlons are in Illinois?
Endurance Grid's Race Calendar lists 16 upcoming triathlons in Illinois across 14 cities, from November 2026 to October 2027.
What triathlon distances are offered in Illinois?
Triathlons in Illinois include Olympic and Sprint distances.
When is triathlon season in Illinois?
Triathlon season in Illinois runs spring through fall — the warmer months when open water is race-ready. Of the upcoming triathlons on Endurance Grid's Race Calendar, the most are in June and August.
Which Illinois cities have triathlons?
Triathlons in Illinois are held in Oak Brook, Olney, Columbia, Evanston, Hudson, Lemont, Litchfield, Mattoon, Monticello, and Rockford, plus 4 other cities.

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