Illinois
Illinois Triathlon Calendar 2026-2027
Monthly updates for Illinois
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Explore the best triathlons in Illinois for 2026-2027! Our updated list features 29 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!
August 2026
The annual Naperville Sprint Triathlon offers several race formats from Centennial Beach Park. Participants can tackle a swim, bike, and run course individually or as a relay.
This kids' triathlon in Olney offers a fun, untimed experience for ages 3-15. It features three divisions with different age groups and is free for Richland County youth. Join on August 7 at the Musgrove Aquatic Center.
Sage City Triathlon in Monticello features sprint and mini distances with individual and relay options, awards across multiple age categories, on-site athlete marking and post-race food.
Race through the heart of the Windy City with a Lake Michigan swim and a closed-course bike ride along iconic streets. Choose from Olympic, Sprint, and Junior distances in one of the world's most accessible triathlons.
September 2026
Challenge yourself at the Harvest Hammer Duathlon in Morrison: a 5k run followed by a 21 mile bike, with run only and team entries allowed. Family friendly youth races, prizes, chip timing and Rotary supported proceeds make it a highlight.
Experience a beach start at Illinois largest man made lake followed by a flat bike course and a finish over the dam spillway. This event offers individual and relay options across triathlon duathlon and aquabike distances.
October 2026
Test yourself at the Mattoon Last Chance Tri at the Mattoon Area Family YMCA with a 275 yard indoor swim, 12 mile bike and 3.1 mile run. Register by September 12, 2025 for a tech shirt and race solo or on a team.
November 2026
An indoor triathlon featuring a row, cycle, and run on fixed equipment and a track. Athletes compete in timed heats, with top finishers earning the Golden Turkey prize.
February 2027
Experience an indoor triathlon in Evanston where distance is the goal. Complete a ten minute swim, twenty minute bike, and fifteen minute run to qualify for the U.S. Collegiate Club Triathlon Nationals.