Illinois
Illinois Triathlon Calendar 2025-2026
Monthly updates for Illinois
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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
Come to the NorthPointe Wellness Indoor Triathlon Series in Roscoe from Jan 31 to Mar 21, 2026 for three indoor swim, stationary bike and treadmill run events. Enter single races or the whole series for medals and fun.
February 2026
Dive into winter at the St. Charles Indoor Triathlon, Feb 1, 2026 at Norris Rec Center, with adult and youth divisions offering a lively indoor multisport challenge. Proceeds benefit St. Charles Aquatics and Multisport Madness youth team.
Keep winter training alive at the Wildcat Indoor Triathlon in Evanston on February 22, 2026. Swim, bike and run in timed segments to build total distance, with collegiate and open divisions and chances to qualify for U.S. Collegiate Club Triathlon Na..
Join the YMCA Dry Tri at Toledo's Neal Center YMCA on February 28, 2026. Row, bike and run on premium indoor equipment in timed waves for a fast, friendly winter challenge with no pool required.
Come to the NorthPointe Wellness Indoor Triathlon Series in Roscoe from Jan 31 to Mar 21, 2026 for three indoor swim, stationary bike and treadmill run events. Enter single races or the whole series for medals and fun.
March 2026
Take on a fast paced indoor sprint triathlon in Lemont with a 10 minute swim, 15 minute bike and 15 minute run, all timed and stacked into 20 minute heats. Perfect for newcomers and seasoned athletes seeking a compact high energy challenge.
Come to the NorthPointe Wellness Indoor Triathlon Series in Roscoe from Jan 31 to Mar 21, 2026 for three indoor swim, stationary bike and treadmill run events. Enter single races or the whole series for medals and fun.
May 2026
Race the Pioneer Spirit Triathlon in Petersburg, IL, May 9 to 16, 2026, with heated indoor pool swims, bike and run legs plus a 5k offered on site or virtually. Fun and welcoming for first timers and seasoned racers alike.
Lake Lou Yaeger Triathlon in Litchfield IL on May 17, 2026 offers sprint and Olympic distances plus aquabike, relay and a high school sprint, with an open water swim clinic May 16. Enjoy a beach start, flat country roads and a lakeside run for a scen..
June 2026
Take on a sprint triathlon or duathlon at the Tri Shark Classic in Comlara Park, Hudson, on June 6, 2026. Flat, fast courses and relay options make this a perfect summer test for newcomers and seasoned racers alike.
Race the 6th annual Eiffel Tower Triathlon in Paris, Illinois on June 13, 2026 with sprint and Olympic options plus relay teams, all USAT certified. Scenic lake swim, chip timing, finisher gear and a festive after race atmosphere await.
Tackle IRONMAN 70.3 Rockford, a qualifier for the 2026 World Championship, with a Rock River swim, rolling country bike and flat trail run. Expect lively crowds, course side parties and hometown energy that sells out fast.
Challenge yourself at the Tremont Triathlon on June 20, 2026 in Tremont IL with sprint and mini distances, relay teams, and double race options for extra fun. Family friendly course and age group awards make it great for all levels.
July 2026
Dive into the Lake Springfield Triathlon on July 25, 2026, with sprint, Olympic and half distances plus relay and a high school sprint. Enjoy a calm lake swim, flat fast bike and shady run perfect for racers of all levels.
September 2026
Beach start swim at Carlyle Lake leads to a scenic mostly flat bike and a rolling country run that finishes over the spillway. Sprint and Olympic triathlon and duathlon options plus relays and aquabike, with food and music after the race.