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!
March 2026
Test your endurance at the NorthPointe Wellness Indoor Triathlon Series in Roscoe. Complete a 350 yard swim, a 15 mile stationary bike ride, and a 2 mile treadmill run in this three part winter competition.
May 2026
Experience a unique indoor pool triathlon series in Petersburg featuring flat rural bike paths and historic run routes. Choose from mini, sprint, or challenge distances along with a 5k run for all ages.
The Lake Lou Yaeger Triathlon features a beach start in the Illinois lake, followed by flat country roads and a scenic lakeside run. Choose from Sprint or Olympic distances, including individual, relay, and aquabike options. A high school category an..
The JALC Tri-Festa Triathlon features a 0.25 mile indoor swim, 14 mile bike, and 3 mile run in Carterville. With awards for age groups and teams, it is open to participants aged 9 and up. Same day registration is available for this non USAT sanctione..
Experience a unique multi-sport event featuring biathlons and a 5K run at the Danenberger Family Vineyards. Choose between individual or team categories on a flat course with professional chip timing and finisher medals.
A community fundraising event at Goodfield Park on May 29, 2026, featuring a 5K run, 2 mile walk, disc golf tournament and virtual option. Proceeds support St. Jude Children's Hospital and shirts are guaranteed for registrations by May 20.
June 2026
Experience a fast and flat sprint course at Comlara Park in Hudson during the Tri-Shark Classic. Choose between triathlon and duathlon formats with individual and relay options available for participants aged 14 to 99.
The 9th annual Fox Lake Sprint Triathlon offers a scenic sprint course in Illinois. Swim past inflatable duck buoys, bike rolling hills, and finish on a paved path. It's also the first event in an optional three-race series with combined awards.
A USAT-certified triathlon in Paris, Illinois on June 13, 2026 offering sprint and Olympic distances plus relay options, with chip timing, race shirts, swim caps, awards and post-race refreshments.
Experience a local triathlon in Roscoe featuring a pool swim, a 17 mile country road bike course, and a 3.1 mile trail run that benefits the Stateline Boys and Girls Club.
The Tremont Triathlon features Sprint and Mini distance events, each with individual and relay options. For an extra challenge, try the Dirty Double or Dusty Double. Awards are given across many age and category groups.
July 2026
A July 4 triathlon at Lytle Park in Mattoon featuring a Sprint Triathlon with outdoor pool swim, individual and team relay options, plus a new standalone 5K. Re-mapped bike and run courses aim for straightforward navigation.
The Lake Zurich Triathlon offers a variety of distances at Paulus Park. Choose from Olympic or Sprint triathlon, duathlon, or aqua bike formats, with options for individuals or relay teams.
Join the Metro Tri Club in Columbia for a USAT sanctioned sprint triathlon featuring a pool swim and shaded run. With events for adults and youth, this multi sport challenge offers flat bike courses and scenic neighborhood trails.
Experience the original Illinois Aquathon at Three Oaks Recreation Area featuring swim and run distances for all ages. Support a local cause while competing in a unique quarry swim and scenic trail run.
Join this multi-sport challenge in Champaign featuring a 400 yard swim, 10 mile bike, and 5K run. Finishers receive medals while family and friends enjoy on-site music and food trucks.
A youth swim-run event in Geneva with two age categories. Juniors (6-10) tackle a 100m swim and 1k run, while Seniors (11-17) complete a 200m swim and 2k run. The event features a pool swim, a trail run, and finisher medals for all participants.
Experience a flat and fast course at Lake Springfield with sprint, olympic, and half distance options. Enjoy a calm lake swim followed by a shaded run and scenic bike path in the heart of Illinois.
Choose from Olympic, Sprint, or Kids distances at this multi format event in Wauconda. Part of the Lake County Sprint Tri Series, it features mapped courses with elevation data for all participants.