Illinois
Illinois Triathlon Calendar 2026-2027
Monthly updates for Illinois
Get new running races (and updates) in your inbox every month.
Explore the best triathlons in Illinois for 2026-2027! Our updated list features 26 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!
January 2026
Join the NorthPointe Wellness Indoor Triathlon Series in Roscoe Jan to Mar 2026 for three indoor swim bike run races. Register for a single race or the full series and chase top overall awards while spots remain.
February 2026
Join the St. Charles Indoor Triathlon on Feb 1, 2026 at Norris Recreation Center, featuring adult and youth waves with pool lane swims, stationary bikes, and a tracked run. Proceeds benefit St. Charles Aquatics and youth tri programs.
Indoor triathlon in Evanston on February 22, 2026, with timed swim, bike and run segments and separate Collegiate and Open categories. The event serves as a qualifier for the U.S. Collegiate Club Triathlon Nationals.
Indoor triathlon at Lifetime Fitness in Burr Ridge on Feb 22, 2026, featuring timed swim, studio cycling and treadmill runs for a fast, competitive workout. Small waves, finisher shirt and medal, plus awards for top performers.
Push your limits at the YMCA Dry Tri on Feb 28, 2026 at Neal Center in Toledo, IL with indoor rowing, cycling and treadmill segments. Timed heats use venue equipment and need advance registration; sign up by Feb 9 to guarantee a shirt.
Join the NorthPointe Wellness Indoor Triathlon Series in Roscoe Jan to Mar 2026 for three indoor swim bike run races. Register for a single race or the full series and chase top overall awards while spots remain.
March 2026
Grab a partner for the Dream Team Dri Tri at Oak Brook Park District on March 8, 2026, a two person relay mixing indoor rowing, air assault biking and laps on the track. Open to ages 12 and up, registration closes March 5.
Join an indoor triathlon in New Lenox on March 8, 2026 to support the Crisis Center for South Suburbia. Swim, bike, and run on timed machines for fun and fitness while raising funds for a great cause.
Test your speed at the CORE Indoor Sprint Triathlon in Lemont with timed swim, spin bike and treadmill segments in small 20 minute heats. Awards, participant shirt and limited spots make early registration smart.
Join the NorthPointe Wellness Indoor Triathlon Series in Roscoe Jan to Mar 2026 for three indoor swim bike run races. Register for a single race or the full series and chase top overall awards while spots remain.
May 2026
Pioneer Spirit Triathlon in Petersburg IL features Mini, Sprint and a back to back Tri Challenge with swims in a heated indoor pool and scenic bike and run routes through historic streets. In person and virtual 5k options welcome beginners.
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
Join the Tri Shark Classic on June 6, 2026 in Hudson, Illinois for sprint triathlon and duathlon races and relays on a flat, fast course through scenic Comlara Park. Fast, friendly and perfect for racers of all levels.
A USAT sanctioned sprint triathlon in Fox Lake on June 7, 2026 with a 750 yard swim, 12 mile bike and 3.1 mile run. Individual and relay entries are accepted and the finish area includes food, music, and awards.
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.
Join the Tremont Triathlon in Tremont, IL on June 20, 2026 with sprint and mini courses for individuals, relays, or double challenges. Swim, bike and run on friendly courses with age group awards for all levels.
July 2026
Lake Zurich Triathlon on July 12, 2026 at Paulus Park offers Olympic, sprint, duathlon and aquabike formats with measured swim, bike and run distances and a range of entry options.
Take the plunge at Crystal Lake Aquathon in Three Oaks Recreation Area, where swimmers circle three islands and runners enjoy scenic trail, sand and pavement loops. Choose sprint, Olympic or timed swim distances while supporting Girls on the Run of N..
Lake Springfield Triathlon in Springfield, Illinois on Saturday, July 25, 2026 features a calm lake swim, a flat fast bike course and a shady scenic run. Multiple distances and relay options make it ideal for first timers and veteran racers alike.
August 2026
A one-day multisport event in Naperville on August 2, 2026 featuring sprint triathlon, kid's triathlon, duathlon and aquabike formats at 500 Jackson Ave with several entry categories and published fees.