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 33 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!
May 2026
Los Dos Indoor Duathalon is a two day indoor cycling and running challenge at Inwood Athletic Club. Athletes cycle for 20 minutes, transition, then run or walk for 30 minutes with distances recorded for awards.
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.
A multi-format triathlon at Lake Lou Yaeger in Litchfield, Illinois on May 17, 2026, featuring sprint and Olympic distances, aquabike, a high school division, and relays, with a beach swim start and flat bike roads.
A multisport triathlon on May 23, 2026 in Carterville that includes a 0.25 mile indoor swim, a 14 mile bike and a 3 mile run, with individual and team entry options and awards across multiple age divisions.
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 fundraising event at Goodfield Park supporting St. Jude Children's Hospital with a 5K, 2 Mile walk, disc golf and a virtual option. An ice cream social follows and shirts are guaranteed for registrations by May 20.
June 2026
Youth Splash and Dash in Hudson, Illinois for ages 7 to 15 as part of the USA Triathlon series, with pond swims followed by short runs and a focus on participation rather than timed results.
A sprint triathlon on the SIU campus featuring a 0.2 mile swim, five mile bike and two mile run around Campus Lake. Open to competitors aged 12 and up with male and female age divisions.
USAT sanctioned sprint triathlon in Fox Lake on June 7, 2026 featuring a 750 yard swim, 12 mile bike and 3.1 mile run. Individual and relay entries are accepted and packet pick up is available before race weekend.
A USAT-certified triathlon in Paris, Illinois on June 13, 2026 offering sprint and Olympic distances with relay options, chip timing, race apparel, awards, and post-race refreshments.
A community triathlon at NorthPointe Wellness in Roscoe with individual and team relay options, pool swim, 17 mile bike on country roads, and a run on campus trails. Entry fees support the Stateline Boys & Girls Club.
Triathlon day in Tremont Illinois on June 20, 2026 with sprint and mini distances, relays, and double-event options. Awards cover age groups and special categories and entry fees vary by event.
July 2026
A July 4 event in Mattoon, Illinois featuring a sprint triathlon with an outdoor pool swim and relay team options, plus a new standalone 5K loop. Distances range from a 5K to a 15.25 mile sprint triathlon.
A multi-format race day at Paulus Park on July 12, 2026 featuring Olympic and Sprint triathlons, duathlon and aquabike options with individual and relay categories and published entry fees.
MTC Zilla Tri in Columbia, Illinois features a Sprint, an expanded Youth Short Sprint, and a clinic with a course preview. Pool swims, on-road bike courses with one hill and a railroad crossing, and neighborhood runs make up the event.
A multi-distance aquathon at Three Oaks Recreation Area on July 19, 2026, featuring open-water swims around three islands, run legs on mixed surfaces, kids and adaptive races, and proceeds benefiting Girls on the Run Northwest Illinois.
A triathlon in Champaign Illinois on July 19, 2026 featuring a 400 yard swim, 10 mile bike and 5K run. Registration opens January 1 and closes July 16 with resident and non resident fees.
A youth triathlon at Northwestern Medicine Delnor Fitness and Health Center featuring pool swims and trail runs for ages 6 to 17, chip timing, finisher medals, and a required USAT license.
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.