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 22 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!
August 2026
Annual multisport event at Centennial Beach in Naperville offering sprint triathlon, duathlon, aquabike and kids triathlon distances.
A USAT sanctioned sprint and youth short sprint triathlon weekend in Bolm-Schuhkraft Park featuring pool swims, mostly flat bike routes with one hill, and neighborhood runs.
A sprint triathlon in Olney Illinois featuring a 200 meter swim, a 14.2 mile bike ride, and a 3.1 mile run. Categories include age group, team, and Zeus/Xena divisions with awards for top finishers.
Sage City Triathlon in Monticello offers sprint and mini triathlon distances, a shallow pool, age-group and overall awards, and post-race food. Registration opens March 1 and the event is not USAT sanctioned.
A short-course triathlon on August 15, 2026 in O'Fallon, IL featuring a 150 m pool swim, 10 mile bike through rolling hills, and a 2 mile flat run. Post-race breakfast is available and proceeds support a memorial foundation.
A two day Lake Michigan triathlon with swim, bike and run courses through central Chicago and race options from kids to Olympic distance.
September 2026
An adventure triathlon in Moline with a 2.5 mile paddle, a 7.5 mile mountain bike course including 5 miles off road, and a run across the I-74 Bridge.
A community biathlon and 5K in Millstadt with a 5 mile run plus 22 mile bike ride, separate 5K, age group awards, teams, post race food and charity proceeds.
A community race day in Morrison, Illinois with a 5K out-and-back, a duathlon including a 21-mile bike, children's fun runs, and a color run; courses start at Morrison High School and include rolling hills and on-course water stops.
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.
A sprint triathlon at the University of Illinois combining a 300 meter pool swim, a 14 mile bike and a 5 kilometer run. Packet pickup is offered the day before and race morning and the event follows USA Triathlon rules.
October 2026
A draft legal sprint triathlon for NCAA collegiate women at Clinton Lake SRA featuring a 750 m swim, 12 mile bike and 3.2 mile run, organized in two waves with segment time limits.
A pool swim, 12 mile bike and 3.1 mile run at the Mattoon Area Family YMCA on October 4, 2026. Individuals or teams of two or three may enter and helmets are required for the bike segment.
A community 5K and family Teal Pumpkin Festival in Peoria Heights supporting food allergy awareness with in-person and virtual race options.
November 2026
Indoor triathlon at Oak Brook Park District on November 22, 2026 featuring rowing, stationary cycling, and a track run. Open to ages 12 and up with heats assigned by age and gender; registration runs September 1 to October 1 for $20.
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.
Indoor dry triathlon at the Neal Center YMCA featuring a 10 minute row, 20 minute bike and 15 minute treadmill walk or run with staggered wave starts.
May 2027
Lake Lou Yaeger Triathlon in Litchfield Illinois offers sprint and Olympic options with a beach swim, scenic bike and lake run. The USAT sanctioned event includes packet pickup, on course support, awards and a finish line festival.
June 2027
A half distance triathlon in Rockford Illinois with a downriver swim in the Rock River, a rolling bike through rural roads and a flat run on local trails.
July 2027
Multi-distance triathlon at Lake Springfield on July 25, 2026, with dock swim starts, revised bike routes, relay options, and a finish-line festival with awards and food.