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 18 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!
September 2026
Community biathlon and 5K in Millstadt featuring a 5 mile run and 22 mile bike, age and team awards, post-race food and yoga, proceeds to the park fund.
A community race day in Morrison featuring a duathlon, 5K, multiple kids races and a Color Run, with chip timing and age‑group awards.
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 collegiate sprint triathlon for NCAA women at Clinton Lake SRA with a 750 meter swim, 12 mile bike and 3.2 mile run.
Monthly updates for Illinois
Get new running races (and updates) in your inbox every month.
A pool-to-road triathlon at the Mattoon Area Family YMCA with a 275 yard swim, 12 mile bike and 3.1 mile run; individual and team entries and age-group awards.
Off road duathlons and mountain bike races at Atwood Park with professional chip timing, on site meal, and proceeds supporting local trail building.
Community walk/run and Teal Pumpkin festival in Peoria Heights promoting food allergy awareness with in-person and virtual options.
November 2026
Indoor triathlon at Oak Brook Family Recreation Center featuring rowing, cycling, and a 1.25 mile run for ages 12 and up on November 22nd.
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
Experience a scenic beach start and flat country roads at the Lake Lou Yaeger Triathlon featuring Sprint and Olympic distances in Litchfield Illinois.
June 2027
A half distance triathlon in Rockford, Illinois featuring a downriver swim in the Rock River, a scenic rolling bike through rural roads and a flat trail run.
July 2027
Annual multi sport event in Lake Zurich, IL offering Olympic and Sprint triathlon distances plus a duathlon at Paulus Park; sanctioned by USA Triathlon.
A multi event day in Rockford, Illinois on July 18, 2027 featuring an 18 mile duathlon, a 2 mile run, and a 2 mile ruck with specified loads. A short free post race fitness challenge is included for participants.
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.
August 2027
Annual August triathlon in downtown Naperville at Centennial Beach offering sprint, duathlon, aquabike and kids distances; USAT sanctioned.
Multi distance triathlon at Foster Beach in Chicago on August 21-22, 2027, featuring SuperSprint, Sprint and Olympic races plus relay, corporate and junior categories.