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 27 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!
November 2026
Indoor triathlon at Oak Brook Park District for ages 12 and up, combining 2000 meters rowing, 2.5 miles cycling and a 1.25 miles run or walk.
January 2027
An indoor, one hour swim bike run event at the ET Training Center in Lisle with timed distance scoring across swim, spin and treadmill segments.
Indoor pool and track triathlon at Norris Recreation Center on January 31, 2027, with separate adult and youth races using stationary bikes and assigned swim lanes.
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.
Monthly updates for Illinois
Get new running races (and updates) in your inbox every month.
An indoor, one hour swim bike run event at the ET Training Center in Lisle with timed distance scoring across swim, spin and treadmill segments.
Indoor Dry Tri at Neal Center YMCA with timed row, bike and run machine segments; $30 entry, waves every 25 minutes and no race day registration.
March 2027
An indoor sprint triathlon with a 10 minute swim, 15 minute bike on Keiser spin bikes, and 15 minute run on Precor treadmills, held at the CORE in Lemont IL.
An indoor, one hour swim bike run event at the ET Training Center in Lisle with timed distance scoring across swim, spin and treadmill segments.
May 2027
Lake Lou Yaeger Triathlon in Litchfield IL on May 23, 2027 features beach swim starts, sprint and Olympic distances, USAT sanctioning, and a lakeside finish festival.
June 2027
USA Triathlon sanctioned triathlon and duathlon at Comlara County Park on June 5, 2027 featuring a 600 yard swim, 13 mile bike and 5K run with online registration required.
IRONMAN 70.3 Rockford in Rockford, Illinois features a downriver swim in the Rock River, a scenic bike on rural roads and a flat run on local trails.
USAT-sanctioned Fox Lake Triathlon featuring a 1/2 mile swim, 12 mile bike and 3.1 mile run, with relay and individual entries welcome.
Tremont Triathlon on June 19 2027 in Tremont Illinois features sprint and mini triathlons plus relay and double race options with age group awards.
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.
At Three Oaks Recreation Area on July 18, 2027, the event offers 1 and 2 mile swims plus sprint and Olympic combined swim and run distances.
Multi-distance triathlon at Lake Springfield on July 24, 2027 featuring sprint, Olympic and half distances plus aquabike and relay options, USAT sanctioned.