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 16 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 Family Recreation Center featuring rowing, cycling, and a 1.25 mile run or walk for ages 12 and up.
January 2027
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.
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.
Monthly updates for Illinois
Get new running races (and updates) in your inbox every month.
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
A triathlon in Rockford, Illinois with a downriver swim on the Rock River, rolling bike roads and a flat run on city trails; one of the last qualifiers for the 2027 IRONMAN 70.3 World Championship.
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 24, 2027 featuring sprint, Olympic and half distances plus aquabike and relay options, USAT sanctioned.
August 2027
Annual August triathlon in downtown Naperville at Centennial Beach offering sprint, duathlon, aquabike and kids distances; USAT sanctioned.
A sprint triathlon in Olney, Illinois on August 7, 2027 with a 200 meter swim, 14.2 mile bike and 3.1 mile run plus individual, team and weight categories.
Triathlon in Monticello IL on August 7, 2027 with mini and sprint distances, a shallow pool swim, awards by age group and post race food; registration opens March 1.
A multi-distance triathlon along Lake Michigan in Chicago on August 21-22, 2027 with sprint, Olympic, SuperSprint and kids races plus city bike and run routes.
September 2027
A community event with a 5K, a duathlon including a 21 mile bike, children's fun runs and a color run, hosted at Morrison High School.
October 2027
A pool triathlon at the Mattoon YMCA with a 275 yard swim, 12 mile bike and 3.1 mile run, offering individual and team entries and age group awards.