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 17 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!
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.
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 Trail System in Rockford with chip timing, meals, and proceeds supporting local trail building.
Mini triathlon and 5K in Annawan IL on October 10, 2026 featuring run bike and paddle legs plus a two person relay option.
5K and family friendly Teal Pumpkin festival in Peoria Heights promoting food allergy awareness with in-person and virtual participation options.
Monthly updates for Illinois
Get new running races (and updates) in your inbox every month.
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.
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.
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
IRONMAN 70.3 Rockford in Rockford, Illinois features a downriver swim on the Rock River, rolling scenic bike roads through rural Illinois, and a flat run along local trails.
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.
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.