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!
August 2027
Sprint triathlon, duathlon, aquabike and kids triathlon on August 1, 2027 at Centennial Beach Park in Naperville with a pool swim, two loop 22K bike and 5K run.
MTC Zilla Tri in Columbia IL offers sprint and youth short sprint courses with pool swims, road cycling and neighborhood runs under USAT rules.
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 on Lake Michigan in Chicago with swims from Monroe Harbor or Foster Beach, city-center bike routes, and runs past major lakeside landmarks.
Monthly updates for Illinois
Get new running races (and updates) in your inbox every month.
September 2027
A community running event in Morrison Illinois featuring a 5K, a duathlon with a 21 mile bike leg, a color run, and multiple children's races.
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.