Oak Brook
Triathlon Calendar near Oak Brook 2026-2027
Monthly updates for Oak Brook
Get new running races (and updates) in your inbox every month.
Explore the top triathlons near Oak Brook for 2026-2027! We've gathered 10 exciting races in the area. Check out our detailed list below to find your next local race.
February 2026
Join the St. Charles Indoor Triathlon on Feb 1, 2026 at Norris Recreation Center, featuring adult and youth waves with pool lane swims, stationary bikes, and a tracked run. Proceeds benefit St. Charles Aquatics and youth tri programs.
Indoor triathlon in Evanston on February 22, 2026, with timed swim, bike and run segments and separate Collegiate and Open categories. The event serves as a qualifier for the U.S. Collegiate Club Triathlon Nationals.
Indoor triathlon at Lifetime Fitness in Burr Ridge on Feb 22, 2026, featuring timed swim, studio cycling and treadmill runs for a fast, competitive workout. Small waves, finisher shirt and medal, plus awards for top performers.
March 2026
Grab a partner for the Dream Team Dri Tri at Oak Brook Park District on March 8, 2026, a two person relay mixing indoor rowing, air assault biking and laps on the track. Open to ages 12 and up, registration closes March 5.
Join an indoor triathlon in New Lenox on March 8, 2026 to support the Crisis Center for South Suburbia. Swim, bike, and run on timed machines for fun and fitness while raising funds for a great cause.
Test your speed at the CORE Indoor Sprint Triathlon in Lemont with timed swim, spin bike and treadmill segments in small 20 minute heats. Awards, participant shirt and limited spots make early registration smart.
June 2026
Join America's Race Leon's Triathlon in Hammond, Indiana June 6 to 7 for sprint and Olympic races plus a kids Splash and Dash. Part of the Chicagoland Tri Series, the weekend honors and supports military, veterans and first responders.
July 2026
Lake Zurich Triathlon on July 12, 2026 at Paulus Park offers Olympic, sprint, duathlon and aquabike formats with measured swim, bike and run distances and a range of entry options.
August 2026
A one-day multisport event in Naperville on August 2, 2026 featuring sprint triathlon, kid's triathlon, duathlon and aquabike formats at 500 Jackson Ave with several entry categories and published fees.
November 2026
Join the Turkey Dri Tri in Oak Brook for an indoor triathlon of rowing, cycling and a short track run. Friendly heats and prizes culminate with the Golden Turkey for top male and female.