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 26 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!
August 2026
September 2026
Challenge yourself at the Harvest Hammer Duathlon in Morrison: a 5k run followed by a 21 mile bike, with run only and team entries allowed. Family friendly youth races, prizes, chip timing and Rotary supported proceeds make it a highlight.
Join the Carlyle Lake Triathlon at Dam West Beach on Sept 20, 2026, featuring sprint and Olympic courses plus duathlon, aquabike and relay options for every level. Celebrate your finish with a beachside festival of food, music and awards.
October 2026
Test yourself at the Mattoon Last Chance Tri at the Mattoon Area Family YMCA with a 275 yard indoor swim, 12 mile bike and 3.1 mile run. Register by September 12, 2025 for a tech shirt and race solo or on a team.
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.