Illinois
Illinois Triathlon Calendar 2025-2026
Explore the best triathlons in Illinois for 2025-2026! Our updated list features 20 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!
March 2025
The CORE Indoor Sprint Triathlon is a competitive event taking place in Lemont, Illinois, where participants engage in a unique indoor triathlon format. Athletes will swim for 10 minutes, bike for 15..
April 2025
The Together We Tri Indoor Triathlon is an engaging multi-sport event taking place at the Glenview Park Center in Glenview, Illinois. Participants can expect a 10-minute pool swim, a 20-minute ride on..
May 2025
The Pioneer Spirit Triathlon, taking place in Petersburg, IL, features a variety of events including a 5k run/walk, mini triathlon, sprint triathlon, and a tri-challenge. This mid-spring tri-series ca..
The QCKG Tri-It Mini Triathlon is an exciting annual event taking place in Colona, Illinois. Participants will engage in a fun and family-friendly course that includes a 10K kayak, a 10-mile bike ride..
The Lake Lou Yaeger Triathlon, taking place in Litchfield, Illinois, offers a variety of race options for athletes, including individual and relay triathlons, aquabike events, and a special high schoo..
The LIFT Duathlon event features a variety of activities including a 5K run/walk, a duathlon consisting of a 5K run, a 12.5-mile bike ride, and a 1-mile run, as well as a 1-mile fun run suitable for f..
June 2025
The Tri-Shark Classic is a premier triathlon and duathlon event taking place in Hudson, Illinois. Scheduled for June 7, 2025, the event features a variety of competitions, including a triathlon, duath..
The Prairie Triathlon at NorthPointe is a vibrant sporting event taking place in Roscoe, Illinois. Scheduled for June 14, 2025, it features a NorthPointe Prairie Triathlon and a Team Relay option. Par..
The IRONMAN 70.3 Rockford, Illinois, is an exciting triathlon event that features a swim in the scenic Rock River, a picturesque bike ride through rural Illinois, and a flat run along beautiful trails..
The Tremont Triathlon, scheduled for June 28, 2025, in Tremont, Illinois, features a variety of events catering to different skill levels. Participants can choose from the Main Triathlon, which includ..
July 2025
The Mattoon-Man is an exciting triathlon event taking place at Lake Mattoon, Neoga, IL. Scheduled for July 12, 2025, this event features various competitions, including Sprint and International Triath..
The Crystal Lake Aquathon, taking place on July 20, 2025, at Three Oaks Recreation Area in Crystal Lake, IL, is the only aquathon event in Illinois. This annual competition features various timed race..
The Lake Springfield Triathlon, scheduled for July 26, 2025, in Springfield, Illinois, offers a variety of competitive events for athletes of all levels. Participants can choose from individual and re..
August 2025
The Booster Bash Triathlon and 5K is an exciting athletic event organized by the Salem Wildcat Booster Club, taking place at the Salem Family Aquatic Center in Salem, Illinois. Participants can choose..
The Sage City Triathlon, organized by Kirby Medical Center and the City of Monticello, is set to take place in Monticello, Illinois. This annual event features a variety of races, including a Sprint T..
The Forge Gravel Triathlon is an exciting multi-sport event scheduled for August 16, 2025, in Lemont, Illinois. This USAT-sanctioned race features a short course triathlon, a duathlon, and relay optio..
September 2025
The Harvest Hammer Duathlon is an exciting athletic event taking place in Morrison, Illinois, featuring a 5k run and a 21-mile bike ride for participants. Individuals can choose to compete solo or for..
The Carlyle Lake Triathlon, scheduled for September 21, 2025, in Carlyle Township, IL, offers a variety of events catering to different skill levels. Participants can choose from individual and relay..
October 2025
The Castle Creek Triathlon, organized by 4 Peaks Racing, is a challenging multisport event featuring various race formats including sprint and Olympic distance triathlons, aquabike, duathlon, and kaya..
The Mattoon Last Chance Triathlon is a competitive event held in Mattoon, Illinois, featuring a 275-yard indoor pool swim, a 12-mile bike ride, and a 3.1-mile run. All segments of the triathlon start..
