Illinois
Illinois Triathlon Calendar 2025-2026
Explore the best triathlons in Illinois for 2025-2026! Our updated list features 21 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!
May 2025
The Pioneer Spirit Triathlon, held in Petersburg, IL, features a variety of events including a 5k run/walk, mini triathlon, sprint triathlon, and a tri-challenge. This mid-spring event caters to both..
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 participants. Athletes can choose from events such as the Sprint Individual Triathlon, Sprint..
The LIFT Duathlon, along with a 5K run/walk and a 1 Mile Fun Run, is set to take place in Mattoon, Illinois. This community-focused event features a variety of activities, including a challenging duat..
The JALC Tri-Festa Triathlon, scheduled for May 24, 2025, in Carterville, IL, is an exciting multi-sport event organized by Logan Fitness in collaboration with HerrinFesta Italiana. Participants can c..
The Capital City Biathlon & 5K is an exciting athletic event scheduled for May 24, 2025, at Danenberger Family Vineyards in New Berlin, Illinois. Participants can choose from several events, including..
June 2025
The Tri-Shark Classic is a premier triathlon and duathlon event held in Hudson, Illinois, featuring a flat and fast course through Comlara Park. Scheduled for June 7, 2025, the event includes various..
The Fox Lake Sprint Triathlon, held annually in Fox Lake, Illinois, is a USAT-sanctioned event featuring a 750-yard swim in Nippersink Lake, a 12-mile bike course with rolling hills, and a 3.1-mile ou..
The Prairie Triathlon at NorthPointe is a dynamic event scheduled for June 14, 2025, in Roscoe, Illinois. This triathlon features a 350-yard swim in a seven-lane pool, followed by a 17-mile bike ride..
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 is a multi-sport event taking place in Tremont, Illinois, featuring various race formats to accommodate participants of all skill levels. The main triathlon includes a 400-yard s..
July 2025
The Mattoon-Man is an exciting triathlon event taking place at Lake Mattoon, featuring a variety of competitions including Sprint and International Triathlons for both individuals and teams. This year..
The Crystal Lake Aquathon, held annually at Three Oaks Recreation Area in Crystal Lake, Illinois, is the state's only aquathon event. The 8th edition in 2025 offers multiple timed race options includi..
The Lake Springfield Triathlon is a popular multi-sport event scheduled for July 26, 2025, in Springfield, Illinois. Participants can choose from various race formats, including individual and relay o..
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, hosted by Kirby Medical Center and the City of Monticello, is an annual event designed for both beginner and elite triathletes. Scheduled for August 9, 2025, it features a Spr..
The Forge Gravel Triathlon is an exciting multi-sport event scheduled for August 16, 2025, in Lemont, Illinois. This unique triathlon features a short course designed for athletes of all skill levels,..
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, is an exciting multi-sport event held in Carlyle Township, Illinois. Participants can choose from various events, including Sprint and Oly..
October 2025
The Castle Creek Triathlon, organized by 4 Peaks Racing, is an exciting endurance event set against the stunning backdrop of the Southwestern landscape. Participants can choose from various categories..
