Illinois
Illinois Triathlon Calendar 2025-2026
Explore the best triathlons in Illinois for 2025-2026! Our updated list features 17 exciting races across the region. Find your next race in Illinois below and join the running community at these great events!
June 2025
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 Saluki Triathlon & Duathlon, held in Carbondale, Illinois, is a sprint-distance event hosted by SIU Recreational Sports and Services. The triathlon features a 0.2-mile swim in SIU Campus Lake, a 5..
The Eiffel Tower Triathlon, held annually in Paris, Illinois, offers both Sprint and Olympic distance races at East Lake Park. The Sprint includes a 500-meter swim, 20k bike, and 5k run, while the Oly..
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 offers multiple timed race options including a Spr..
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 Millstadt Parks Biathlon & 5K, held annually in Millstadt, Illinois, features a challenging biathlon consisting of a 5-mile run through scenic farmland followed by a 22-mile bike ride with high-sp..
The Harvest Hammer Duathlon, held in Morrison, Illinois, offers a dynamic race experience featuring a 5K run combined with a 21-mile bike ride for duathletes. Participants can also choose to run only..
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, held at Lake Pleasant's Castle Creek Boat Ramp in Arizona, offers a challenging multisport experience set against the stunning Southwestern desert landscape. Participants c..
The Mattoon Last Chance Triathlon, held in Mattoon, Illinois, features a sprint-distance course starting and finishing at the Mattoon Area Family YMCA. The race includes a 275-yard indoor pool swim, a..
February 2026
The YMCA Dry Tri in Toledo, Illinois, offers a unique indoor triathlon experience at the Neal Center YMCA. Instead of traditional swimming, biking, and running outdoors, participants complete a 10-min..
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