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Upcoming Triathlons in Illinois

CORE Indoor Sprint Triathlon

LEMONT, IL

March 14, 2026

Super Sprint

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St Charles Splash and Dash

Saint Charles, IL

April 26, 2026

Youth

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Chain of Rocks Bridge Duathlon

Granite City, IL

May 3, 2026

Duathlon

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Pioneer Spirit Triathlon - Sprint, Mini, & Challenge | 5k Run

Petersburg, IL

May 9, 2026

Sprint

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Lake Lou Yaeger Triathlon

Litchfield, IL

May 17, 2026

OlympicSprintAquabike

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Capital City Biathlon & 5K

New Berlin, IL

May 23, 2026

Duathlon

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JALC Tri-Festa Triathlon

Carterville, IL

May 23, 2026

Sprint

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MMTT Youth Triathlon

Geneva, IL

May 24, 2026

Youth

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Tri-Shark Classic

Hudson, IL

June 6, 2026

SprintDuathlon

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Tom's Try-athlon Oak Brook Park District

Oak Brook, IL

June 6, 2026

Youth

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Fox Lake Sprint Triathlon

Fox Lake, IL

June 7, 2026

Sprint

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The Prairie Triathlon at NorthPointe

Roscoe, IL

June 13, 2026

Sprint

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The Why Not Tri

OAK BROOK, IL

June 13, 2026

Sprint

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Eiffel Tower Triathlon

Paris, IL

June 13, 2026

OlympicSprint

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Tri2BeatMS

Chillicothe, IL

June 13, 2026

Youth

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Tremont Triathlon

Tremont, IL

June 20, 2026

SprintSuper Sprint

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Ironman 70.3 Rockford Illinois

Rockford, IL

June 21, 2026

Half Iron

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Lytle Park Tri

Mattoon, IL

July 4, 2026

Sprint

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Springfield Kids Triathlon

Springfield, IL

July 11, 2026

Youth

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MTC Zilla Tri

Columbia, IL

July 12, 2026

SprintYouth

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Lake Zurich Triathlon

Lake Zurich, IL

July 12, 2026

OlympicSprintAquabikeDuathlon

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C-U Triathlon

Champaign, IL

July 19, 2026

Sprint

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Crystal Lake Aquathon - 2026

Crystal Lake, IL

July 19, 2026

Aquathlon

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MMTT Splash and Dash - Geneva

Geneva, IL

July 22, 2026

Youth

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Lake Springfield Triathlon

Springfield, IL

July 25, 2026

Half IronOlympicSprintAquabike

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Wauconda Kids Triathlon

Wauconda, IL

July 25, 2026

Youth

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Wauconda Triathlon

Wauconda, IL

July 26, 2026

OlympicSprint

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Naperville Sprint Triathlon

Naperville, IL

August 2, 2026

SprintDuathlonYouth

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White Squirrel Kids Triathlon

Olney, IL

August 7, 2026

Youth

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Sage City Triathlon

Monticello, IL

August 8, 2026

SprintSuper Sprint

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White Squirrel Triathlon

Olney, IL

August 9, 2026

Sprint

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North Shore Youth Triathlon

Evanston, IL

August 16, 2026

Youth

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Chicago Triathlon and Kids Tri

Chicago, IL

August 22, 2026

OlympicSprintSuper SprintYouth

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Carlyle Lake Triathlon

Carlyle, IL

September 20, 2026

OlympicSprintAquabike

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Have Fun? You Won! Kids Triathlon

Oswego, IL

September 27, 2026

Youth

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Turkey Dri Tri Oak Brook Park District

Oak Brook, IL

November 22, 2026

Dry Tri

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Wildcat Indoor Triathlon

Evanston, IL

February 21, 2027

Super Sprint

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Finding the Right Illinois Triathlon

Whether you are looking for a beginnger-friendly Sprint in Illinois or a challenging 70.3, Lets Race provides the most up-to-date calendar for triathletes. Our Illinois list is updated daily to include Ironman, Olympic, and local club races.