Chicago’s lakefront will transform into the ultimate endurance playground when the Chicago Triathlon by Supertri takes over the city August 23–24. And the 2025 edition is shaping up to be the biggest in the event’s history —w ith registration already outpacing last year’s 7,500 participants, organizers expect record-breaking numbers when it comes to athletes, fundraising and community involvement.

The course is pure Chicago magic: Athletes plunge into Lake Michigan, navigate a bike ride through downtown and cap it all off with a run that ends at a finish line in Grant Park. Whether you’re a first-timer testing your grit, a seasoned triathlete chasing a new personal record or a paratriathlete proving nothing is off-limits, this is a weekend where everyone belongs at the start line.

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