Description

Registration is now open for the 9th Annual Crystal Lake Aquathon, taking place Sunday, July 19 at Three Oaks Recreation Area. Hosted by Smith Physical Therapy+, this unique event is one of the only Aquathon in Illinois and offers a challenging yet accessible race experience for athletes of all levels. All proceeds from the event benefit Girls on the Run of Northwest Illinois, a nonprofit dedicated to empowering young girls through mentorship, physical activity, and confidence-building programs. Participants will swim a scenic quarry loop around three islands before transitioning to a run course featuring a mix of trails, sand, and pavement, all set within the beautiful Three Oaks Recreation Area. 

2025 Race Options Sprint Distance: 

500m swim + 5K run 

Olympic Distance: 1-mile swim + 10K run 

Swim Only: 2-mile Swim Only: 1-mile (timed; not eligible for awards) 

Kids Aquathon: 250m swim + 1-mile run 

Adaptive 1-Mile Swim: available for participants needing additional support 

Event Details 

What: 9th Annual Crystal Lake Aquathon 

Who: Hosted by Smith Physical Therapy+ Benefiting: Girls on the Run of Northwest Illinois 

When: Sunday, July 19 2026 | 7:00 AM start 

Where: Three Oaks Recreation Area ~ 5517 Northwest Highway, Crystal Lake, IL 60014 

Pricing for the event is determined by the specific event selected and the date of registration. Please refer to the registration link for current and accurate pricing details. Register soon for the best pricing and to be part of this one-of-a-kind event!