9th Annual Crystal Lake Aquathon

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.

2026 Sponsors Wanted!
We’re excited to kick off the 2026 race season and are now seeking sponsors to join us! Showcase your brand to local athletes, spectators, and the community while supporting a fun and active event. Check out our 2026 Sponsorship Packet to see all the ways you can get involved.

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! 

Stay updated by following The Crystal Lake Half Marathon on Facebook and Instagram.

Volunteer information can be found here.