Crystal Lake South High School
For All Students. For Each Student.
Current Families
We partner with families to support their students’ educational journey, ensuring students enter with promise and leave with purpose.
New Families
We foster belonging, strong relationships, and provide relevant, engaging coursework so every student feels known, supported, and challenged.
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November 9, 2026
The Crystal Lake South boys soccer team finished its 2026 season with a second-place finish in the IHSA 2A boys soccer state series, marking its fourth state appearance in the last eight years.
October 23, 2026
Over 180 students participated in D155’s third annual Latinx Summit at McHenry County Community College on Friday, October 16.
September 11, 2026
Crystal Lake South Girls Flag Football Head Coach Ryan Felz was named Girls Flag Coach of the Week by the Chicago Bears on September 8.
August 25, 2026
For the eighth consecutive year, all four Community High School District 155 high schools have been ranked among the top 19% of public high schools in the nation by U.S. News & World Report.
July 9, 2026
Athletic Registration for the 26/27 School year is now open. Registration must be completed on the Arbiter Registration Website PRIOR to tryouts/practices. If you have not yet registered your stude...
May 11, 2026
Crystal Lake South teacher Michelle Kidd was honored by the Crystal Lake Chamber of Commerce with the Inaugural Robert & Rosemary Blazier Memorial Award on May 7.
April 21, 2026
Cullen Perri and Temire Onome-Ojigbo place second at McHenry County College High School Culinary Challenge, making four identical dishes in 90 minutes.
April 20, 2026
The CLS math team had 14 students represent the school at the state finals with two seniors finishing second in the oral competition
