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Crystal Lake South High School is a public, four-year high school with an enrollment of 1,385 students. Located approximately 45 miles northwest of Chicago, the school serves the cities of Crystal Lake and Lake in the Hills. Crystal Lake South offers a comprehensive curriculum and extracurricular activities to help students expand their academic and social skills, learn about themselves, engage in positive experiences, and be involved with community outreach. There are 24 varsity sports, 1 club sport, and 35 school activities.

In 2020, Crystal Lake South earned a spot in the top 100 Best Public High Schools for 2020 in Illinois by U.S. News & World Report for the second consecutive year. In 2017, the Washington Post named Crystal Lake South one of “America’s Most Challenging High Schools.”

In District 155, 83% of teachers hold a master’s degree. The teacher-student ratio is 20:1. The school also employs five counselors, two social workers, one nurse, and one psychologist on its student services team.

Community High School District 155 includes four comprehensive high schools and one alternate education campus. Serving grades 9-12, each institution has full State of Illinois recognition and accreditation. Enrollment includes approximately 6,012 students from McHenry and Lake counties.

Grade Point Average: Class of 2020

Graduation Requirements

Computer Education..............................................................................0.5 credits
English......................................................................................................4.0 credits
Social Science*........................................................................................2.0 credits
Science.....................................................................................................2.0 credits
Mathematics...........................................................................................3.0 credits
Elective Courses**.................................................................................6.0 credits
Consumer Education***.......................................................................0.25 credits
Classroom Drivers Education...............................................................0.25 credits
Physical Education & Health.................................................................2.25 credits
Total for Graduation.....................................................................20.25 credits

All freshmen must take Freshmen Seminar, a decision-making and career awareness course.

*One year must be U.S. History including passing marks on Federal and State Constitution tests.
**One credit of electives must be in art, foreign language, music, or vocational education.
***Requirement may be completed through some business classes, family and consumer science courses, or the Cooperative Education program.

Semester Grade Determination

Semester grades are calculated based on weighted categories of formative and summative assessments and a possible final exam. Percentages assigned to each category may vary based on course, with the potential final exam counting for no more than 20% of the overall grade.

Summer School

Summer school grades are indicated on the transcript with (SS). There are two sessions, each three weeks in length, with classes meeting five days per week. One half-credit is granted for successful completion of each three-week session.

Course Listing

District 155 offers a full array of courses to challenge and enhance its students' learning. To view a complete course catalog choose "Course Selection Guide" from the links list at www.d155.org.

District 155 separates courses into three categories: General (G), Honors (H), and Advanced Placement (AP). The grade point average (GPA) for these classes is calculated using the following scale:

Class of 2020 Matriculations

Crystal Lake South Class of 2020

Top Colleges:

  1. Illinois State University (13)
  2. University of Illinois (Chicago) (8)
  3. Iowa State University (8)
  4. University of Illinois (Urbana-Champaign) (7)
  5. University of Wisconsin Whitewater (7)
  6. University of Missouri-Columbia (5)
  7. Ball State University (4)
  8. Loras College (4)
  9. Purdue University (4)
  10. University of Wisconsin-Milwaukee

Top 5 Out-of-State College Destinations:

  • Wisconsin (29)
  • Iowa (18)
  • Indiana (11)
  • Arizona (6)
  • Missouri (8)

College representatives are invited to visit Crystal Lake South throughout the school year. To schedule and appointment, contact the College & Career Center supervisor at 815-477-6907 ext. 3279.

Advanced Placement® Testing

Class of 2021 SAT Scores

Due to the limited access to testing opportunities as a result of the global pandemic, D155 is not publishing average SAT scores for the Class of 2021.  We appreciate the holistic, test-optional approach colleges and universities are using to determine admission for students.

Please note: This page contains links to documents that are in Adobe's PDF format.  If you have accessibility needs that make it difficult for you to access and / or interpret information in PDF format, please call 815-455-8500 or email distmail@d155.org, and we will be happy to assist you. 

Contact Us

Carson Sterchi
Student Services Coordinator
Phone: (815) 455-3860 Ext. 3228
Email: csterchi@d155.org

Terri Fleter
Student Services Secretary
Phone: (815) 455-3860 Ext. 3226
Email: tfleter@d155.org

Kathy McCowan
Registrar
Phone: (815) 455-3860 Ext. 3215
Email: kmccowan@d155.org

Karen Audette
College & Career Center
Phone: (815) 455-3860 Ext. 3279
Email: kaudette@d155.org