School Information

Crystal Lake South is consistently ranked among the best high public schools in Illinois and offers students a comprehensive 9-12 grade education. Students have the opportunity to choose from more than 200 courses including specialized Advanced Placement®, dual credit, Project Lead the Way (PLTW), and Virtual Enterprises International (VEI).

Crystal Lake South is consistently ranked among the best public high schools nationally and in the state of Illinois. Most recently, U.S. News & World Report named it among the nation's best high schools in 2019. Chicago Magazine ranked South as the best high school in McHenry County and Niche ranked District 155 as the best district in McHenry County.

In athletics, the Crystal Lake South Gators compete in the Valley Division of the Fox Valley Conference.  Most recently, the school has captured state titles in boys’ soccer (2018), wrestling (2019), and and baseball (2017). The school has also finished in the state's top four in girls' volleyball five times dating back to 1991.

Crystal Lake South offers students 35 clubs and activities and several opportunities in performing and fine arts. The school’s production of “Peter Pan” was won Best Scenic Design from the Illinois High School Musical Theatre awards in 2018.

Crystal Lake South High School opened in 1978 and serves students from Crystal Lake and Lake in the Hills and located approximately 45 miles north­west of Chicago. The school counts television writer and producer Tom Mularz, season 1 American Idol finalist Jim Varraros among its alumni and former students.

Crystal Lake South 

2019 U.S. News & World Report - Best High Schools
2019 Chicago Magazine - Best School in McHenry County

Crystal Lake South: 1,480
District 155: 5,973

D155 Average Class Size: 20

Teachers with a 
Master's Degree or Higher
: 86%

4-Year Graduation Rate
Crystal Lake South:
District 155: 96%
State: 86%

Scholarships earned in 2018-2019: $2,066,965

Students continuing their education: 89% 

2018-2019 SAT Average
Crystal Lake South ELA: 528.3
Crystal Lake South Math: 534.4

District 155 ELA: 528.9
District 155 Math: 538.1

State ELA: 497.5
State Math: 497

District 155 Dual Credit Courses & Enrollment

Autos II                                      18
     -McHenry County College
Advanced Culinary Arts Commercial                              11
     -McHenry County College  
Calculus                                     7
     - University of Illinois
Computer Business App.       313
      -McHenry County College
Culinary Arts II Commercial    26
      -McHenry County College
Marketing                                   103
      -McHenry County College
Music Appreciation                   12
      -McHenry County College
Spanish IV                                  330
      -McHenry County College