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Upcoming Events view full calendar Saturday May 18 Graduation - 10:00 am Subscribe to Alerts all day Read More about Graduation - 10:00 am Monday May 20 Final Exams (Final Exam Schedule) Subscribe to Alerts all day Read More about Final Exams (Final Exam Schedule) Tuesday May 21 Final Exams (Final Exam Schedule) Subscribe to Alerts all day Read More about Final Exams (Final Exam Schedule) Tuesday May 21 Board of Education Meeting Subscribe to Alerts 7 : 00 PM - 9 : 00 PM Board Room, District 155 Center for Education, 1 S Virginia Road, Crystal Lake, IL 60014 Read More about Board of Education Meeting Tuesday June 18 Board of Education Meeting Subscribe to Alerts 7 : 00 PM - 9 : 00 PM Board Room, District 155 Center for Education, 1 S Virginia Road, Crystal Lake, IL 60014 Read More about Board of Education Meeting Recent News View all news CLS Presents "Matilda" Performance DatesTimes: February 2324 - 7:00 p.m. March 12 - 7:00 p.m. March 2- 1:00 p.m. Ticket Information: Tickets are $13 each, click the link below to purchase tickets: Purchase Tickets Read More about CLS Presents "Matilda" CLS, CG Students Take Virtual Businesses to VEI Leadership Conference and Trade Show Read More about CLS, CG Students Take Virtual Businesses to VEI Leadership Conference and Trade Show CLS Students Perform for Veterans A Veterans Day tradition at Crystal Lake South is meaningful to both community veterans and the students who participate in the musical tour. Band and choir students from Crystal Lake South made 22 stops on Friday, November 10 to play music for 26 veterans in the community. Read More about CLS Students Perform for Veterans German Students Visit D155 with GAPP Exchange District 155 welcomed 24 students from Holzgerlingen, Germany from October 18 to November 1 as part of the German American Partnership Program (GAPP). The German students were hosted by nine students from Crystal Lake Central and 15 from Crystal Lake South, who will be making a trip to Germany in June. Read More about German Students Visit D155 with GAPP Exchange Our School by the Numbers 96% Graduation Rate 19 IHSA Varsity Sport Team Academic Awards 557 Students Completed Early College Coursework RAMP National Certification-Student Services $6.2M earned in scholarships by the Class of 2021 89% of Faculty Members with Master's Degree or Higher AVID Emerging School-Wide Distinction 5 National Merit Finalists 88% of the Class of 2021 Graduates Continuing their Education Stay Connected View our Instagram Crystal Lake South High School 1200 South McHenry Avenue, Crystal Lake, IL 60014 Phone: 815-455-3860 Attendance Hotline: 815-893-5270 Twitter (opens in new window/tab) Facebook Instagram Accessibility Report a Concern School Boundary Map Careers Powered by...