Grayslake Central High School is a public four-year high school located in Grayslake, Illinois and is part of Grayslake Community High School District 127. Founded in 1946, the school services the Chicago suburbs of Grayslake, Hainesville, and parts of Round Lake. The school's mascot is the Ram.
Serving 1,375 students in grades 9-12, Grayslake Central High School ranks in the top 30% of all schools in Illinois for overall test scores (math proficiency is top 50%, and reading proficiency is top 50%).
The percentage of students achieving proficiency in math is 29% (which is higher than the Illinois state average of 27%). The percentage of students achieving proficiency in reading/language arts is 47% (which is higher than the Illinois state average of 30%).
The student-teacher ratio of 13:1 is equal to the Illinois state level of 13:1.
Minority enrollment is 42% of the student body (majority Hispanic), which is lower than the Illinois state average of 55% (majority Hispanic).
Quick Facts (2026-27)
- Grades: 9-12
- Enrollment: 1,375 students
- Student-Teacher Ratio: 13:1
- Minority Enrollment: 42%
- Graduation Rate: 97% (Top 1% in IL)
- Overall Testing Rank: Top 30%
- Math Proficiency: 29% (Top 50%)
- Reading Proficiency: 47% (Top 20%)
- Science Proficiency: 67% (Top 20%)
- Attendance Zone: Grayslake Central High School serves the southern part of Grayslake, IL, covering an area of approximately 13.7 square miles. Most families can expect a drive of 5-10 minutes to reach the school, with the average distance to the zone's edge being around 2.7 miles and the furthest edge located about 5.1 miles away.
- Source: National Center for Education Statistics (NCES), IL Dept. of Education
Top Rankings
Grayslake Central High School ranks among the top 20% of public schools in Illinois for:
Category
Attribute
Most improved public schools
Reading/Language Arts Proficiency
Science Proficiency
Graduation Rate
School Overview
Grayslake Central High School's student population of 1,375 students has stayed relatively flat over five school years.
The teacher population of 106 teachers has grown by 12% over five school years.
Grades Offered
Grades 9-12
Total Students
1,375 students
Total Classroom Teachers
106 teachers
Year Founded
1946
School Rankings
Grayslake Central High School ranks within the top 30% of all 3,542 schools in Illinois (based off of combined math and reading proficiency testing data).
The diversity score of Grayslake Central High School is 0.61, which is less than the diversity score at state average of 0.70. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#869 out of 3542 schools
(Top 30%)
(Top 30%)
Math Test Scores (% Proficient)
29%
27%
Reading/Language Arts Test Scores (% Proficient)
47%
30%
Science Test Scores (% Proficient)
67%
50%
Student-Teacher Ratio
13:1
13:1
American Indian
n/a
n/a
Asian
8%
6%
Hispanic
22%
29%
Black
7%
16%
White
58%
45%
Hawaiian
n/a
n/a
Two or more races
5%
4%
All Ethnic Groups
Graduation Rate
97%
87%
Chronically Absent Students
(22-23)16.2%
29.7%
Eligible for Free Lunch
11%
43%
School Statewide Testing
School District Name
Sports
Colors
White, Green
School Mascot
Aries The Ram
Source: National Center for Education Statistics (NCES), IL Dept. of Education
Frequently Asked Questions
What is Grayslake Central High School's ranking?
Grayslake Central High School is ranked #869 out of 3,542 schools, which ranks it among the top 30% of public schools in Illinois.
What schools are Grayslake Central High School often compared to?
Grayslake Central High Schoolis often viewed alongside schools like Grayslake North High School, Warren Township High School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
29% of students have achieved math proficiency (compared to the 27% IL state average), while 47% of students have achieved reading proficiency (compared to the 30% IL state average).
What is the graduation rate of Grayslake Central High School?
The graduation rate of Grayslake Central High School is 97%, which is higher than the Illinois state average of 87%.
How many students attend Grayslake Central High School?
1,375 students attend Grayslake Central High School.
What is the racial composition of the student body?
58% of Grayslake Central High School students are White, 22% of students are Hispanic, 8% of students are Asian, 7% of students are Black, and 5% of students are Two or more races.
What is the student-teacher ratio of Grayslake Central High School?
Grayslake Central High School has a student ration of 13:1, which is equal to the Illinois state average of 13:1.
What grades does Grayslake Central High School offer ?
Grayslake Central High School offers enrollment in grades 9-12
What school district is Grayslake Central High School part of?
Grayslake Central High School is part of Grayslake CHSD 127 School District.
School Calendar
View the Grayslake Central High School yearly calendar below. Note key dates such as:
Event
Date
First Day for Boys Bowling, Cheer, Dance, Girls Wrestling
October 26, 2026 (Monday)
First Day for Girls Basketball
November 02, 2026 (Monday)
First Day for Boys Basketball & Boys Wrestling
November 09, 2026 (Monday)
First Day for Girls Bowling
November 16, 2026 (Monday)
Thanksgiving Break - No School
November 25, 2026 (Wednesday)
School Reviews
Review Grayslake Central High School. Reviews should be a few sentences in length. Please include any comments on:
- Quality of academic programs, teachers, and facilities
- Availability of music, art, sports and other extracurricular activities
Recent Articles
What Makes an Elementary School Feel Supportive?
Discover what makes one elementary school more supportive than another, from teacher relationships and family communication to classroom attention, belonging, student services, leadership, routines, and responsive academic support systems.
Second School Tour: Questions Parents Forget to Ask
A second school tour can reveal what families miss initially. Learn which questions to ask about teachers, support, schedules, safety, communication, programs, and everyday student life before enrolling.
Attendance Policies Are Changing: Parent Guide 2026
Attendance policies are changing across public schools. Learn what parents should examine about absences, tardiness, interventions, flexibility, communication, and student support before choosing a school for their child today.
