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What's the vibe like in the hallways at Crystal Lake Central High School right now?
Community prompt from u/allk12. Replies below.
Enrollment
1,443
High
DISTRICT 1,301 · STATE 834
SCHOOL COMMUNITY·CHSD 155·NCES 171137001367
Crystal Lake Central High School
45 W Franklin Ave, Crystal Lake, IL 60014 · (815) 459-2505 · McHenry County
GRADES 09–12HIGH21-SUBURBREGULAR SCHOOL1,443 STUDENTS
B+
allk12 Grade
Scored higher than 70% of Illinois public high schools
- B+Test scores Share of students meeting the state standard in reading, math, and other tested subjects, 2023-24 and 2024-25.
- BBeats expectations How far test scores land above or below what the share of low-income students predicts for a school in this state.
- ·Three-year trend Not available for this school, so the grade uses the other parts.
Grades compare a school only with schools in the same state, because every state gives its own test. How grades work · Top-graded Illinois public high schools
Student : Teacher
16.9:1
85 FTE teachers
DISTRICT 16.9:1 · STATE 13.8:1
Free / Reduced Lunch
35%
510 students
DISTRICT 29% · STATE 56%
Community
5
0 members
Enrollment and student:teacher ratio compared against other high schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade, 2024-25
| Grade | Students | Share |
|---|---|---|
| Grade 9 | 353 | 24% |
| Grade 10 | 364 | 25% |
| Grade 11 | 342 | 24% |
| Grade 12 | 384 | 27% |
Student demographics
51%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 46% · STATE 69% · US 70%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
BeatsExpectations
Demographically-adjusted score · methodologyTier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
45.3%
composite math + reading, all grades
Predicted
51.1%
based on IL schools with similar FRL share
Beats by
-5.9pp
below demographic expectation
What this means: About 45% of students here test proficient in math and reading, compared with the roughly 51% typical for Illinois schools with a similar share of low-income students. BeatsExpectations measures results against demographically similar schools rather than by raw scores, and this school falls within the typical range, neither among Illinois's top nor bottom 10%.
BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →
Schools most like Crystal Lake Central High School
Crystal Lake Central High School's state test result (45.3% proficient) is higher than 4 of the 5 schools below with a result.
| School | Students | Low-income | Proficient |
|---|---|---|---|
| Crystal Lake Central High School this school | 1,443 | 35.3% | 45.3% |
| Wauconda High School Wauconda | 1,452 | 35.5% | 44.4% |
| Crystal Lake South High School Crystal Lake | 1,279 | 32.1% | 46.5% |
| Plainfield High School Plainfield | 1,800 | 34.7% | 40.6% |
| McHenry Community High School Mchenry | 2,214 | 37.7% | 39.3% |
| Woodstock North High School Woodstock | 915 | 40.3% | 42.8% |
Matched among Illinois high schools on enrollment, the share of students from low-income families (eligible for free or reduced-price lunch), and racial and ethnic makeup. Proficient is the average share of students meeting the state standard across all of the school's state tests in 2023-24 and 2024-25, the same combined score our test-score rankings use. Online schools and schools serving specialized populations are not matched.
Where Crystal Lake Central High School ranks
Among high schools| Measure | This school | In Illinois | In McHenry County |
|---|---|---|---|
| State test proficiency ranked highest first | 45.3% | #128 of 573 | #7 of 13 |
| Enrollment ranked largest first | 1,443 | #152 of 708 | #4 of 14 |
| Students per teacher ranked fewest first | 16.9:1 | #457 of 528 | #12 of 13 |
| Diversity index ranked most diverse first | 50.8% | #175 of 537 | #5 of 13 |
| Free and reduced lunch ranked highest share first | 35.3% | #461 of 578 | #7 of 13 |
| Enrollment change since 2017-18 ranked steepest decline first | -4.3% | #271 of 358 | #8 of 10 |
Ranked against other public high schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.
4-year change
SY 2020-21 vs SY 2024-25Enrollment
1,443
-43 (-3%) vs 2020
+11% since 1990-91, when it was 1,296
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free and reduced lunch |
|---|---|---|---|---|
| 2024-25 | 1,443 | 85.3 | 16.9:1 | 35% (510) |
| 2023-24 | 1,498 | 83.7 | 17.9:1 | 36% (536) |
| 2022-23 | 1,470 | 87.2 | 16.9:1 | 36% (526) |
| 2020-21 | 1,486 | N/A | N/A | N/A |
| 2017-18 | 1,508 | 80.4 | 18.8:1 | 29% (443) |
| 2015-16 | 1,540 | 87 | 17.7:1 | 23% (358) |
| 2010-11 | 1,572 | 88 | 17.9:1 | 20% (312) |
| 2000-01 | 1,245 | 67 | 18.6:1 | N/A |
| 1990-91 | 1,296 | 77 | 16.8:1 | N/A |
Source: NCES Common Core of Data. Rows are the federal collections on file for Crystal Lake Central High School.
Since 2017-18: students down 4% (1,508 to 1,443); teachers up 6% (80.4 to 85.3).
About Crystal Lake Central High School
A large high school in Crystal Lake, Illinois, Crystal Lake Central High School is part of CHSD 155. Its 1,443 students are spread across grades 9 through 12. The typical figure for high schools in Illinois is about 834 students.
Crystal Lake Central High School is one of the 4 schools that make up CHSD 155 (5,203 students in total).
A majority of students at Crystal Lake Central High School, 64%, are White. Next come 28% Hispanic, 3% Asian, and 3% multiracial. The county population is about 80% White. Crystal Lake Central High School has a diversity index of 51%, compared with 70% for all US public school students.
The teaching staff at Crystal Lake Central High School is 85.3 full-time-equivalent teachers, and the ratio is 16.9:1. The average ratio among high schools in Illinois is 13.8:1, lower than at this school. About 35% of students, or 510, qualify for free or reduced-price lunch. That is close to the 35% average for public schools in McHenry County.
The allk12 Grade for Crystal Lake Central High School is B+. Compared with Illinois public high schools, the school scored higher than 70% on a mix of test scores, poverty-adjusted results, and recent trend.
On a poverty-adjusted basis, Crystal Lake Central High School falls in the middle 80% of Illinois schools: 45.3% actual against 51.1% predicted.
McHenry County has about 312,591 residents, and median household income is about $104,802, about 35% of adults have at least a bachelor's degree, and roughly 4% of residents are in poverty. Federal data list 89 public schools in McHenry County, with a combined enrollment of about 50,123.
Nearest public school: Husmann Elementary School, about 0.2 miles away. The five-mile area around Crystal Lake Central High School holds at least 8 other public schools. Crystal Lake Central High School ranks 5th of 9 among nearby schools on average proficiency, with 45.3% against a local average of 45.0%.
NCES assigns Crystal Lake Central High School the locale Suburb: Large, meaning in a suburban area outside a principal city, within an urbanized area with a population of 250,000 or more.
The 2024-25 enrollment of 1,443 was 3% lower than in 2020-21, when it was 1,486.
If you have questions about sports schedules, lunch menus, and spirit week at Crystal Lake Central High School, you can post them here. Posting is open to anyone connected to the school.
McHenry County at a glance
View full county profilePopulation
312,591
Census ACS
Median income
$104,802
Household, ACS
Bachelor's+
35%
Adults 25+
Poverty rate
4%
Below federal line
Schools in county
89
50,123 students
Quick facts
Related schools
Other schools in CHSD 155
- Cary-Grove Community High SchoolHigh · 1,348 students
- Crystal Lake South High SchoolHigh · 1,279 students
- Prairie Ridge High SchoolHigh · 1,133 students
- Haber Oaks CampusHigh
Other schools in Crystal Lake
- Crystal Lake South High SchoolHigh · 1,279 students
- Prairie Ridge High SchoolHigh · 1,133 students
- Hannah Beardsley Middle SchoolMiddle · 829 students
- Lundahl Middle SchoolMiddle · 797 students
- Richard F Bernotas Middle SchoolMiddle · 737 students
- North Elementary SchoolElementary · 638 students
Nearby schools
- Husmann Elementary School0.2 mi · 518
- Richard F Bernotas Middle School1.0 mi · 737
- North Elementary School1.0 mi · 638
- Hannah Beardsley Middle School1.1 mi · 829
- South Elementary School1.2 mi · 390
- Lundahl Middle School1.3 mi · 797
Frequently asked questions
About Crystal Lake Central High SchoolHow large is Crystal Lake Central High School?
Crystal Lake Central High School enrolls approximately 1,443 students in grades 09-12.
What grades does Crystal Lake Central High School serve?
Crystal Lake Central High School serves grades 09-12.
How many students per teacher at Crystal Lake Central High School?
Approximately 16.9:1 students per teacher at Crystal Lake Central High School.
How diverse is Crystal Lake Central High School?
Crystal Lake Central High School reports a student body of 64% White, 28% Hispanic, 2% Black, 3% Asian, 3% Two or more.
Who oversees Crystal Lake Central High School?
Crystal Lake Central High School is overseen by CHSD 155 in McHenry County.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.