Is Crystal Lake South High School a good school?

Crystal Lake South High School ranks 128 th of 697 Illinois high schools. SchoolDigger rates this school 4 stars out of 5.

How many students attend Crystal Lake South High School?

In the 2023-24 school year, 1,291 students attended Crystal Lake South High School.

What is the racial makeup of Crystal Lake South High School?

Students at Crystal Lake South High School are 68% White, 24% Hispanic, 4% Asian, 3% African American.

What schools feed into Crystal Lake South High School?

Crystal Lake South High School is fed by the following schools: Elementary : Glacier Ridge Elementary School Elementary : Indian Prairie Elementary School Elementary : Woods Creek Elementary School Middle : Lundahl Middle School

Crystal Lake South High School

Summary:

Crystal Lake South High School is a public high school serving 1,301 students in grades 9-12 in Crystal Lake, Illinois, which is part of the Community High School District 155. This high-performing school consistently ranks in the top 20-25% of Illinois high schools, with strong academic achievement, particularly in English Language Arts and science.

Crystal Lake South High School's four-year graduation rate has been consistently high, ranging from 93.7% to 97.6% over the past five years, which is above the state average. The school has shown strong performance across various student subgroups, including female students, male students, African American students, and English Language Learner students, often ranking in the top quartile or top half of Illinois high schools for these subgroups. The school's performance for students with disabilities and low socioeconomic status students is particularly noteworthy, with the school ranking in the top 10-15% of Illinois high schools in these categories.

While Crystal Lake South High School faces some challenges, such as a higher chronic absenteeism rate compared to the state average, it appears to be a well-resourced and equitable institution that provides a quality education to its students. The school's performance is generally comparable or slightly lower than nearby high-performing schools like Huntley High School, Cary-Grove Community High School, and Prairie Ridge High School, which are part of the Community High School District 155 or the Huntley Community School District 158.

Detail:

Public 9-12

1200 S McHenry Ave
Crystal Lake, IL 60014-7495

(815) 455-3860

District: Chsd 155

SchoolDigger Rank:
128^th of 697 Illinois High Schools

Per Pupil Expenditures: $20,217

Feeder schools for Crystal Lake South High School:

Elementary:	Glacier Ridge Elementary School
	Indian Prairie Elementary School
	Woods Creek Elementary School
Middle:	Lundahl Middle School

Student/teacher ratio: 17.2

Number of students: 1,291

Racial breakdown:

White:

68.1%

Hispanic:

24.1%

Asian:

3.8%

Free/discounted lunch recipients: 30.6%

See top rated Illinois high schools

Compare Crystal Lake South High School to nearby high schools!

Performance Trends

Compare Details Crystal Lake South High School ranks better than 81.6% of high schools in Illinois. It also ranks last among 4 ranked high schools in the Chsd 155 School District. (See more...)

Compare Details In 2024 the calculated Average Standard Score was 77.39. (See more...)

The four-year cohort graduation rate measures the percentage of students at Crystal Lake South High School who earn a standard high school diploma within four years of starting ninth grade.

The high school dropout rate measures the percentage of students who do not complete their high school education.

Chronic absenteeism in a school refers to a situation where students repeatedly miss school, with the threshold often defined as missing 10% or more of school days for any reason, excused or unexcused.

Student Body

Compare Details Racial makeup is: White (68.1%), Hispanic (24.1%), Asian (3.8%). (See more...)

Compare Details 30.6% of students are receiving a free or discounted lunch. (See more...)

Teachers

Compare Details The student/teacher ratio at Crystal Lake South High School is 17.2. 3 high schools in the Chsd 155 School District have better student/teacher ratios. (See more...)

Compare Crystal Lake South High School employs 74.9 full-time teachers.

Finance

Compare Details The average total spent per student at Crystal Lake South High School is $20,217, which is the 2^nd highest among 4 high schools in the Chsd 155 School District.

Schooldigger 2024 Rankings:

Crystal Lake South High School:

SchoolDigger ranks Crystal Lake South High School 128^th of 697 Illinois public high schools. (See Crystal Lake South High School in the ranking list.)

High School Test Score Ratings by Student Subgroup:

English Language Learner students:

Special Education students:

Low Socio Economic Status students:

Female students:

Disabled students:

Male students:

Asian students:

African American students:

Hispanic students:

White students:

Chsd 155:

SchoolDigger ranks Chsd 155 107^th of 813 Illinois school districts. (See district ranking list.)

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Rank History for Crystal Lake South High School

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Rank History for all students at Crystal Lake South High School

Year	Avg Standard Score	Statewide Rank	Total # Ranked High Schools	IL State Percentile
2003	84.29	59^th	586	89.9%
2004	77.30	108^th	592	81.8%
2005	77.79	104^th	590	82.4%
2006	84.52	69^th	596	88.4%
2007	79.77	108^th	612	82.4%
2008	81.00	101^st	624	83.8%
2009	80.01	104^th	632	83.5%
2010	79.28	114^th	643	82.3%
2011	80.15	108^th	655	83.5%
2012	83.15	90^th	665	86.5%
2013	83.91	93^rd	670	86.1%
2014	82.16	114^th	670	83.0%
2015	32.72	404^th	614	34.2%
2016	41.98	374^th	643	41.8%
2017	77.92	112^th	642	82.6%
2018	82.58	93^rd	647	85.6%
2019	84.91	87^th	701	87.6%
2021	79.67	115^th	688	83.3%
2022	83.47	95^th	699	86.4%
2023	70.67	160^th	699	77.1%
2024	77.39	128^th	697	81.6%

See the entire list of Illinois High School Rankings!

Rank History for Multi-racial students at Crystal Lake South High School

Year	Avg Standard Score	Statewide Rank	Total # Ranked High Schools	IL State Percentile	SchoolDigger Rating
2018	82.38	27^th	154	82.5%
2019	81.88	28^th	165	83.0%

See the entire list of Best Illinois High Schools for Multi-racial Students!

Rank History for English Language Learner students at Crystal Lake South High School

Year	Avg Standard Score	Statewide Rank	Total # Ranked High Schools	IL State Percentile
2022	94.39	5^th	205	97.6%
2023	30.97	159^th	217	26.7%
2024	76.55	28^th	248	88.7%

See the entire list of Best Illinois High Schools for English Language Learner Students!

Rank History for Special Education students at Crystal Lake South High School

Year	Avg Standard Score	Statewide Rank	Total # Ranked High Schools	IL State Percentile
2018	33.28	222^nd	374	40.6%
2019	76.91	50^th	473	89.4%
2021	86.72	27^th	453	94.0%
2022	68.96	60^th	493	87.8%
2023	73.73	87^th	476	81.7%
2024	86.72	59^th	482	87.8%

See the entire list of Best Illinois High Schools for Special Education Students!

Rank History for Low Socio Economic Status students at Crystal Lake South High School

Year	Avg Standard Score	Statewide Rank	Total # Ranked High Schools	IL State Percentile
2018	77.78	71^st	585	87.9%
2019	83.29	53^rd	639	91.7%
2021	88.82	49^th	611	92.0%
2022	78.22	71^st	626	88.7%
2023	59.50	213^th	644	66.9%
2024	88.56	52^nd	639	91.9%

See the entire list of Best Illinois High Schools for Low Socio Economic Status Students!

Rank History for Female students at Crystal Lake South High School

Year	Avg Standard Score	Statewide Rank	Total # Ranked High Schools	IL State Percentile
2018	76.58	126^th	620	79.7%
2019	85.93	73^rd	665	89.0%
2021	81.55	105^th	639	83.6%
2022	83.91	88^th	658	86.6%
2023	70.85	154^th	656	76.5%
2024	70.71	162^nd	664	75.6%

See the entire list of Best Illinois High Schools for Female Students!

Rank History for Disabled students at Crystal Lake South High School

Year	Avg Standard Score	Statewide Rank	Total # Ranked High Schools	IL State Percentile	SchoolDigger Rating
2023	75.81	54^th	428	87.4%
2024	86.44	43^rd	429	90.0%

See the entire list of Best Illinois High Schools for Disabled Students!

Rank History for Male students at Crystal Lake South High School

Year	Avg Standard Score	Statewide Rank	Total # Ranked High Schools	IL State Percentile
2018	84.77	71^st	619	88.5%
2019	80.52	102^nd	675	84.9%
2021	72.88	137^th	653	79.0%
2022	79.68	105^th	664	84.2%
2023	67.08	172^nd	668	74.3%
2024	79.66	106^th	668	84.1%

See the entire list of Best Illinois High Schools for Male Students!

Rank History for Asian students at Crystal Lake South High School

Year	Avg Standard Score	Statewide Rank	Total # Ranked High Schools	IL State Percentile
2021	43.01	84^th	135	37.8%
2022	13.76	124^th	141	12.1%
2023	83.77	17^th	134	87.3%
2024	45.59	78^th	137	43.1%

See the entire list of Best Illinois High Schools for Asian Students!

Rank History for African American students at Crystal Lake South High School

Year	Avg Standard Score	Statewide Rank	Total # Ranked High Schools	IL State Percentile
2021	77.14	33^rd	281	88.3%
2023	76.34	38^th	301	87.4%
2024	64.52	58^th	299	80.6%

See the entire list of Best Illinois High Schools for African American Students!

Rank History for Hispanic students at Crystal Lake South High School

Year	Avg Standard Score	Statewide Rank	Total # Ranked High Schools	IL State Percentile
2018	62.69	73^rd	291	74.9%
2019	44.80	149^th	317	53.0%
2021	68.11	65^th	317	79.5%
2022	71.16	66^th	335	80.3%
2023	60.64	97^th	333	70.9%
2024	46.42	151^st	336	55.1%

See the entire list of Best Illinois High Schools for Hispanic Students!

Rank History for White students at Crystal Lake South High School

Year	Avg Standard Score	Statewide Rank	Total # Ranked High Schools	IL State Percentile
2018	75.02	117^th	548	78.6%
2019	78.18	99^th	552	82.1%
2021	71.19	128^th	553	76.9%
2022	73.94	117^th	560	79.1%
2023	54.28	219^th	557	60.7%
2024	73.33	119^th	554	78.5%

See the entire list of Best Illinois High Schools for White Students!

Data source: test scores: Illinois State Board of Education, rankings: SchoolDigger.com

As you review the school rankings data, please be aware that some of the information from certain demographics is missing. The reason for this omission is that the data has been redacted from the source data itself due to low population samples in these specific demographic groups.

Redacting data from low population samples is a necessary step to ensure the reliability and accuracy of the results, as small sample sizes may not be representative of the broader population. Additionally, this measure helps protect the privacy of individuals belonging to these demographic groups.

Data source: Illinois State Board of Education

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Enrollment information for Crystal Lake South High School

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Year	White	African American	Asian	Hispanic	American Indian	Pacific Islander	Two or More Races	Not Specified	Total
1988	1299	2	20	3	n/a	n/a	n/a	0	1324
1989	1246	2	8	15	n/a	n/a	n/a	0	1271
1990	1157	3	19	23	n/a	n/a	n/a	0	1202
1991	1157	1	17	15	0	n/a	n/a	0	1190
1992	1192	4	20	23	0	n/a	n/a	0	1239
1993	1265	5	25	32	1	n/a	n/a	0	1328
1994	1452	3	19	36	0	n/a	n/a	0	1510
1995	1409	5	30	37	2	n/a	n/a	0	1483
1996	1409	5	30	37	2	n/a	n/a	0	1483
1997	1352	3	33	47	3	n/a	n/a	0	1438
1998	1233	4	36	43	3	n/a	n/a	0	1319
1999	1157	4	39	38	5	n/a	n/a	0	1243
2000	1223	7	36	49	2	n/a	n/a	0	1317
2001	1289	9	40	42	4	n/a	n/a	0	1384
2002	1452	7	40	55	1	n/a	n/a	0	1555
2003	1452	7	40	55	1	n/a	n/a	0	1555
2004	1519	13	42	68	2	n/a	n/a	0	1644
2005	1601	12	58	92	5	n/a	n/a	4	1772
2006	1711	13	55	110	6	n/a	n/a	22	1917
2007	1736	10	53	109	6	n/a	n/a	5	1919
2008	1766	9	52	100	7	n/a	n/a	23	1957
2009	1791	12	63	100	4	n/a	n/a	29	1999
2010	1769	15	60	104	4	n/a	n/a	36	1988
2011	1617	21	61	181	4	4	46	0	1934
2012	1595	24	59	172	1	3	36	0	1890
2013	1568	30	59	163	2	3	25	0	1850
2014	1543	25	51	159	1	3	23	0	1805
2015	1509	23	59	146	3	2	17	0	1759
2016	1408	21	45	164	2	1	45	0	1686
2017	1269	14	28	156	2	1	57	0	1527
2018	1212	19	26	153	4	0	48	0	1462
2019	1147	29	31	226	2	0	45	0	1480
2020	1048	33	37	218	4	0	17	0	1357
2021	1062	40	46	253	4	0	5	0	1410
2022	948	46	58	295	4	0	6	0	1357
2023	910	35	54	291	5	0	6	0	1301
2024	879	37	49	311	4	0	11	0	1291

Data source: National Center for Education Statistics, U.S. Dept of Education.

About Enrollment/Ethnicity

For more information about how the Department of Education defines ethnicity, see Defining Race and Ethnicity Data, National Center for Education Statistics

Students eligible for free or discounted lunch at Crystal Lake South High School

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Year	# Students	Full-time Teachers	Student/Teacher ratio	% Free/Discounted Lunch
1988	1324	75.3	17.5	n/a
1989	1271	72.3	17.5	n/a
1990	1202	67.9	17.7	n/a
1991	1190	67.1	17.7	n/a
1992	1239	65.9	18.8	n/a
1993	1328	71.3	18.6	n/a
1994	1510	77.5	19.5	n/a
1995	1483	79.1	18.7	n/a
1996	1483	79.1	18.7	n/a
1997	1438	77.8	18.5	n/a
1998	1319	73.9	17.8	n/a
1999	1243	74.0	16.8	n/a
2000	1317	75.5	17.4	n/a
2001	1384	78.3	17.7	n/a
2002	1555	84.0	18.5	2.3
2003	1555	84.0	18.5	2.3
2004	1644	91.0	18.1	2.3
2005	1772	93.5	19.0	3.2
2006	1917	100.5	19.1	3.2
2007	1919	100.0	19.2	3.2
2008	1957	98.0	20.0	3.5
2009	1999	109.1	18.3	4.8
2010	1988	111.3	17.8	5.6
2011	1934	109.0	17.7	7.8
2012	1890	106.5	17.7	12.8
2013	1850	62.2	29.7	12.2
2014	1805	103.0	17.5	11.9
2015	1759	98.0	17.9	18.8
2016	1686	95.0	17.7	14.8
2017	1527	87.1	17.5	16
2018	1462	82.5	17.7	19
2019	1480	90.1	16.4	23
2020	1357	77.9	17.4	22.5
2021	1410	n/a	n/a	n/a
2022	1357	76.4	17.7	21.1
2023	1301	73.9	17.5	26.7
2024	1291	74.9	17.2	30.6

Data source: National Center for Education Statistics, U.S. Dept of Education.

About Students eligible for discounted/free lunch:

The National School Lunch Program (NSLP) provides low-cost or free meals to students in U.S. public and nonprofit private schools based on household income. Those with incomes below 130% of the poverty line receive free lunch, while those between 130% and 185% qualify for reduced-price lunch. The percentage of students receiving free or reduced-price lunch serves as a marker for poverty, as it reflects the socioeconomic status of families in a given school or district. A higher FRPL rate typically indicates a higher concentration of low-income families, suggesting that the school or district may face additional challenges in providing adequate resources and support for student success.

Student/Teacher Ratio Crystal Lake South High School

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Year	# Students	Full-time Teachers	Student/Teacher ratio	% Free/Discounted Lunch
1988	1324	75.3	17.5	n/a
1989	1271	72.3	17.5	n/a
1990	1202	67.9	17.7	n/a
1991	1190	67.1	17.7	n/a
1992	1239	65.9	18.8	n/a
1993	1328	71.3	18.6	n/a
1994	1510	77.5	19.5	n/a
1995	1483	79.1	18.7	n/a
1996	1483	79.1	18.7	n/a
1997	1438	77.8	18.5	n/a
1998	1319	73.9	17.8	n/a
1999	1243	74.0	16.8	n/a
2000	1317	75.5	17.4	n/a
2001	1384	78.3	17.7	n/a
2002	1555	84.0	18.5	2.3
2003	1555	84.0	18.5	2.3
2004	1644	91.0	18.1	2.3
2005	1772	93.5	19.0	3.2
2006	1917	100.5	19.1	3.2
2007	1919	100.0	19.2	3.2
2008	1957	98.0	20.0	3.5
2009	1999	109.1	18.3	4.8
2010	1988	111.3	17.8	5.6
2011	1934	109.0	17.7	7.8
2012	1890	106.5	17.7	12.8
2013	1850	62.2	29.7	12.2
2014	1805	103.0	17.5	11.9
2015	1759	98.0	17.9	18.8
2016	1686	95.0	17.7	14.8
2017	1527	87.1	17.5	16
2018	1462	82.5	17.7	19
2019	1480	90.1	16.4	23
2020	1357	77.9	17.4	22.5
2021	1410	n/a	n/a	n/a
2022	1357	76.4	17.7	21.1
2023	1301	73.9	17.5	26.7
2024	1291	74.9	17.2	30.6

Data source: National Center for Education Statistics, U.S. Dept of Education.

About Student-Teacher Ratio

Student/teacher ratio is calculated by dividing the total number of students by the total number of full-time equivalent teachers. Please note that a smaller student/teacher ratio does not necessarily translate to smaller class size. In some instances, schools hire teachers part time, and some teachers are hired for specialized instruction with very small class sizes. These and other factors contribute to the student/teacher ratio. Note: For private schools, Student/teacher ratio may not include Pre-Kindergarten.

Immunization Rates