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Crystal Lake South High School

Q: Is Crystal Lake South High School a good school?

Crystal Lake South High School ranks 118 th of 698 Illinois high schools. SchoolDigger rates this school 4 stars out of 5.

Public Grades 9-12

118^th

SchoolDigger Rank ?

of 698 Illinois High Schools

Better than 83% of Illinois high schools

Summary

Crystal Lake South High School is a public high school serving 1,291 students in grades 9-12 in Crystal Lake, Illinois. The school is part of the Community High School District 155, which is ranked 114 out of 811 districts in the state and has a 4-star rating.

Crystal Lake South High School consistently ranks among the top high schools in Illinois, with strong academic performance on standardized tests like the ACT and PreACT Secure. The school particularly excels for certain student subgroups, ranking 25th out of 323 Illinois high schools for African American students and 75th out of 491 for students with disabilities. However, the school's performance for English Language Learners is relatively weaker. Crystal Lake South High School also maintains high graduation rates around 90% and low dropout rates, though chronic absenteeism is an area of concern.

Compared to nearby schools, Crystal Lake South High School performs well, outpacing Huntley High School in the neighboring district, though it trails Cary-Grove Community High School and Prairie Ridge High School within its own district. In contrast, Dundee-Crown High School in the Cusd 300 district has significantly lower academic performance across various metrics.

1,279

Students ?

16.4

Student/teacher ratio ?

$21,343

Per pupil spending ?

32.1%

Free/discounted lunch ?

1200 S McHenry Ave
Crystal Lake, IL 60014-7495

(815) 455-3860

District: Chsd 155

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

Racial breakdown:

White:

64.9%

Hispanic:

25.7%

Asian:

4.3%

See top rated Illinois high schools

Compare Crystal Lake South High School to nearby high schools!

At a glance

▲ Ranking trend: Improving — 34th percentile in 2015 → 83rd in 2025

Strengths

✓Test scores above the Illinois average (57% vs 48% meeting standards)

✓Ranks in the top 17% of Illinois high schools

✓93% graduate in 4 years — above the Illinois average (89%)

Worth a look

!Some student groups rank well below the school's overall statewide standing

!Near the bottom of Chsd 155's ranking

Students meeting standards (2024-2025) ?

This school57%

District avg60%

Illinois avg48%

118^th of 698

Illinois public high schools ?

Top 17%▲ up 49 pts since 2015

From bottom 34% (2015) to top 17% (2025)

See the entire ranking list of Illinois High Schools →

★★★★★

SchoolDigger rating ?

3^rd of 4High Schools in the Chsd 155

114^th of 811Chsd 155 among Illinois districts

Statewide rank percentile over time (100 = the top-ranked school in the state; click a legend item to add a student group)

Show full rank history (all student groups)

All Students

Year	Avg score	Statewide rank	Illinois percentile	Rating
2025	78.6	118 of 698	83.1%	★★★★☆
2024	77.4	128 of 697	81.6%	★★★★☆
2023	70.7	160 of 699	77.1%	★★★★☆
2022	83.5	95 of 699	86.4%	★★★★☆
2021	79.7	115 of 688	83.3%	★★★★☆
2019	84.9	87 of 701	87.6%	★★★★☆
2018	82.6	93 of 647	85.6%	★★★★☆
2017	77.9	112 of 642	82.6%	★★★★☆
2016	42.0	374 of 643	41.8%	★★☆☆☆
2015	32.7	404 of 614	34.2%	★★☆☆☆
2014	82.2	114 of 670	83.0%	★★★★☆
2013	83.9	93 of 670	86.1%	★★★★☆
2012	83.2	90 of 665	86.5%	★★★★☆
2011	80.1	108 of 655	83.5%	★★★★☆
2010	79.3	114 of 643	82.3%	★★★★☆
2009	80.0	104 of 632	83.5%	★★★★☆
2008	81.0	101 of 624	83.8%	★★★★☆
2007	79.8	108 of 612	82.4%	★★★★☆
2006	84.5	69 of 596	88.4%	★★★★☆
2005	77.8	104 of 590	82.4%	★★★★☆
2004	77.3	108 of 592	81.8%	★★★★☆
2003	84.3	59 of 586	89.9%	★★★★★

African American

Year	Avg score	Statewide rank	Illinois percentile	Rating
2025	87.0	25 of 323	92.3%	★★★★★
2024	64.5	58 of 299	80.6%	★★★★☆
2023	76.3	38 of 301	87.4%	★★★★☆
2021	77.1	33 of 281	88.3%	★★★★☆

Asian

Year	Avg score	Statewide rank	Illinois percentile	Rating
2025	52.4	79 of 148	46.6%	★★☆☆☆
2024	45.6	78 of 137	43.1%	★★☆☆☆
2023	83.8	17 of 134	87.3%	★★★★☆
2022	13.8	124 of 141	12.1%	★☆☆☆☆
2021	43.0	84 of 135	37.8%	★★☆☆☆

Disabled

Year	Avg score	Statewide rank	Illinois percentile	Rating
2025	70.4	75 of 491	84.7%	★★★★☆
2024	86.4	43 of 429	90.0%	★★★★★
2023	75.8	54 of 428	87.4%	★★★★☆

English Language Learner

Year	Avg score	Statewide rank	Illinois percentile	Rating
2025	31.1	209 of 284	26.4%	★☆☆☆☆
2024	76.6	28 of 248	88.7%	★★★★☆
2023	31.0	159 of 217	26.7%	★☆☆☆☆
2022	94.4	5 of 205	97.6%	★★★★★

Female

Year	Avg score	Statewide rank	Illinois percentile	Rating
2025	73.1	147 of 685	78.5%	★★★★☆
2024	70.7	162 of 664	75.6%	★★★★☆
2023	70.9	154 of 656	76.5%	★★★★☆
2022	83.9	88 of 658	86.6%	★★★★☆
2021	81.6	105 of 639	83.6%	★★★★☆
2019	85.9	73 of 665	89.0%	★★★★☆
2018	76.6	126 of 620	79.7%	★★★★☆

Hispanic

Year	Avg score	Statewide rank	Illinois percentile	Rating
2025	55.2	144 of 366	60.7%	★★★☆☆
2024	46.4	151 of 336	55.1%	★★★☆☆
2023	60.6	97 of 333	70.9%	★★★★☆
2022	71.2	66 of 335	80.3%	★★★★☆
2021	68.1	65 of 317	79.5%	★★★★☆
2019	44.8	149 of 317	53.0%	★★★☆☆
2018	62.7	73 of 291	74.9%	★★★★☆

Low Socio Economic Status

Year	Avg score	Statewide rank	Illinois percentile	Rating
2025	73.5	116 of 672	82.7%	★★★★☆
2024	88.6	52 of 639	91.9%	★★★★★
2023	59.5	213 of 644	66.9%	★★★☆☆
2022	78.2	71 of 626	88.7%	★★★★☆
2021	88.8	49 of 611	92.0%	★★★★★
2019	83.3	53 of 639	91.7%	★★★★★
2018	77.8	71 of 585	87.9%	★★★★☆

Male

Year	Avg score	Statewide rank	Illinois percentile	Rating
2025	80.1	104 of 685	84.8%	★★★★☆
2024	79.7	106 of 668	84.1%	★★★★☆
2023	67.1	172 of 668	74.3%	★★★★☆
2022	79.7	105 of 664	84.2%	★★★★☆
2021	72.9	137 of 653	79.0%	★★★★☆
2019	80.5	102 of 675	84.9%	★★★★☆
2018	84.8	71 of 619	88.5%	★★★★☆

Multi-racial

Year	Avg score	Statewide rank	Illinois percentile	Rating
2019	81.9	28 of 165	83.0%	★★★★☆
2018	82.4	27 of 154	82.5%	★★★★☆

Special Education

Year	Avg score	Statewide rank	Illinois percentile	Rating
2025	79.3	78 of 527	85.2%	★★★★☆
2024	86.7	59 of 482	87.8%	★★★★☆
2023	73.7	87 of 476	81.7%	★★★★☆
2022	69.0	60 of 493	87.8%	★★★★☆
2021	86.7	27 of 453	94.0%	★★★★★
2019	76.9	50 of 473	89.4%	★★★★☆
2018	33.3	222 of 374	40.6%	★★☆☆☆

White

Year	Avg score	Statewide rank	Illinois percentile	Rating
2025	76.0	108 of 564	80.9%	★★★★☆
2024	73.3	119 of 554	78.5%	★★★★☆
2023	54.3	219 of 557	60.7%	★★★☆☆
2022	73.9	117 of 560	79.1%	★★★★☆
2021	71.2	128 of 553	76.9%	★★★★☆
2019	78.2	99 of 552	82.1%	★★★★☆
2018	75.0	117 of 548	78.6%	★★★★☆

How student groups rank statewide ? (each group's percentile vs the same group at other schools — higher is better; the +/- beside each compares the group with this school's overall percentile)

African American (2025)92nd percentile+9 vs school

Special Education (2025)85th percentile~ school

Male (2025)85th percentile~ school

Disabled (2025)85th percentile~ school

Multi-racial (2019)83rd percentile-5 vs school

Low Socio Economic Status (2025)83rd percentile~ school

White (2025)81st percentile~ school

Female (2025)79th percentile-5 vs school

Hispanic (2025)61st percentile-22 vs school

Asian (2025)47th percentile-36 vs school

English Language Learner (2025)26th percentile-57 vs school

By subject vs Illinois (2024-2025) ?

English Language Arts62%+10 vs state

Science57%+9 vs state

Mathematics42%~ state avg

★

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Schools Near Crystal Lake South High School

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Ranking:

E Elementary M Middle H High A Alternative P Private

Choose columns to see: Summary School Students/Teachers Ranking Test Scores Immunizations Finance All

School													Students/Teachers											Ranking (2025)				Ranking (2024)				PreACT Secure English Language Arts (2025)		PreACT Secure Mathematics (2025)		PreACT Secure Science (2025)		ACT English Language Arts (2025)	ACT Mathematics (2025)	ACT Science (2025)	% Polio (2024)	% Measles (2024)	% Mumps (2024)	% Rubella (2024)	% Hepatitis B (2024)	% Varicella (2024)	% DTP (2024)	% Meningococcal (2024)	Per Pupil Expenditures (2025)
Name	Type	Grades	Address	City	Zip	County	District	Is Charter	Is Magnet	Is Virtual	Is Title I	Phone	Enrollment	Full-time Teachers	Student/ Teacher Ratio	Free/Discounted Lunch Recipients	White	Black	Hispanic	Asian	American Indian	Pacific Islander	Two or More Races	Average Standard Score (2025)	Statewide Rank (2025)	State Percentile (2025)	SchoolDigger Rating (2025)	Average Standard Score (2024)	Statewide Rank (2024)	State Percentile (2024)	Rank Change from Previous Year	PreACT Secure English Language Arts 9th Grade	PreACT Secure English Language Arts 10th Grade	PreACT Secure Mathematics 9th Grade	PreACT Secure Mathematics 10th Grade	PreACT Secure Science 9th Grade	PreACT Secure Science 10th Grade	ACT English Language Arts 11th Grade	ACT Mathematics 11th Grade	ACT Science 11th Grade	% Polio All Grades	% Measles All Grades	% Mumps All Grades	% Rubella All Grades	% Hepatitis B All Grades	% Varicella All Grades	% DTP All Grades	% Meningococcal All Grades	Per Pupil Expenditures Total	Sub-total from Federal Funds	Sub-total from State/Local Funds
Crystal Lake South High School	Public	9-12	1200 S McHenry Ave	Crystal Lake	60014	McHenry County	Chsd 155	No	(n/a)	No	Yes	(815) 455-3860	1,279	78	16.4	32.1%	830 (64.9%)	35 (2.7%)	329 (25.7%)	55 (4.3%)	4 (0.3%)	0 (0.0%)	26 (2.0%)	78.6	118^th of 698 public high schools	83.1%		77.4	128^th of 697 public high schools	81.6%	10	74.1	68.4	36.9	38.8	65.5	66.6	61.6	41.8	57.3	98.3	98.5	98.5	98.5	98.5	98.5	98.5	98.2	$21,343	$381	$20,962
Haber Oaks Campus	Public	9-12	1200 S Mchenry Ave	Crystal Lake	60014	McHenry County	Chsd 155	No	(n/a)	No	(n/a)	(815) 893-5300	0	10	.0		0 ()	0 ()	0 ()	0 ()	0 ()	0 ()	0 ()								(n/a)										99.0	100.0	100.0	100.0	100.0	100.0	100.0	89.1
Crystal Lake Central High School	Public	9-12	45 W Franklin Ave	Crystal Lake	60014	McHenry County	Chsd 155	No	(n/a)	No	Yes	(815) 459-2505	1,443	85	16.9	35.3%	926 (64.2%)	28 (1.9%)	403 (27.9%)	42 (2.9%)	3 (0.2%)	2 (0.1%)	39 (2.7%)	75.9	136^th of 698 public high schools	80.5%		79	116^th of 697 public high schools	83.4%	20	71.6	68.8	35.0	42.9	57.1	64.4	60.2	42.1	52.7	97.0	97.1	97.0	97.1	97.2	96.5	97.1	95.8	$20,307	$390	$19,916
Harry D Jacobs High School	Public	9-12	2601 Bunker Hill Dr	Algonquin	60102	McHenry County	Cusd 300	No	(n/a)	No	No	(847) 532-6100	2,056	141	14.6	40.3%	1,163 (56.6%)	90 (4.4%)	536 (26.1%)	162 (7.9%)	6 (0.3%)	4 (0.2%)	93 (4.5%)	72.9	155^th of 698 public high schools	77.8%		66.3	184^th of 697 public high schools	73.6%	29	68.6	65.2	35.5	39.2	53.4	56.6	61.5	40.4	56.3	98.7	98.6	98.6	98.6	98.8	98.4	98.7	97.8	$17,663	$422	$17,241
Prairie Ridge High School	Public	9-12	6000 Dvorak Dr	Crystal Lake	60012	McHenry County	Chsd 155	No	(n/a)	No	No	(815) 479-0404	1,133	69	16.3	22.4%	901 (79.5%)	14 (1.2%)	151 (13.3%)	35 (3.1%)	1 (0.1%)	0 (0.0%)	31 (2.7%)	88.3	63^rd of 698 public high schools	91.0%		89.4	73^rd of 697 public high schools	89.5%	10	78.4	72.2	44.6	51.7	62.1	66.0	75.8	58.6	72.1	97.8	97.8	97.8	97.8	97.7	97.7	97.9	97.3	$21,803	$305	$21,497
Cary-Grove Community High School	Public	9-12	2208 3 Oaks Rd	Cary	60013	McHenry County	Chsd 155	No	(n/a)	No	No	(847) 639-3825	1,348	76	17.6	25.6%	984 (73.0%)	22 (1.6%)	267 (19.8%)	24 (1.8%)	4 (0.3%)	4 (0.3%)	43 (3.2%)	86.4	77^th of 698 public high schools	89.0%		89.7	70^th of 697 public high schools	90.0%	7	72.3	73.0	48.2	53.0	60.2	67.6	65.9	57.2	66.0	98.3	98.4	98.3	98.4	98.4	98.0	98.4	97.9	$21,133	$341	$20,792
Dundee-Crown High School	Public	9-12	1500 Kings Rd	Carpentersville	60110	Kane County	Cusd 300	No	(n/a)	No	Yes	(224) 484-5000	2,573	166	15.4	71.9%	575 (22.3%)	105 (4.1%)	1,787 (69.5%)	43 (1.7%)	3 (0.1%)	1 (0.0%)	58 (2.3%)	30.3	506^th of 698 public high schools	27.5%		38.5	403^rd of 697 public high schools	42.2%	103	44.2	39.5	18.0	18.6	31.1	34.2	37.7	22.8	34.6	97.9	98.1	98.1	98.1	100.0	98.1	98.1	93.6	$16,676	$452	$16,224
Success Academy High School	Public	9-12	1500 Kings Rd	Carpentersville	60110	Kane County	Kane ROE	No	(n/a)	No	(n/a)	(847) 484-5000	0	0			0 ()	0 ()	0 ()	0 ()	0 ()	0 ()	0 ()								(n/a)
Huntley High School	Public	9-12	13719 Harmony Rd	Huntley	60142	McHenry County	Huntley Community School District 158	No	(n/a)	No	Yes	(847) 659-6600	2,804	179	15.6	19.3%	1,999 (71.3%)	88 (3.1%)	363 (12.9%)	206 (7.3%)	17 (0.6%)	2 (0.1%)	120 (4.3%)	88.4	62^nd of 698 public high schools	91.1%		85.4	87^th of 697 public high schools	87.5%	25	80.2	70.4	54.2	46.2	65.7	65.3	68.2	56.5	70.3	98.5	98.5	98.5	98.5	98.7	98.5	98.6	98.0	$16,086	$335	$15,751
Oak Ridge RSSP	Public	6-12	300 Cleveland Ave	Carpentersville	60110	Kane County	Kane ROE	No	(n/a)	No	(n/a)	(630) 232-5963	0	0			0 ()	0 ()	0 ()	0 ()	0 ()	0 ()	0 ()								(n/a)

Frequently Asked Questions about Crystal Lake South High School

How many students attend Crystal Lake South High School?

In the 2024-25 school year, 1,279 students attended Crystal Lake South High School.

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

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

Students at Crystal Lake South High School are 65% White, 26% Hispanic, 4% Asian, 3% African American, 2% Two or more races.

Is Crystal Lake South High School a good school?

Crystal Lake South High School ranks 118^th of 698 Illinois high schools. SchoolDigger rates this school 4 stars out of 5.

What district is Crystal Lake South High School in?

Chsd 155

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Latest Illinois data All new data »

2024–25 school spending dataOct 30, 2025

2024–25 attendance data, dropout rates & graduation ratesOct 30, 2025

2024–25 ACT, IAR, ISA & PreACT Secure test scoresOct 30, 2025

2023–24 school spending dataOct 30, 2024

SchoolDigger data sources: National Center for Education Statistics, U.S. Department of Education, the U.S. Census Bureau, the Illinois Department of Public Health and the Illinois State Board of Education.

IMPORTANT DISCLAIMERS: Not all boundaries are included. We make every effort to ensure that boundaries are up-to-date. But it's important to note that these are approximations and are for general informational purposes only. To verify legal descriptions of boundaries or school locations, contact your local tax assessor's office and/or school district.