[+] Show Closed Private Schools in Boulder County, Colorado

Overview

Academics and Faculty:

# Teachers

205 Teachers

3,039 Teachers

Average Student-Teacher Ratio

5:1

9:1

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Student-Teacher Ratio Trends (2015-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	6:1	10:1	10:1
2024	6:1	10:1	10:1
2023	6:1	10:1	10:1
2022	7:1	10:1	10:1
2021	7:1	10:1	10:1
2020	8:1	10:1	10:1
2019	8:1	10:1	10:1
2018	8:1	10:1	10:1
2017	8:1	10:1	10:1
2016	8:1	10:1	10:1
2015	8:1	10:1	10:1

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% Average Faculty w/Advanced Degree

58%

56%

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Percentage of Faculty With Advanced Degrees Trends (2015-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	51%	55%	57%
2024	56%	56%	57%
2023	57%	57%	57%
2022	52%	57%	56%
2021	60%	57%	56%
2020	73%	59%	56%
2019	76%	59%	55%
2018	82%	59%	55%
2017	72%	57%	55%
2016	73%	54%	54%
2015	73%	49%	54%

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Average Class Size

9 students

13 students

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Class Size Trends (2015-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	9	13	14
2024	9	13	14
2023	9	13	14
2022	9	13	14
2021	10	14	14
2020	10	14	14
2019	10	14	14
2018	10	14	14
2017	10	14	14
2016	10	14	14
2015	12	13	14

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Average Number of AP Courses

15 courses

13 courses

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Trends in Average Number of AP Courses Offered
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	16	13	13
2024	16	13	12
2023	16	13	12
2022	16	13	12
2021	16	13	12
2020	16	12	12
2019	13	12	11
2018	13	12	11
2017	13	11	11
2016	13	11	11
2015	13	9	10

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Average SAT score

1385

(Out of 1600)

1267

View Data

SAT Score Trends (2017-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	1218	1254	1233
2024	1218	1251	1231
2023	1050	1243	1229
2022	1095	1253	1230
2021	1095	1262	1230
2020	1280	1300	1227
2019	1280	1289	1226
2018	1280	1238	1226
2017	1280	1238	1233

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Average ACT score

(Out of 36)

View Data

ACT Score Trends (2015-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	31	25	26
2024	31	25	26
2020	27	25	26
2019	27	25	25
2018	27	25	25
2017	27	24	25
2016	27	24	25
2015	27	23	25

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Tuition and Acceptance Rate:

Average Yearly Tuition Cost

$24,070

$16,797

View Data

Tuition Cost Trends (2015-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	$22,049	$16,723	$17,997
2024	$20,145	$16,552	$17,011
2023	$18,741	$15,994	$16,191
2022	$18,790	$15,903	$15,821
2021	$17,761	$15,623	$15,331
2020	$18,634	$15,191	$15,046
2019	$17,870	$14,387	$14,791
2018	$19,109	$14,513	$14,527
2017	$19,563	$13,525	$14,161
2016	$16,963	$12,322	$13,713
2015	$16,513	$11,546	$13,065

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Average Summer Program Cost

$975

Average % on Financial Aid

31%

34%

View Data

Percent on Financial Aid Trends (2015-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	31%	33%	38%
2024	31%	32%	37%
2023	31%	32%	36%
2022	31%	32%	36%
2021	27%	33%	36%
2020	30%	34%	35%
2019	30%	34%	34%
2018	27%	33%	33%
2017	26%	32%	32%
2016	27%	33%	31%
2015	23%	33%	30%

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Average Financial Aid Grant

$8,163

$9,150

View Data

Financial Aid Grant Trends (2015-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	$8,163	$8,504	$9,714
2024	$6,330	$6,512	$9,498
2023	$6,330	$6,202	$8,890
2022	$6,330	$5,942	$8,717
2021	$5,913	$6,242	$8,472
2020	$3,750	$6,249	$8,370
2019	$3,750	$6,113	$7,924
2018	$3,750	$5,930	$7,471
2017	$3,750	$5,100	$7,202
2016	$6,250	$5,076	$6,993
2015	$6,250	$4,949	$6,822

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Average Acceptance Rate

62%

83%

View Data

Acceptance Rate Trends (2015-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	62%	82%	79%
2024	80%	86%	81%
2023	80%	87%	81%
2022	80%	88%	81%
2021	84%	88%	81%
2020	84%	89%	81%
2019	84%	90%	81%
2018	89%	91%	80%
2017	92%	92%	81%
2016	88%	91%	80%
2015	88%	90%	81%

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Average Endowment Size

$4 million

$29.03 million

Students by Ethnicity:

0.25

0.57

View Data

Diversity Score Trends
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	0.26	0.58	0.61
2024	0.24	0.57	0.60
2023	0.31	0.56	0.60
2022	0.42	0.57	0.58
2021	0.40	0.57	0.57
2020	0.39	0.57	0.57
2019	0.37	0.56	0.56
2018	0.36	0.58	0.55
2017	0.40	0.56	0.54
2016	0.40	0.56	0.54
2015	0.42	0.55	0.53

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# American Indian Students

4 Students

259 Students

% American Indian Students

n/a

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Percentage of Private High School Students of American Indian Trends
Year	Boulder County Average	Colorado (CO) Average	National Average
2017	2%	1%	1%
2016	3%	1%	1%
2015	3%	1%	1%

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# Asian Students

54 Students

880 Students

% Asian Students

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Asian Student Percentage Trends
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	4%	3%	5%
2024	5%	3%	6%
2023	5%	3%	6%
2022	4%	3%	5%
2021	5%	3%	5%
2020	4%	3%	5%
2019	4%	3%	5%
2018	4%	3%	5%
2017	2%	3%	4%
2016	2%	3%	4%
2015	2%	3%	4%

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# Hispanic Students

65 Students

2,614 Students

% Hispanic Students

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Hispanic Student Percentage Trends
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	5%	10%	9%
2024	5%	10%	9%
2023	5%	8%	8%
2022	5%	9%	8%
2021	5%	10%	8%
2020	6%	10%	8%
2019	6%	10%	8%
2018	6%	10%	8%
2017	5%	10%	7%
2016	5%	10%	8%
2015	6%	10%	8%

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# Black Students

24 Students

1,069 Students

% Black Students

View Data

Black Student Percentage Trends
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	2%	4%	8%
2024	2%	4%	8%
2023	1%	4%	8%
2022	1%	3%	8%
2021	1%	3%	8%
2020	1%	4%	8%
2019	1%	4%	8%
2018	1%	4%	8%
2017	1%	3%	8%
2016	1%	3%	8%
2015	1%	4%	9%

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# White Students

1,030 Students

17,521 Students

% White Students

86%

62%

View Data

White Student Percentage Trends
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	86%	61%	59%
2024	87%	62%	60%
2023	82%	62%	60%
2022	75%	61%	62%
2021	76%	61%	63%
2020	77%	62%	64%
2019	79%	63%	64%
2018	79%	61%	65%
2017	76%	62%	66%
2016	76%	62%	66%
2015	75%	64%	66%

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# Hawaiian Students

n/a

37 Students

% Hawaiian Students

n/a

# Two or more races Students

n/a

% of Two or more races Students

n/a

# Others Students

15 Students

6,063 Students

% of Others Students

21%

View Data

Other Races Student Percentage Trends
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	3%	21%	17%
2024	1%	20%	15%
2023	7%	21%	16%
2022	15%	22%	16%
2021	13%	22%	15%
2020	12%	20%	14%
2019	10%	19%	14%
2018	10%	21%	13%
2017	14%	21%	14%
2016	13%	21%	13%
2015	13%	18%	12%

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All Ethnic Groups

Extracurriculars and Sports:

Average Number of Extracurriculars

5 extracurriculars

9 extracurriculars

Average Number of Sports

5 sports

8 sports

Frequently Asked Questions

What are the top ranked private high schools in Boulder County, CO?

The private high schools in Boulder County, CO include September School, Dawson School, and Tara Performing Arts High School.

How many private high schools are located in Boulderunty?

10 private high schools are located in Boulderunty.

How diverse are private high schools in Boulderunty?

Boulderunty private high schools are approximately 13% minority students, which is lower than the Colorado private school average of 25%.

What percentage of private high schools are religiously affiliated in Boulderunty?

25% of private high schools in Boulderunty are religiously affiliated (most commonly Other and Church of Christ).

Which private high schools in Boulderunty are often viewed compared to one another?

Popular comparisons of private high schools in Boulderunty include: Transitional School vs. Dawson School, Transitional School vs. Crossroads School

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Quick Facts (2026-27)

Quick Facts (2026-27)

Top Ranked Boulder County Private High Schools (2026-27)

Boulder County Private High Schools (Closed)

Overview

Trends in Total Number of Private High Schools

Trends in the Average Number of Students Per Private High School

Percentage of Students of Color Trends (2015-2025)

Academics and Faculty:

Student-Teacher Ratio Trends (2015-2025)

Percentage of Faculty With Advanced Degrees Trends (2015-2025)

Class Size Trends (2015-2025)

Trends in Average Number of AP Courses Offered

SAT Score Trends (2017-2025)

ACT Score Trends (2015-2025)

Tuition and Acceptance Rate:

Tuition Cost Trends (2015-2025)

Percent on Financial Aid Trends (2015-2025)

Financial Aid Grant Trends (2015-2025)

Acceptance Rate Trends (2015-2025)

Students by Ethnicity:

Diversity Score Trends

Percentage of Private High School Students of American Indian Trends

Asian Student Percentage Trends

Hispanic Student Percentage Trends

Black Student Percentage Trends

White Student Percentage Trends

Other Races Student Percentage Trends

Extracurriculars and Sports:

Frequently Asked Questions

Recent Articles

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Trends in the Average Number of Students Per Private High School
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	98	233	253
2024	93	222	245
2023	115	223	247
2022	133	229	257
2021	132	223	249
2020	122	212	235
2019	126	207	242
2018	115	209	238
2017	120	208	246
2016	107	201	241
2015	104	176	220

Best Boulder County Private High Schools (2026-27)

Top Ranked Boulder County Private High Schools (2026-27)

Boulder County Private High Schools (Closed)

Overview

Trends in Total Number of Private High Schools

Trends in the Average Number of Students Per Private High School

Percentage of Students of Color Trends (2015-2025)

Academics and Faculty:

Student-Teacher Ratio Trends (2015-2025)

Percentage of Faculty With Advanced Degrees Trends (2015-2025)

Class Size Trends (2015-2025)

Trends in Average Number of AP Courses Offered

SAT Score Trends (2017-2025)

ACT Score Trends (2015-2025)

Tuition and Acceptance Rate:

Tuition Cost Trends (2015-2025)

Percent on Financial Aid Trends (2015-2025)

Financial Aid Grant Trends (2015-2025)

Acceptance Rate Trends (2015-2025)

Students by Ethnicity:

Diversity Score Trends

Percentage of Private High School Students of American Indian Trends

Asian Student Percentage Trends

Hispanic Student Percentage Trends

Black Student Percentage Trends

White Student Percentage Trends

Other Races Student Percentage Trends

Extracurriculars and Sports:

Frequently Asked Questions

More Articles