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

Overview

Academics and Faculty:

# Teachers

578 Teachers

6,299 Teachers

Average Student-Teacher Ratio

8:1

11:1

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Student-Teacher Ratio Trends (2015-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	8:1	11:1	11:1
2024	8:1	12:1	11:1
2023	9:1	12:1	11:1
2022	8:1	12:1	11:1
2021	9:1	12:1	11:1
2020	9:1	12:1	12:1
2019	10:1	12:1	12:1
2018	10:1	12:1	12:1
2017	10:1	12:1	12:1
2016	10:1	12:1	12:1
2015	11:1	12:1	12:1

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% Average Faculty w/Advanced Degree

52%

57%

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Percentage of Faculty With Advanced Degrees Trends (2015-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	52%	56%	55%
2024	54%	57%	54%
2023	57%	57%	54%
2022	55%	56%	54%
2021	61%	56%	54%
2020	65%	56%	54%
2019	65%	57%	53%
2018	68%	57%	53%
2017	62%	53%	53%
2016	65%	51%	52%
2015	67%	50%	52%

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Average Class Size

14 students

15 students

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Class Size Trends (2015-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	14	15	15
2024	13	15	15
2023	13	15	15
2022	14	15	15
2021	14	15	15
2020	14	15	15
2019	14	15	15
2018	13	15	15
2017	13	15	15
2016	13	15	15
2015	12	15	15

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Average Number of AP Courses

15 courses

12 courses

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

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Average SAT score

1385

(Out of 1600)

1258

View Data

SAT Score Trends (2017-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	1218	1245	1233
2024	1218	1242	1230
2023	1050	1235	1228
2022	1095	1243	1229
2021	1095	1251	1229
2020	1280	1283	1226
2019	1280	1274	1226
2018	1280	1229	1226
2017	1280	1262	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	26	25
2019	27	25	25
2018	27	25	25
2017	27	25	25
2016	27	24	25
2015	27	24	25

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Tuition and Acceptance Rate:

Average Yearly Tuition Cost

$18,311

$14,768

View Data

Tuition Cost Trends (2015-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	$18,062	$14,827	$15,012
2024	$16,781	$13,632	$13,254
2023	$15,379	$12,981	$12,626
2022	$15,286	$12,703	$12,187
2021	$14,519	$12,363	$11,800
2020	$14,505	$11,771	$11,512
2019	$14,008	$11,296	$11,293
2018	$13,602	$11,384	$11,017
2017	$12,721	$10,593	$10,708
2016	$12,954	$10,223	$10,356
2015	$13,025	$9,876	$9,939

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Average Summer Program Cost

$1,438

$1,578

View Data

Summer Program Cost Trends (2020-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	$1,625	$1,689	$1,152
2024	$1,521	$1,574	$1,128
2023	$988	$741	$1,156
2022	$988	$853	$1,102
2021	$738	$782	$1,125
2020	$650	$816	$1,217

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Average % on Financial Aid

22%

29%

View Data

Percent on Financial Aid Trends (2015-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	22%	29%	34%
2024	21%	28%	34%
2023	23%	28%	34%
2022	23%	28%	33%
2021	21%	28%	33%
2020	22%	29%	32%
2019	22%	29%	31%
2018	22%	29%	30%
2017	20%	29%	30%
2016	23%	29%	29%
2015	20%	28%	28%

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Average Financial Aid Grant

$4,655

$6,463

View Data

Financial Aid Grant Trends (2015-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	$4,728	$6,269	$7,073
2024	$3,832	$5,056	$6,930
2023	$3,832	$4,967	$6,469
2022	$3,832	$4,768	$6,289
2021	$3,365	$4,639	$6,055
2020	$2,188	$4,407	$5,921
2019	$2,188	$3,978	$5,795
2018	$2,563	$3,894	$5,456
2017	$2,625	$3,205	$5,319
2016	$4,029	$3,355	$5,105
2015	$3,775	$3,170	$5,030

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Average Acceptance Rate

80%

84%

View Data

Acceptance Rate Trends (2015-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	80%	84%	81%
2024	93%	91%	85%
2023	91%	91%	85%
2022	92%	90%	85%
2021	93%	90%	85%
2020	92%	90%	85%
2019	93%	91%	85%
2018	92%	90%	85%
2017	93%	91%	85%
2016	89%	91%	85%
2015	93%	92%	85%

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Average Endowment Size

$7 million

$32.54 million

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Endowment Trends (2020-2025)
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	$6 M	$31 M	$39 M
2024	$4 M	$25 M	$39 M
2023	$4 M	$21 M	$39 M
2022	$4 M	$21 M	$40 M
2021	$4 M	$21 M	$40 M
2020	$4 M	$19 M	$40 M

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Students by Ethnicity:

0.59

0.62

View Data

Diversity Score Trends
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	0.59	0.63	0.65
2024	0.59	0.63	0.65
2023	0.60	0.62	0.65
2022	0.58	0.62	0.64
2021	0.58	0.63	0.64
2020	0.58	0.63	0.64
2019	0.57	0.62	0.63
2018	0.57	0.62	0.63
2017	0.55	0.62	0.61
2016	0.54	0.62	0.61
2015	0.55	0.62	0.61

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# American Indian Students

14 Students

404 Students

% American Indian Students

n/a

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

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# Asian Students

98 Students

1,604 Students

% Asian Students

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Asian Student Percentage Trends
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	2%	2%	5%
2024	3%	2%	5%
2023	2%	2%	5%
2022	3%	3%	4%
2021	3%	3%	4%
2020	3%	3%	4%
2019	2%	2%	4%
2018	3%	3%	4%
2017	2%	2%	4%
2016	2%	2%	4%
2015	1%	2%	4%

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# Hispanic Students

252 Students

5,866 Students

% Hispanic Students

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Hispanic Student Percentage Trends
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	5%	9%	9%
2024	5%	9%	9%
2023	6%	8%	9%
2022	6%	9%	8%
2021	6%	9%	9%
2020	6%	9%	9%
2019	5%	9%	8%
2018	5%	8%	8%
2017	4%	8%	8%
2016	4%	8%	8%
2015	3%	8%	8%

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# Black Students

141 Students

1,900 Students

% Black Students

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Black Student Percentage Trends
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	3%	3%	7%
2024	3%	3%	7%
2023	3%	3%	8%
2022	1%	2%	7%
2021	1%	2%	7%
2020	1%	3%	8%
2019	1%	3%	7%
2018	1%	2%	7%
2017	1%	3%	7%
2016	1%	3%	7%
2015	1%	3%	8%

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# White Students

2,493 Students

33,658 Students

% White Students

53%

48%

View Data

White Student Percentage Trends
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	52%	48%	52%
2024	52%	48%	52%
2023	51%	48%	52%
2022	54%	47%	54%
2021	54%	47%	54%
2020	54%	47%	54%
2019	54%	48%	56%
2018	53%	45%	56%
2017	56%	46%	58%
2016	58%	46%	58%
2015	56%	50%	58%

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# Hawaiian Students

n/a

65 Students

% Hawaiian Students

n/a

# Two or more races Students

n/a

% of Two or more races Students

n/a

# Others Students

1,745 Students

26,059 Students

% of Others Students

37%

38%

View Data

Other Races Student Percentage Trends
Year	Boulder County Average	Colorado (CO) Average	National Average
2025	38%	37%	26%
2024	37%	37%	26%
2023	38%	38%	25%
2022	36%	39%	25%
2021	36%	39%	25%
2020	36%	38%	24%
2019	38%	38%	24%
2018	38%	42%	23%
2017	36%	40%	22%
2016	34%	40%	22%
2015	38%	36%	21%

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All Ethnic Groups

Extracurriculars and Sports:

Average Number of Extracurriculars

6 extracurriculars

7 extracurriculars

Average Number of Sports

4 sports

6 sports

Frequently Asked Questions

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

The private schools in Boulder County, CO include Mackintosh Academy Boulder, Boulder Country Day, and Dawson School.

How many private schools are located in Boulderunty?

48 private schools are located in Boulderunty.

How much do private schools cost in Boulderunty?

The average tuition cost is $18,311, which is higher than the Colorado private school average tuition cost of $14,768.

How diverse are private schools in Boulderunty?

Boulderunty private schools are approximately 22% minority students, which is lower than the Colorado private school average of 25%.

What percentage of students in Boulderunty go to private school?

10% of all K-12 students in Boulderunty are educated in private schools (compared to the CO state average of 8%).

What percentage of private schools are religiously affiliated in Boulderunty?

23% of private schools in Boulderunty are religiously affiliated (most commonly Christian and Catholic).

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

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Year	Boulder County Average	Colorado (CO) Average	National Average
2025	102	160	179
2024	96	153	172
2023	110	155	174
2022	108	155	185
2021	108	153	180
2020	106	148	171
2019	111	148	175
2018	107	157	172
2017	106	158	180
2016	102	157	178
2015	106	138	167

Quick Facts (2026-27)

Quick Facts (2026-27)

Top Ranked Boulder County Private Schools (2026-27)

Boulder County Private Schools (Closed)

Overview

Trends in Total Number of Private Schools

Trends in the Average Number of Students Per Private 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)

Summer Program Cost Trends (2020-2025)

Percent on Financial Aid Trends (2015-2025)

Financial Aid Grant Trends (2015-2025)

Acceptance Rate Trends (2015-2025)

Endowment Trends (2020-2025)

Students by Ethnicity:

Diversity Score Trends

Percentage of Private 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

Filter Schools

Quick Links

Most Popular Articles

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Best Boulder County Private Schools (2026-27)

Top Ranked Boulder County Private Schools (2026-27)

Boulder County Private Schools (Closed)

Overview

Trends in Total Number of Private Schools

Trends in the Average Number of Students Per Private 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)

Summer Program Cost Trends (2020-2025)

Percent on Financial Aid Trends (2015-2025)

Financial Aid Grant Trends (2015-2025)

Acceptance Rate Trends (2015-2025)

Endowment Trends (2020-2025)

Students by Ethnicity:

Diversity Score Trends

Percentage of Private 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