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Oldest Private High Schools in Colorado

The average private high school in Colorado was founded around 1978 (2026-27).
The oldest private high school in Colorado is St. Mary's Academy, founded in 1864.

Quick Facts (2026-27)

  • # CO Schools Ranked: 98
  • Top 20 Range (Year Founded): 1864–1962
  • CO School Avg.: 1977
  • National School Avg.: 1967

Quick Facts (2026-27)

  • # CO Schools Ranked: 98
  • Top 20 Range (Year Founded): 1864–1962
  • CO School Avg.: 1977
  • National School Avg.: 1967
Show school map — Colorado (year founded range: 1864–1962, avg 1977)
Year Founded Range: 1864 1975 Avg. Year Founded: 1945

Oldest Private High Schools in Colorado (2026-27)

Showing 98 schools
St. Mary's Academy Photo
#1 St. Mary's Academy
Gr: NS-12 | 678 students
Avg. class size: 16 students
Sports: 15 | Extracurriculars: 10
Catholic
4545 South University Boulevard
Englewood, CO 80113
(303) 762-8300
(6)
1864year founded
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Regis Jesuit High School Photo
#2Regis Jesuit High School
Gr: 9-12 | 1,630 students
Avg. class size: 21 students
Sports: 21 | Extracurriculars: 3
Specialized Curriculum (Catholic)
6380 S Lewiston Way
Aurora, CO 80016
(303) 269-8000
(1)
1877year founded
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St. Mary's High School Photo
#3St. Mary's High School
Gr: 9-12
Avg. class size: 11 students
Sports: 14 | Extracurriculars: 11
Catholic
2501 E Yampa St
Colorado Springs, CO 80909
(719) 635-7540
(4)
1885year founded
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Map of Pear Park Baptist School
#4Pear Park Baptist School
Gr: PK-12 | 13 students
Avg. class size: 10 students
Baptist
3102 E Rd
Grand Junction, CO 81504
(970) 434-4113
1903year founded
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Colorado Academy Photo
#5Colorado Academy
Gr: PK-12 | 1,043 students
Sports: 19 | Extracurriculars: 24
3800 S Pierce St
Denver, CO 80235
(303) 914-2513
1906year founded
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Campion Academy Photo
#6Campion Academy
Gr: 9-12 | 157 students
Avg. class size: 15 students
Sports: 5 | Extracurriculars: 7
Seventh Day Adventist
300 42nd St SW
Loveland, CO 80537
(970) 667-5592
1907year founded
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Mile High Academy Photo
#7Mile High Academy
Gr: PK-12 | 256 students
Avg. class size: 15 students
Sports: 4 | Extracurriculars: 7
Seventh Day Adventist
1733 Dad Clark Drive
Littleton, CO 80126
(303) 744-1069
(3)
1913year founded
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Denver Christian School Photo
#8Denver Christian School
Gr: K-12 | 687 students
Avg. class size: 18 students
Sports: 10 | Extracurriculars: 14
Calvinist
3898 S. Teller St.
Denver, CO 80235
(303) 733-2421
1916year founded
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Belleview Christian School Photo
#9Belleview Christian School
Gr: NS-12 | 443 students
Avg. class size: 18 students
Sports: 5 | Extracurriculars: 8
Christian
3455 W 83rd Ave
Westminster, CO 80031
(303) 427-5459
(4)
1920year founded
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Map of Holy Family High School
#10(T10–T11)Holy Family High School
Gr: 9-12 | 642 students
Avg. class size: 27 students
Sports: 12
Catholic
5195 W 144th Ave
Broomfield, CO 80023
(303) 410-1411
1922year founded
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Kent Denver School Photo
#10(T10–T11)Kent Denver School
Gr: 6-12 | 784 students
Avg. class size: 15 students
Sports: 20 | Extracurriculars: 19
4000 East Quincy Avenue
Englewood, CO 80113
(303) 770-7660
1922year founded
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Fountain Valley School of Colorado Photo
#12Fountain Valley School of Colorado
Gr: 9-12 | 220 students
Avg. class size: 10 students
Sports: 11 | Extracurriculars: 21
6155 Fountain Valley School Road
Colorado Springs, CO 80911
(719) 391-5251
1930year founded
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Mullen High School Photo
#13Mullen High School
Gr: 9-12 | 860 students
Avg. class size: 20 students
Sports: 18
Catholic
3601 S Lowell Blvd
Denver, CO 80236
(303) 761-1764
(1)
1931year founded
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Colorado Rocky Mountain School Photo
#14Colorado Rocky Mountain School
Gr: 9-12 | 165 students
Avg. class size: 12 students
Sports: 10 | Extracurriculars: 36
500 Holden Way
Carbondale, CO 81623
(970) 963-2562
1953year founded
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Lutheran High School Photo
#15 Lutheran High School
Gr: 9-12 | 1,112 students
Avg. class size: 25 students
Sports: 14 | Extracurriculars: 20
Lutheran Church Missouri Synod
11249 N Newlin Gulch Blvd
Parker, CO 80134
(303) 841-5551
(3)
1955year founded
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Map of Steamboat Mountain School
#16Steamboat Mountain School
Gr: K-12 | 197 students
Avg. class size: 13 students
818 Oak St
Steamboat Springs, CO 80487
(970) 879-1350
(1)
1957year founded
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Map of Bishop Machebeuf High School
#17Bishop Machebeuf High School
Gr: 9-12 | 200 students
Avg. class size: 20 students
Sports: 11
Catholic
458 Uinta Way
Denver, CO 80230
(303) 344-0082
(1)
1958year founded
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Map of Transitional School
#18Transitional School
Gr: 6-11 | 9 students
Alternative School (Church of Christ)
14780 N 107th St
Longmont, CO 80504
(303) 776-6841
1960year founded
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The Colorado Springs School Photo
#19(T19–T20)The Colorado Springs School
Gr: PK-12 | 214 students
Avg. class size: 12 students
Sports: 7 | Extracurriculars: 17
21 Broadmoor Ave
Colorado Springs, CO 80906
(719) 434-3500
(1)
1962year founded
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Vail Mountain School Photo
#19(T19–T20)Vail Mountain School
Gr: K-12 | 418 students
Avg. class size: 15 students
Sports: 15
3000 Booth Falls Road
Vail, CO 81657
(970) 476-3850
(7)
1962year founded
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Map of Savio House
#21Savio House
Gr: 6-12 | 17 students
Special Education School
325 King St
Denver, CO 80219
(303) 225-4060
1966year founded
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Map of Yeshiva Toras Chaim High School
#22Yeshiva Toras Chaim High School
Gr: 9-12 | 64 students
All-boys (Jewish)
1555 Stuart St
Denver, CO 80204
(303) 629-8200
1967year founded
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Map of Ellicott Baptist School
#23Ellicott Baptist School
Gr: 3-12 | 15 students
Baptist
24075 State Highway 94
Calhan, CO 80808
(719) 683-2453
1968year founded
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Dawson School Photo
#24Dawson School
Gr: K-12 | 477 students
Avg. class size: 15 students
Sports: 11 | Extracurriculars: 7
10455 Dawson Drive
Lafayette, CO 80026
(303) 665-6679
(13)
1970year founded
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Map of Colorado Springs Christian Schools
#25(T25–T26) Colorado Springs Christian Schools
Gr: K-12 | 882 students
Sports: 11
Christian
4855 Mallow Rd
Colorado Springs, CO 80907
(719) 599-3553
(1)
1971year founded
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Map of Evangel Christian Academy
#25(T25–T26)Evangel Christian Academy
Gr: PK-12 | 272 students
Sports: 4 | Extracurriculars: 2
Presbyterian
4052 Nonchalant Circle S
Colorado Springs, CO 80917
(719) 597-3675
1971year founded
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Map of Beth Eden Baptist School
#27(T27–T29)Beth Eden Baptist School
Gr: K-12 | 143 students
Baptist
2600 Wadsworth Blvd
Wheat Ridge, CO 80033
(303) 232-2313
1972year founded
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Denver Academy Photo
#27(T27–T29)Denver Academy
Gr: 2-12 | 457 students
Avg. class size: 12 students
Sports: 11 | Extracurriculars: 11
Special Education School
4400 E Iliff Avenue
Denver, CO 80222
(303) 777-5161
1972year founded
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Map of Faith Christian High School
#27(T27–T29)Faith Christian High School
Gr: K-12 | 873 students
Avg. class size: 24 students
Christian
Administration Offices 12189 W 64th Ave
Arvada, CO 80004
(303) 424-7310
1972year founded
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Elmwood Christian Academy Photo
#30(T30–T31)Elmwood Christian Academy
Gr: PK-12 | 111 students
Avg. class size: 15 students
Sports: 3
Baptist
13100 East 144th Avenue
Brighton, CO 80601
(303) 659-3818
(7)
1973year founded
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September School Photo
#30(T30–T31)September School
Gr: 9-12 | 24 students
Avg. class size: 8 students
Sports: 1 | Extracurriculars: 8
96 Arapahoe Ave.
Boulder, CO 80302
(303) 443-9933
(1)
1973year founded
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Denver Waldorf School Photo
#32(T32–T33)Denver Waldorf School
Gr: PK-12 | 377 students
Avg. class size: 25 students
Sports: 4
Specialized Curriculum
2100 S. Pennsylvania St.
Denver, CO 80210
(303) 777-0531
(7)
1974year founded
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Map of Parkhill Christian Academy
#32(T32–T33)Parkhill Christian Academy
Gr: PK-9 | 57 students
Sports: 2
Baptist
4235 Parkhill Pl
Pueblo, CO 81008
(719) 544-6174
1974year founded
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Colorado Timberline Academy Photo
#34(T34–T35)Colorado Timberline Academy
Gr: 9-12 | 30 students
Avg. class size: 6 students
Sports: 10 | Extracurriculars: 3
Alternative School
454 Academy Drive
Durango, CO 81301
(970) 247-5898
(1)
1975year founded
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Dayspring Christian Academy Photo
#34(T34–T35)Dayspring Christian Academy
Gr: PK-12 | 565 students
Avg. class size: 15 students
Sports: 7 | Extracurriculars: 5
Christian
3734 W 20th St
Greeley, CO 80634
(970) 330-1151
(5)
1975year founded
View Profile
Show 63 more private schools in Colorado (out of 98 total schools)
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Frequently Asked Questions

What is the Colorado average private high schools founding year?
The Colorado average private high schools founding year is 1978 for 2026-27.
What are the private high schools with oldest founding year in Colorado?
The top ranked private high schools in Colorado include St. Mary's Academy, Regis Jesuit High School and St. Mary's High School.

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