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²ÝÁñÉçÇø School Review - Established 2003
Greenleaf Friends Academy Top 3 · Oldest Founding Date (ID)
Nampa Christian Schools Top 5 · Lowest Acceptance Rate (ID)
Bishop Kelly High School Top 3 · Largest Endowment (ID)

Oldest ²ÝÁñÉçÇø High Schools in Idaho

The average private high school in Idaho was founded around 1979 (2026-27).
The oldest private high school in Idaho is Greenleaf Friends Academy, founded in 1908.

Quick Facts (2026-27)

  • # ID Schools Ranked: 30
  • Top 20 Range (Year Founded): 1908–1995
  • ID School Avg.: 1981
  • National School Avg.: 1967

Quick Facts (2026-27)

  • # ID Schools Ranked: 30
  • Top 20 Range (Year Founded): 1908–1995
  • ID School Avg.: 1981
  • National School Avg.: 1967
Show school map — Idaho (year founded range: 1908–1995, avg 1981)
Year Founded Range: 1908 2021 Avg. Year Founded: 1981

Oldest ²ÝÁñÉçÇø High Schools in Idaho (2026-27)

Showing 30 schools
Greenleaf Friends Academy Photo
#1Greenleaf Friends Academy
Gr: PK-12 | 280 students
Avg. class size: 15 students
Sports: 5 | Extracurriculars: 1
Friends
20565 Academy Rd
Greenleaf, ID 83626
(208) 459-6346
1908year founded
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Map of Beacon Christian School
#2(°Õ2–T3)Beacon Christian School
Gr: K-10 | 35 students
Avg. class size: 11 students
Seventh Day Adventist
615 Stewart Ave
Lewiston, ID 83501
(208) 743-8361
1918year founded
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Map of Gem State Adventist Academy
#2(°Õ2–T3)Gem State Adventist Academy
Gr: 9-12 | 60 students
Seventh Day Adventist
16115 S Montana Ave
Caldwell, ID 83607
(208) 459-1627
1918year founded
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Nampa Christian Schools Photo
#4Nampa Christian Schools
Gr: NS-12 | 1,053 students
Avg. class size: 25 students
Sports: 15 | Extracurriculars: 2
Christian
11920 W. Flamingo Avenue
Nampa, ID 83651
(208) 475-1697
1959year founded
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Bishop Kelly High School Photo
#5Bishop Kelly High School
Gr: 9-12 | 945 students
Avg. class size: 21 students
Sports: 19 | Extracurriculars: 32
Catholic
7009 Franklin Rd
Boise, ID 83709
(208) 375-6010
1964year founded
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Cole Valley Christian High School Photo
#6(°Õ6–T7) Cole Valley Christian High School
Gr: NS-12 | 1,517 students
Avg. class size: 24 students
Sports: 14 | Extracurriculars: 12
Christian
200 E Carlton Ave
Meridian, ID 83642
(208) 947-1212
(8)
1972year founded
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Map of Cole Valley Christian School
#6(°Õ6–T7)Cole Valley Christian School
Gr: 7-12 | 513 students
Avg. class size: 20 students
Christian
8775 W Ustick Rd
Boise, ID 83704
(208) 947-1212
1972year founded
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Sun Valley Community School Photo
#8Sun Valley Community School
Gr: PK-12 | 423 students
Avg. class size: 15 students
Sports: 22 | Extracurriculars: 11
Po Box 2118
Sun Valley, ID 83353
(208) 622-3960
1973year founded
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Map of Twin Falls Christian Academy
#9Twin Falls Christian Academy
Gr: NS-12 | 133 students
Baptist
798 Eastland Drive N
Twin Falls, ID 83301
(208) 733-1452
1975year founded
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Clear Lakes Christian Academy Photo
#10Clear Lakes Christian Academy
Gr: K-12 | 21 students
Baptist
440 Clear Lakes Rd
Buhl, ID 83316
(208) 543-8481
1978year founded
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Christian Center School Photo
#11Christian Center School
Gr: PK-12 | 239 students
Avg. class size: 20 students
Sports: 5 | Extracurriculars: 9
3639 W Prairie Ave
Hayden, ID 83835
(208) 772-7542
1979year founded
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Map of House Of The Lord Christian Academy
#12House Of The Lord Christian Academy
Gr: PK-12 | 195 students
Christian
754 Silver Birch Ln
Oldtown, ID 83822
(208) 437-2184
(1)
1980year founded
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Logos School Photo
#13(°Õ13–T14)Logos School
Gr: PK-12 | 634 students
Avg. class size: 19 students
Sports: 7 | Extracurriculars: 2
Christian
110 Baker St
Moscow, ID 83843
(208) 882-1226
1981year founded
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North Idaho Christian School Photo
#13(°Õ13–T14)North Idaho Christian School
Gr: K-12 | 181 students
Avg. class size: 23 students
Sports: 4 | Extracurriculars: 5
Alternative School
251 W Miles Ave
Hayden, ID 83835
(208) 772-7546
1981year founded
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Map of Silver Valley Christian Academy
#15Silver Valley Christian Academy
Gr: PK-12 | 39 students
Avg. class size: 12 students
Christian
514 West Brown Avenue
Kellogg, ID 83837
(208) 783-3791
1985year founded
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Map of Centennial Baptist School
#16(°Õ16–T17)Centennial Baptist School
Gr: NS-12 | 240 students
Sports: 5
Christian
3610 E. Ustick Rd
Caldwell, ID 83605
(208) 454-1997
1991year founded
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Project Patch School Photo
#16(°Õ16–T17)Project Patch School
Gr: 6-12 | 35 students
Extracurriculars: 6
Alternative School (Christian)
PO BOX 450
Garden Valley, ID 83622
(360) 690-8495
1991year founded
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Foothills School of Arts & Sciences Photo
#18Foothills School of Arts & Sciences
Gr: PK-9 | 158 students
Avg. class size: 13 students
Specialized Curriculum
601 South 9th Street
Boise, ID 83702
(208) 331-9260
1992year founded
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The Ambrose School Photo
#19(°Õ19–T21)The Ambrose School
Gr: PK-12 | 761 students
Avg. class size: 23 students
Sports: 7 | Extracurriculars: 8
Christian
6100 N. Locust Grove Rd.
Meridian, ID 83646
(208) 323-3888
(3)
1995year founded
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Classical Christian Academy Photo
#19(°Õ19–T21)Classical Christian Academy
Gr: PK-12 | 167 students
Avg. class size: 12 students
Sports: 4
Specialized Curriculum (Christian)
4810 N. Ramsey Road
Coeur D Alene, ID 83815
(208) 777-4400
1995year founded
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Map of Lighthouse Christian School
#19(°Õ19–T21)Lighthouse Christian School
Gr: PK-12 | 391 students
Avg. class size: 20 students
Sports: 8
Christian
960 Eastland Dr
Twin Falls, ID 83301
(208) 737-1425
1995year founded
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The North Fork School Photo
#22The North Fork School
Gr: 3-12 | 15 students
Avg. class size: 6 students
Specialized Curriculum
812 Reedy Lane
Mccall, ID 83638
(208) 630-4028
1996year founded
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Riverstone International School Photo
#23(°Õ23–T25)Riverstone International School
Gr: PK-12 | 355 students
Avg. class size: 15 students
Sports: 11 | Extracurriculars: 21
5521 E Warm Springs Ave
Boise, ID 83716
(208) 424-5000
(11)
1997year founded
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Map of St. John Bosco Academy
#23(°Õ23–T25)St. John Bosco Academy
Gr: PK-12 | 108 students
Avg. class size: 7 students
Sports: 2 | Extracurriculars: 7
Catholic
122 Substation Rd
Cottonwood, ID 83522
(208) 962-5650
1997year founded
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Watersprings School Photo
#23(°Õ23–T25)Watersprings School
Gr: PK-12 | 396 students
Avg. class size: 16 students
Sports: 7
Christian
4250 South 25th East
Idaho Falls, ID 83404
(208) 542-6250
(1)
1997year founded
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Map of Wisdom Ranch Vocational Gap Year
#26Wisdom Ranch Vocational Gap Year
Gr: 10-12
Avg. class size: 4 students
All-boys | Alternative School
4331 Champagne Creek Rd
Arco, ID 83213
(208) 527-8933
2001year founded
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Map of Genesis Preparatory Academy
#27Genesis Preparatory Academy
Gr: PK-12 | 501 students
Christian
1866 N Cecil Rd Bldg 2
Post Falls, ID 83854
(208) 691-0712
(1)
2005year founded
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Map of The Sage School
#28The Sage School
Gr: 6-12 | 83 students
Alternative School
1451 Aviation Dr
Hailey, ID 83333
(208) 788-0120
2009year founded
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Map of Heroes Academy
#29Heroes Academy
Gr: PK-12 | 79 students
Montessori School
5771 N Discovery Way
Boise, ID 83713
(208) 991-4376
(3)
2016year founded
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Acton Academy Twin Falls Photo
#30Acton Academy Twin Falls
Gr: NS-10 | 36 students
Avg. class size: 15 students
Sports: 1
Montessori School
1830 Addison Ave E
Twin Falls, ID 83301
(208) 420-9520
2021year founded
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Frequently Asked Questions

What is the Idaho average private high schools founding year?
The Idaho average private high schools founding year is 1979 for 2026-27.
What are the private high schools with oldest founding year in Idaho?
The top ranked private high schools in Idaho include Greenleaf Friends Academy, Beacon Christian School and Gem State Adventist Academy.

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