Riverstone International School Photo - Riverstone International School is the premier, IB day/boarding school in Boise for Preschool-Gr 12 students. The school's 14 acre campus is nestled between the Boise River and the Greenbelt in Southeast Boise.

Top 5 Best Ada County Private High Schools (2025)

For the 2025 school year, there are 12 private high schools serving 4,453 students in Ada County, ID.
The top ranked private high schools in Ada County, ID include Cole Valley Christian High School, Riverstone International School, and The Ambrose School.
The average acceptance rate is 85%, which is higher than the Idaho private high school average acceptance rate of 84%.
50% of private high schools in Ada County, ID are religiously affiliated (most commonly Christian and Baptist).

Top Ranked Ada County Private High Schools (2025)

School
Location
Grades
Students
Cole Valley Christian High School
Cole Valley Christian High School Photo
(Christian)
(8)
200 E Carlton Ave
Meridian, ID 83642
(208) 947-1212
Grades: NS-12
| 1,337 students
5521 E Warm Springs Ave
Boise, ID 83716
(208) 424-5000
Grades: PK-12
| 416 students
The Ambrose School
The Ambrose School Photo
(Christian)
(3)
6100 N. Locust Grove Rd.
Meridian, ID 83646
(208) 323-3888
Grades: PK-12
| 761 students
Bishop Kelly High School
Bishop Kelly High School Photo
(Catholic)
7009 Franklin Rd
Boise, ID 83709
(208) 375-6010
Grades: 9-12
| 945 students
Cole Valley Christian School
(Christian)
8775 W Ustick Rd
Boise, ID 83704
(208) 947-1212
Grades: 7-12
| 513 students
Foothills School of Arts & Sciences
Foothills School of Arts & Sciences Photo - Foothills students become capable and confident learners during their time at Foothills! Foothills allows students to share their voice, empowers them to become critical thinkers and open-minded listeners, and promotes a positive school culture where everyone is valued.
Special Program Emphasis
601 South 9th Street
Boise, ID 83702
(208) 331-9260
Grades: PK-9
| 158 students
Hall Institute For The Arts
Special Program Emphasis
1167 E Iron Eagle Dr
Eagle, ID 83616
(208) 957-7024
Grades: 7-12
| 28 students
Heroes Academy
Montessori School
(3)
5771 N Discovery Way
Boise, ID 83713
(208) 991-4376
Grades: PK-12
| 79 students
Intermountain School & Hosp
Alternative School
303 N Allumbaugh St
Boise, ID 83704
(208) 350-2324
Grades: 7-12
| 20 students
One Stone
Alternative School
1151 W Miller St
Boise, ID 83702
(208) 451-3825
Grades: 9-12
| 126 students
Petra Christian Academy
(Christian)
3080 Wildwood St
Boise, ID 83713
(208) 505-0066
Grades: 1-9
| 24 students
Treasure Valley Baptist School
(Baptist)
1300 S Teare Ave
Meridian, ID 83642
(208) 898-9023
Grades: PK-11
| 46 students
[+] Show Closed Private Schools in Ada County, Idaho

Ada County Private Schools (Closed)

School
Location
Grades
Students
1439 S Weideman Ave
Boise, ID 83709
(208) 322-8981
Grades: PK-K
| 14 students
12000 W Fairview Ave
Boise, ID 83713
(208) 376-7272
Grades: K-6
| 66 students
Vineyard Christian Academy (Closed 2024)
Special Program Emphasis (Christian)
4950 N Bradley St
Garden City, ID 83714
(208) 562-4551
Grades: PK-8
| 108 students

Frequently Asked Questions

What are the top ranked private high schools in Ada County, ID?
The top ranked private high schools in Ada County, ID include Cole Valley Christian High School, Riverstone International School, and The Ambrose School.
How many private high schools are located in Ada County?
12 private high schools are located in Ada County.
How diverse are private high schools in Ada County?
Ada County private high schools are approximately 12% minority students, which is same as the Idaho private school average of 12%.
What percentage of private high schools are religiously affiliated in Ada County?
50% of private high schools in Ada County are religiously affiliated (most commonly Christian and Baptist).
Which private high schools in Ada County are often viewed compared to one another?

Recent Articles

A Parent's Guide To Understanding High School Teaching Methods
A Parent's Guide To Understanding High School Teaching Methods
This comprehensive guide helps parents navigate the various teaching methods used in today's high school classrooms. By understanding these approaches, you'll be better equipped to support your teen's learning journey, communicate effectively with teachers, and create a complementary learning environment at home.
Social Emotional Learning: Education's Hidden Symphony
February 08, 2025
Social Emotional Learning: Education's Hidden Symphony
A musician's perspective on Social Emotional Learning reveals how this educational framework orchestrates success through five essential emotional competencies.
A Roadmap For Starting A Private School
January 24, 2025
A Roadmap For Starting A Private School
Use this roadmap as a set of talking points with your trusted mentors and professionals to start the private school of your dreams. You're not alone. Over the years, hundreds of folks like you have had the same dream. From Quintilian to Maria Montessori to Lucy Madeira Wing, visionary educators have established schools to teach according to their beliefs and methodologies.