#1 Best Private Middle Schools in Ada County, ID
Riverstone International School
Independent school · Grades Pre-K–12
The smallest classes of any independent school in Boise
Boise, ID
A+Overall grade349 students5 students per teacher
2026 lists
Best Private Middle Schools in Ada County, ID
Private schools in Ada County, ID with middle-school grades and the highest overall grades. Top 10 of 10 schools.
#2 Best Private Middle Schools in Ada County, ID
St. Marys School
Diocesan school · Grades Pre-K–8
Smaller classes than 92% of Catholic schools in Idaho
Boise, ID
A+Overall grade109 students6 students per teacher
#3 Best Private Middle Schools in Ada County, ID
St. Marks Elementary School
Parish school · Grades Pre-K–8
Serving families in Boise since at least 2011
Boise, ID
AOverall grade323 students14 students per teacher
#4 Best Private Middle Schools in Ada County, ID
St. Joseph's Catholic School
Diocesan school · Grades K–8
One of the 3 largest Catholic schools in Idaho
Boise, ID
B+Overall grade367 students15 students per teacher
#5 Best Private Middle Schools in Ada County, ID
Boise Valley Adventist School
Seventh-day Adventist school · Grades Pre-K–8
Growing: enrollment up 42% since 2011–12
Boise, ID
BOverall grade75 students13 students per teacher
#6 Best Private Middle Schools in Ada County, ID
Sacred Heart Catholic School
Diocesan school · Grades Pre-K–8
Growing: enrollment up 39% since 2011–12
Boise, ID
BOverall grade195 students15 students per teacher
#7 Best Private Middle Schools in Ada County, ID
Calvary Christian School
Christian school (nondenominational) · Grades Pre-K–8
Growing: enrollment up 103% since 2011–12
Boise, ID
BOverall grade223 students13 students per teacher
#8 Best Private Middle Schools in Ada County, ID
Calvary Meridian Prep Academy
Christian school (nondenominational) · Grades K–10
One of the most diverse private schools in Idaho
Meridian, ID
BOverall grade185 students15 students per teacher
#9 Best Private Middle Schools in Ada County, ID
St. Ignatius Catholic School
Diocesan school · Grades Pre-K–8
The only Catholic school in Meridian
Meridian, ID
B-Overall grade428 students18 students per teacher
#10 Best Private Middle Schools in Ada County, ID
Cole Valley Christian Schools-Secondary
Christian school (nondenominational) · Grades Pre-K–12
The largest of 52 Christian schools in Idaho
Meridian, ID
B-Overall grade1,263 students16 students per teacher
Grades compare each school's official facts, such as class size, how long it has served families and where graduates go, with similar schools. They're a starting point: visit, ask questions and trust what you see.