#1 Best Private Middle Schools in Idaho
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 Idaho
Private schools in Idaho with middle-school grades and the highest overall grades. Top 44 of 44 schools.
#2 Best Private Middle Schools in Idaho
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 Idaho
Grace Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–12
The only Christian school in Pocatello
Pocatello, ID
A+Overall grade430 students9 students per teacher
#4 Best Private Middle Schools in Idaho
Sun Valley Community School-Upper
Independent school · Grades Pre-K–12
The smallest classes of any independent school in Sun Valley
Sun Valley, ID
A+Overall grade397 students5 students per teacher
#5 Best Private Middle Schools in Idaho
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
#6 Best Private Middle Schools in Idaho
St. Mary's Parish School
Parish school · Grades Pre-K–8
The only Catholic school in Moscow
Moscow, ID
AOverall grade84 students9 students per teacher
#7 Best Private Middle Schools in Idaho
Holy Family Catholic School
Diocesan school · Grades Pre-K–8
The only Catholic school in Coeur d'Alene
Coeur d'Alene, ID
AOverall grade241 students14 students per teacher
#8 Best Private Middle Schools in Idaho
The Sage School
Alternative school · Grades 6–12
Growing: enrollment up 127% since 2011–12
Hailey, ID
A-Overall grade91 students7 students per teacher
#9 Best Private Middle Schools in Idaho
Sts. Peter & Paul School
Parish school · Grades Pre-K–8
Smaller classes than 62% of Catholic schools in Idaho
Grangeville, ID
A-Overall grade63 students13 students per teacher
#10 Best Private Middle Schools in Idaho
Watersprings School
Christian school (nondenominational) · Grades Pre-K–12
The largest Christian school in Idaho Falls
Idaho Falls, ID
A-Overall grade364 students12 students per teacher
#11 Best Private Middle Schools in Idaho
Calvary Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
Smaller classes than 76% of Christian schools in Idaho
Emmett, ID
A-Overall grade123 students8 students per teacher
#12 Best Private Middle Schools in Idaho
Classical Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
The only Christian school in Rathdrum
Rathdrum, ID
A-Overall grade212 students10 students per teacher
#13 Best Private Middle Schools in Idaho
Sun Valley Community School
Independent school · Grades Pre-K–12
100% of graduates go to four-year colleges
Sun Valley, ID
B+Overall grade391 students7 students per teacher
#14 Best Private Middle Schools in Idaho
Cornerstone Christian School
Christian school (nondenominational) · Grades K–8
Serving families in Lewiston since at least 2011
Lewiston, ID
B+Overall grade107 students10 students per teacher
#15 Best Private Middle Schools in Idaho
Calvary Christian School
Christian school (nondenominational) · Grades Pre-K–12
Serving families in Nampa since at least 2011
Nampa, ID
B+Overall grade73 students14 students per teacher
#16 Best Private Middle Schools in Idaho
Sun Valley Community School-Middle
Independent school · Grades Pre-K–12
One of the 3 largest independent schools in Idaho
Sun Valley, ID
B+Overall grade397 students8 students per teacher
#17 Best Private Middle Schools in Idaho
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
#18 Best Private Middle Schools in Idaho
Mountain View Christian School
Mennonite school · Grades 1–8
A Christian school in Bonners Ferry
Bonners Ferry, ID
BOverall grade79 students11 students per teacher
#19 Best Private Middle Schools in Idaho
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
#20 Best Private Middle Schools in Idaho
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
#21 Best Private Middle Schools in Idaho
Watersprings School
Christian school (nondenominational) · Grades Pre-K–12
One school from pre-K through 12th grade
Idaho Falls, ID
BOverall grade363 students12 students per teacher
#22 Best Private Middle Schools in Idaho
Christian Center School
Christian school (nondenominational) · Grades Pre-K–12
One of the most diverse private schools in Idaho
Hayden, ID
BOverall grade230 students13 students per teacher
#23 Best Private Middle Schools in Idaho
House of the Lord Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
Smaller classes than 76% of Christian schools in Idaho
Oldtown, ID
BOverall grade130 students8 students per teacher
#24 Best Private Middle Schools in Idaho
Pine Grove Academy
Latter-day Saints school · Grades Pre-K–8
The smallest classes of any Christian school in Post Falls
Post Falls, ID
BOverall grade102 students7 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.