#1 Best Private 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 Schools in Idaho
Private schools in Idaho with the highest overall grades. Top 50 of 57 schools.
#2 Best Private 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 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 Schools in Idaho
Holy Rosary Catholic School
Parish school · Grades Pre-K–5
The only Catholic school in Idaho Falls
Idaho Falls, ID
A+Overall grade79 students12 students per teacher
#5 Best Private 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
#6 Best Private 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
#7 Best Private Schools in Idaho
Canyonside Christian School
Christian school (nondenominational) · Grades Pre-K–6
Smaller classes than 83% of Christian schools in Idaho
Jerome, ID
AOverall grade65 students6 students per teacher
#8 Best Private 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
#9 Best Private 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
#10 Best Private 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
#11 Best Private 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
#12 Best Private Schools in Idaho
Boise State University Trio Upward Bound
Alternative school · Grades 9–11
One of the most diverse private schools in Idaho
Boise, ID
A-Overall grade80 students6 students per teacher
#13 Best Private 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
#14 Best Private 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
#15 Best Private 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
#16 Best Private 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
#17 Best Private 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
#18 Best Private Schools in Idaho
St. Nicholas Catholic School
Diocesan school · Grades Pre-K–6
Growing: enrollment up 82% since 2011–12
Rupert, ID
B+Overall grade118 students17 students per teacher
#19 Best Private 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
#20 Best Private Schools in Idaho
Snake River Montessori School
Montessori school · Grades Pre-K–6
One of the 3 largest Montessori schools in Idaho
Ammon, ID
B+Overall grade62 students10 students per teacher
#21 Best Private 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
#22 Best Private Schools in Idaho
Gem State Adventist Academy
Seventh-day Adventist school · Grades 9–12
The smallest classes of any Christian school in Caldwell
Caldwell, ID
B+Overall grade78 students10 students per teacher
#23 Best Private Schools in Idaho
Montessori Academy
Montessori school · Grades Pre-K–6
One of the 3 largest Montessori schools in Idaho
Eagle, ID
B+Overall grade62 students10 students per teacher
#24 Best Private 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
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.