#1 Fastest-Growing Private Schools in Idaho
Sandpoint Christian School
Christian school (nondenominational) · Grades Pre-K–8
Enrollment up 169% in about a decade
Ponderay, ID
B-Overall grade121 students17 students per teacher
2026 lists
Fastest-Growing Private Schools in Idaho
Private schools in Idaho whose enrollment has grown the most over the past decade. Top 23 of 23 schools.
#2 Fastest-Growing Private Schools in Idaho
The Sage School
Alternative school · Grades 6–12
Enrollment up 127% in about a decade
Hailey, ID
A-Overall grade91 students7 students per teacher
#3 Fastest-Growing Private Schools in Idaho
Calvary Christian School
Christian school (nondenominational) · Grades Pre-K–8
Enrollment up 103% in about a decade
Boise, ID
BOverall grade223 students13 students per teacher
#4 Fastest-Growing Private Schools in Idaho
St. Nicholas Catholic School
Diocesan school · Grades Pre-K–6
Enrollment up 82% in about a decade
Rupert, ID
B+Overall grade118 students17 students per teacher
#5 Fastest-Growing Private Schools in Idaho
Cole Valley Christian Schools-Secondary
Christian school (nondenominational) · Grades Pre-K–12
Enrollment up 80% in about a decade
Meridian, ID
B-Overall grade1,263 students16 students per teacher
#6 Fastest-Growing Private Schools in Idaho
Classical Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
Enrollment up 66% in about a decade
Rathdrum, ID
A-Overall grade212 students10 students per teacher
#7 Fastest-Growing Private Schools in Idaho
All Saints Catholic School
Diocesan school · Grades Pre-K–8
Enrollment up 64% in about a decade
Lewiston, ID
B-Overall grade216 students18 students per teacher
#8 Fastest-Growing Private Schools in Idaho
Greenleaf Friends Academy
Quaker (Friends) school · Grades K–12
Enrollment up 55% in about a decade
Greenleaf, ID
B-Overall grade228 students14 students per teacher
#9 Fastest-Growing Private Schools in Idaho
Gem State Adventist Academy
Seventh-day Adventist school · Grades 9–12
Enrollment up 44% in about a decade
Caldwell, ID
B+Overall grade78 students10 students per teacher
#10 Fastest-Growing Private Schools in Idaho
St. Edwards Catholic School
Diocesan school · Grades Pre-K–8
Enrollment up 43% in about a decade
Twin Falls, ID
BOverall grade157 students
#11 Fastest-Growing Private Schools in Idaho
Grace Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–12
Enrollment up 42% in about a decade
Pocatello, ID
A+Overall grade430 students9 students per teacher
#12 Fastest-Growing Private Schools in Idaho
Holy Family Catholic School
Diocesan school · Grades Pre-K–8
Enrollment up 42% in about a decade
Coeur d'Alene, ID
AOverall grade241 students14 students per teacher
#13 Fastest-Growing Private Schools in Idaho
Boise Valley Adventist School
Seventh-day Adventist school · Grades Pre-K–8
Enrollment up 42% in about a decade
Boise, ID
BOverall grade75 students13 students per teacher
#14 Fastest-Growing Private Schools in Idaho
Sacred Heart Catholic School
Diocesan school · Grades Pre-K–8
Enrollment up 39% in about a decade
Boise, ID
BOverall grade195 students15 students per teacher
#15 Fastest-Growing Private Schools in Idaho
Lighthouse Christian School
Christian school (nondenominational) · Grades Pre-K–12
Enrollment up 36% in about a decade
Twin Falls, ID
B-Overall grade305 students15 students per teacher
#16 Fastest-Growing Private Schools in Idaho
Bishop Kelly High School
Diocesan school · Grades 9–12
Enrollment up 34% in about a decade
Boise, ID
BOverall grade967 students16 students per teacher
#17 Fastest-Growing Private Schools in Idaho
House of the Lord Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
Enrollment up 31% in about a decade
Oldtown, ID
BOverall grade130 students8 students per teacher
#18 Fastest-Growing Private Schools in Idaho
Sandpoint Waldorf School
Independent school · Grades Pre-K–8
Enrollment up 29% in about a decade
Sandpoint, ID
BOverall grade152 students9 students per teacher
#19 Fastest-Growing Private Schools in Idaho
Immanuel Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–5
Enrollment up 24% in about a decade
Twin Falls, ID
B-Overall grade186 students17 students per teacher
#20 Fastest-Growing Private Schools in Idaho
Riverstone International School
Independent school · Grades Pre-K–12
Enrollment up 20% in about a decade
Boise, ID
A+Overall grade349 students5 students per teacher
#21 Fastest-Growing Private Schools in Idaho
Watersprings School
Christian school (nondenominational) · Grades Pre-K–12
Enrollment up 19% in about a decade
Idaho Falls, ID
A-Overall grade364 students12 students per teacher
#22 Fastest-Growing Private Schools in Idaho
Pioneer Montessori School
Montessori school · Grades Pre-K–6
Enrollment up 18% in about a decade
Ketchum, ID
BOverall grade104 students13 students per teacher
#23 Fastest-Growing Private Schools in Idaho
St. Joseph's Catholic School
Diocesan school · Grades K–8
Enrollment up 11% in about a decade
Boise, ID
B+Overall grade367 students15 students per teacher
From official public records, updated October 2026.