#1 Fastest-Growing Private Schools in Ada County, ID
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
2026 lists
Fastest-Growing Private Schools in Ada County, ID
Private schools in Ada County, ID whose enrollment has grown the most over the past decade. Top 7 of 7 schools.
#2 Fastest-Growing Private Schools in Ada County, ID
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
#3 Fastest-Growing Private Schools in Ada County, ID
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
#4 Fastest-Growing Private Schools in Ada County, ID
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
#5 Fastest-Growing Private Schools in Ada County, ID
Bishop Kelly High School
Diocesan school · Grades 9–12
Enrollment up 34% in about a decade
Boise, ID
BOverall grade967 students16 students per teacher
#6 Fastest-Growing Private Schools in Ada County, ID
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
#7 Fastest-Growing Private Schools in Ada County, ID
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.