#1 Fastest-Growing Private Schools in Yellowstone County, MT
Billings Christian School
Christian school (nondenominational) · Grades Pre-K–12
Enrollment up 310% in about a decade
Billings, MT
A+Overall grade443 students8 students per teacher
2026 lists
Fastest-Growing Private Schools in Yellowstone County, MT
Private schools in Yellowstone County, MT whose enrollment has grown the most over the past decade. Top 5 of 5 schools.
#2 Fastest-Growing Private Schools in Yellowstone County, MT
St. Francis Catholic School
Diocesan school · Grades K–8
Enrollment up 275% in about a decade
Billings, MT
B-Overall grade603 students13 students per teacher
#3 Fastest-Growing Private Schools in Yellowstone County, MT
Grace Montessori Academy
Christian (nondenominational) · Montessori · Grades Pre-K–8
Enrollment up 153% in about a decade
Billings, MT
BOverall grade91 students9 students per teacher
#4 Fastest-Growing Private Schools in Yellowstone County, MT
Yellowstone Academy
Special education school · Grades 6–12
Enrollment up 134% in about a decade
Billings, MT
AOverall grade75 students5 students per teacher
#5 Fastest-Growing Private Schools in Yellowstone County, MT
Trinity Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
Enrollment up 10% in about a decade
Billings, MT
B-Overall grade219 students21 students per teacher
From official public records, updated October 2026.