#1 Best Private Schools in Boulder County, CO
Sacred Heart of Jesus School
Parish school · Grades Pre-K–8
The only Catholic school in Boulder
Boulder, CO
A+Overall grade169 students6 students per teacher
2026 lists
Best Private Schools in Boulder County, CO
Private schools in Boulder County, CO with the highest overall grades. Top 12 of 12 schools.
#2 Best Private Schools in Boulder County, CO
St. John the Baptist Catholic School
Diocesan school · Grades Pre-K–8
The only Catholic school in Longmont
Longmont, CO
A+Overall grade185 students10 students per teacher
#3 Best Private Schools in Boulder County, CO
St. Louis Catholic School
Parish school · Grades Pre-K–8
The only Catholic school in Louisville
Louisville, CO
A+Overall grade93 students8 students per teacher
#4 Best Private Schools in Boulder County, CO
Bixby School
Independent school · Grades Pre-K–5
The smallest classes of any independent school in Boulder
Boulder, CO
A+Overall grade93 students4 students per teacher
#5 Best Private Schools in Boulder County, CO
Shining Mtn. Waldorf High School
Independent school · Grades Pre-K–12
100% of graduates go to four-year colleges
Boulder, CO
AOverall grade188 students5 students per teacher
#6 Best Private Schools in Boulder County, CO
Rocky Mountain Christian Academy
Christian school (nondenominational) · Grades Pre-K–8
Smaller classes than 73% of Christian schools in Colorado
Niwot, CO
A-Overall grade98 students7 students per teacher
#7 Best Private Schools in Boulder County, CO
Boulder Valley Waldorf School
Independent school · Grades Pre-K–8
Smaller classes than 68% of independent schools in Colorado
Niwot, CO
A-Overall grade95 students5 students per teacher
#8 Best Private Schools in Boulder County, CO
Boulder Country Day School
Independent school · Grades Pre-K–8
The largest independent school in Boulder
Boulder, CO
B+Overall grade281 students6 students per teacher
#9 Best Private Schools in Boulder County, CO
Watershed School
Independent school · Grades 6–12
100% of graduates go to four-year colleges
Boulder, CO
BOverall grade114 students7 students per teacher
#10 Best Private Schools in Boulder County, CO
Jarrow Montessori School
Montessori school · Grades Pre-K–6
The largest Montessori school in Boulder
Boulder, CO
BOverall grade70 students8 students per teacher
#11 Best Private Schools in Boulder County, CO
Shining Mountain Waldorf School
Independent school · Grades Pre-K–12
One school from pre-K through 12th grade
Boulder, CO
B-Overall grade170 students10 students per teacher
#12 Best Private Schools in Boulder County, CO
Friends School
Independent school · Grades Pre-K–8
One of 8 independent schools in Boulder
Boulder, CO
B-Overall grade134 students
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.