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2026 lists

Largest Private Schools in Boulder, CO

The private schools in Boulder, CO with the most students. Top 12 of 12 schools.

#1 Largest Private Schools in Boulder, CO

Boulder Country Day School

Independent school · Grades Pre-K–8

281 students

Boulder, CO

B+Overall grade281 students6 students per teacher

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#3 Largest Private Schools in Boulder, CO

Shining Mountain Waldorf School

Independent school · Grades Pre-K–12

170 students

Boulder, CO

B-Overall grade170 students10 students per teacher

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#4 Largest Private Schools in Boulder, CO

Sacred Heart of Jesus School

Parish school · Grades Pre-K–8

169 students

Boulder, CO

A+Overall grade169 students6 students per teacher

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#5 Largest Private Schools in Boulder, CO

Friends School

Independent school · Grades Pre-K–8

134 students

Boulder, CO

B-Overall grade134 students

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#6 Largest Private Schools in Boulder, CO

Watershed School

Independent school · Grades 6–12

114 students

Boulder, CO

BOverall grade114 students7 students per teacher

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#7 Largest Private Schools in Boulder, CO

Bixby School

Independent school · Grades Pre-K–5

93 students

Boulder, CO

A+Overall grade93 students4 students per teacher

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#8 Largest Private Schools in Boulder, CO

Jarrow Montessori School

Montessori school · Grades Pre-K–6

70 students

Boulder, CO

BOverall grade70 students8 students per teacher

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#12 Largest Private Schools in Boulder, CO

Temple Grandin School

Special education school · Grades 6–12

22 students

Boulder, CO

AOverall grade22 students3 students per teacher

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From official public records, updated October 2026.

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