草榴社区

Cornerstone Montessori Photo #0

Cornerstone Montessori

1644 Gault St
Sumner, WA 98390
Cornerstone Montessori Full-Day and Part-Time Programs are offered to families that want childcare as well as desire a Montessori learning environment.
Our school hours are 6:30am to 5:30pm, with full-day and half-day options, as well as 2, 3, and 5 days a week. Certain schedules may only be available on a limited basis, depending on the school year.
We currently have options from the ages of 3 months to 6th grade.
Cornerstone Montessori strives to create an atmosphere for children that promotes fun, independence, responsibility, and respect.
Cornerstone Montessori aims to provide a carefully planned, stimulating environment which will help children to develop within themselves the foundational attitudes, habits and skills that are essential for a lifetime of creative thinking and learning.
We strive to create an atmosphere that promotes fun, independence, responsibility and respect.
In the Montessori classroom, the teacher prepares the environment with hands on experimental activities in the area of art, music, science, math, geography, language, daily living skills and social etiquette.
The teacher guides, but it is the child who learns, who is motivated from within through the actual work itself.  Summer programs available!

Quick Facts (2026)

  • School Type: Montessori School
  • Grades: Nursery/Preschool-6
  • Enrollment: 115 students
  • Average class size: 15 students
  • Application Deadline: None / Rolling
  • Source: Verified school update

School Overview

School Type
Religious Affiliation
Grades Offered
Grades Nursery/Preschool-6
Year Founded
1990
Summer School Offered
Yes
School Calendar

Student Body

Total Students
115 students
Student Body Type
Co-ed
% Students of Color
29%
State avg.: 31%
Students by Grade

Academics and Faculty

Total Classroom Teachers
8 teachers
Student-Teacher Ratio
14:1
National avg.:
% Faculty w/Advanced Degree
30%
Average Class Size
15 students
Classroom Dress Code
Casual

Tuition and Acceptance Rate

Admission Deadline
None / Rolling
Tuition Notes
ine/tuition
Summer Program Cost
$990

Extracurriculars

Total ExtracurricularsTotal Extra-curric.
2 extracurriculars
ExtracurricularsExtra-curric.
Club or Organization:
Spanish Lessons


Arts and Music Programs:
Music Lessons

School Notes

  • Cornerstone Montessori Full-Day and Part-Time Programs are offered to families that want childcare as well as desire a Montessori learning environment.Our school hours are 6:30am to 5:30pm, with full-day and half-day options, as well as 2, 3, and 5 days a week. Certain schedules may only be available on a limited basis, depending on the school year.We currently have options from the ages of 3 months to 6th grade.Cornerstone Montessori strives to create an atmosphere for children that promotes fun, independence, responsibility, and respect.Cornerstone Montessori aims to provide a carefully planned, stimulating environment which will help children to develop within themselves the foundational attitudes, habits and skills that are essential for a lifetime of creative thinking and learning.We strive to create an atmosphere that promotes fun, independence, responsibility and respect.In the Montessori classroom, the teacher prepares the environment with hands on experimental activities in the area of art, music, science, math, geography, language, daily living skills and social etiquette.The teacher guides, but it is the child who learns, who is motivated from within through the actual work itself.Summer programs available!
Source: Verified school update

Frequently Asked Questions

How much does Cornerstone Montessori cost?
Cornerstone Montessori's tuition is approximately $990 for summer students.
When is the application deadline for Cornerstone Montessori?
The application deadline for Cornerstone Montessori is rolling (applications are reviewed as they are received year-round).

School Reviews

Endorse Cornerstone Montessori. Endorsements should be a few sentences in length. Please include any comments on:

  • Quality of academic programs, teachers, and facilities
  • Availability of music, art, sports and other extracurricular activities
  • Academic or athletic awards
Endorse this school:

Recent Articles

Summer Learning Loss Prevention Strategies for Families
Summer Learning Loss Prevention Strategies for Families
Learn how high-performing families prevent summer learning loss with smart routines, reading plans, enrichment, and balanced schedules.
Study Skills Every 草榴社区 School Student Should Master
Study Skills Every 草榴社区 School Student Should Master
Discover the essential study skills private school students should master by age 12 to build confidence, organization, and long-term academic success.
Benefits of Montessori 草榴社区 Schools in 2026
Benefits of Montessori 草榴社区 Schools in 2026
Explore the benefits of Montessori private schools, including independence, personalized learning, and long-term academic growth.

Quick Facts (2026)

  • School Type: Montessori School
  • Grades: Nursery/Preschool-6
  • Enrollment: 115 students
  • Average class size: 15 students
  • Application Deadline: None / Rolling
  • Source: Verified school update

Request Information

Did You Know?

The average private school tuition in Pierce County, WA is $12,840 for elementary schools and $16,194 for high schools (read more about average private school tuition across the country).
The average acceptance rate in Pierce County, WA is 88% (read more about average acceptance rates across the country).

Quick Links