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St. Mary's Montessori School

Strong in Spirit, Steady in Purpose

The Rancho Campus
The North Fontana Campus

An authentic Montessori education, proudly serving families in Rancho Cucamonga and North Fontana for over 10 years

At St. Mary’s Montessori School, we are committed to excellence in providing compassionate, personalized care through mutual trust and respect, education, leadership, and service. Our mission is to nurture and celebrate each child’s academic and social abilities, fostering a lifelong love of learning through the principles of Dr. Maria Montessori and grounded in the teachings of the Catholic faith.

Serving families throughout Rancho Cucamonga, North Fontana, Etiwanda, and the surrounding Inland Empire, St. Mary’s offers an authentic Montessori education in thoughtfully prepared environments where children are known, respected, and guided toward independence, confidence, and a genuine joy for learning.

Rooted in Montessori principles and Catholic values, our community honors the dignity of each child while supporting their intellectual, social, emotional, and spiritual development.

Learn More About Admissions

Schedule Your Tour

Click on the campus below to fill out the pre-registration form and schedule your tour.

North Fontana Campus (6 weeks to 6 years old)
Rancho Cucamonga Campus (6 weeks to 12 years old)

Rancho Campus

Located in the charming Windrows Loop community of Rancho Cucamonga, just minutes from Victoria Gardens.

Serving children 6 weeks through 12 years of age.

North Fontana Campus

Located in the heart of North Fontana’s Heritage community, just minutes from the I-15 Freeway.

Serving children 6 weeks through 6 years of age.

  • Blue geometric wooden shapes, including spheres, cylinders, cones, and rectangular blocks, arranged on a white table in a classroom setting with shelves in the background.

    About Montessori

    The Montessori method, it is a unique method of education that focuses on and caters to the individual development of each child.

    learn more about Montessori

    why choose Montessori?

  • A child's hand is drawing and writing on graph paper with a red colored pencil, with the child's other hand resting on the paper.

    Academic Programs

    The Montessori environment offers quality, purposeful work for children to engage in. Each day, students are presented with lessons that are age-appropriate and challenge them to grow as critical thinkers and global citizens.

    more about our programs

  • "Best decision we have made for our son and as a family! Just in 3 months since enrolling our 2 year old son, we have seen such a huge difference in his social skills."

    — Natalie

  • "My daughter is 8 years old and just starting 3rd grade. She has been attending St. Mary's since she was 3 years old. We love everything about her school! The Teachers and staff are all so amazing and truly love our children. I have never had to worry about her while in their care. "

    — Jennifer

  • "Our oldest had the most amazing experience at St Mary's Montessori elementary program. He joined as a first grader and within the first few months, we saw him soar in his reading, math and language skills. By the end of his first year, he had made tremendous progress both academically and socially "

    — Gwenda

  • "My son has attended St. Mary's since pre-k. He is now finishing his 2nd year of the elementary program and I am so impressed with his worldly knowledge and academic progress. He has been exposed to higher learning concepts that he wouldn't have been in traditional public school. The biggest thing that I love about St. Mary's is that they have fostered a love of school and learning for him. He wakes up happy to go to school every day. I'm very glad we decided to begin his educational journey here."

    — Kelly

  • "Our toddler has been at St. Mary's since he was three months old. He clearly loves going to "school" each day, loves the staff, and always comes home happy. He surprises us frequently with skills he's learned while there. We love St. Mary's as first time parents in helping to "guide us" through things. You can read all the books out there, but having a team of experienced and highly trained experts to speak with is unbeatable. The teachers and staff at St. Mary's are, from what we see, incredibly caring, patient, and attentive. We've been amazed at the progress our son has made with his motor skills, language development, and socialization thanks to their dedicated work."

    — John