The Complete Guide to Montessori Education
Choosing an early childhood education path is one of the most important decisions a parent makes—and few approaches generate as much curiosity and occasional confusion as Montessori. What does a Montessori classroom actually look like? Is it better than traditional or play-based programs? And how do you know if it's right for your child?
This guide brings together everything we've explored across our blog—the philosophy, the research, the programs by age, and what to look for in a school—into one place. Whether you're just starting to research Montessori or you're comparing specific campuses in Oakville, Mississauga, or Burlington, consider this your starting point.
What Is Montessori Education?
Montessori education is a child-centered approach developed by Dr. Maria Montessori in the early 20th century, built on the belief that children learn best through self-directed activity, hands-on exploration, and collaborative play in a carefully prepared environment. Rather than a teacher delivering the same lesson to a full classroom at once, Montessori classrooms allow children to choose activities that interest them, working at their own pace within a structured set of options.
Today, the model has scaled well beyond its origins—more than 22,000 Montessori schools now operate in over 110 countries. But scale alone doesn't tell you whether the approach works. For a full breakdown of the philosophy, core principles, and the teacher's role in a Montessori classroom, see our detailed post: What Is Montessori Education and How Does It Work?
Does the Research Actually Support It?
This is the question most parents eventually ask, and it's a fair one. The good news: recent research gives a clearer answer than it used to.
A national randomized controlled trial published in October 2025 in the Proceedings of the National Academy of Sciences followed 588 children across 24 public Montessori programs—the first study of its kind at this scale. Researchers from the University of Virginia, the University of Pennsylvania, and the American Institutes for Research found that children in Montessori preschool programs showed stronger reading, executive function, and social understanding by the end of kindergarten than peers in traditional programs, at a lower cost per child.
That builds on earlier work, including a 2021 study connecting early Montessori education to long-term adult well-being and a 2025 follow-up study on "sensitive periods" in early Montessori learning. We've written in depth about both:
Nurturing Childhood for Lifelong Success: Insights from Western Heights Montessori — how the Montessori Casa program connects to childhood outcomes
The Long-Term Benefits of Montessori: Childhood Education and Adult Wellbeing — what happens decades later
Montessori vs. Play-Based and Traditional Programs
One of the most common comparisons parents make is Montessori against play-based preschool. Both value hands-on learning, but they differ in structure: Montessori's "freedom within limits" model still guides children toward specific developmental skills through purposefully designed materials, while pure play-based programs are typically more open-ended and less structured.
Neither approach is universally "better"—the right fit depends on your child's temperament and what you want from their early years. We've broken down the distinctions, including how order, structure, and independence show up differently in each model, in The Distinctive Educational Advantages of Montessori Over Play-Based Programs for Early Childhood Development.
Montessori Programs by Age
Montessori education is organized into distinct developmental stages, each with its own prepared environment and materials. At Western Heights Montessori, our programs span from infancy through Casa years:
Program | Typical Age Range | Focus |
Infant | 6 weeks – 18 months | Sensory development, trust, secure attachment |
Toddler | 15 – 30 months | Language explosion, independence, gross/fine motor skills |
Pre-Casa | 18 months – 3 years | Bridge between Toddler and Casa, transitional independence |
Casa (Children's House) | 2.5 – 6 years | Practical life, sensorial, language, math, cultural studies |
The Casa program in particular is where most of the "classic" Montessori materials and activities live—practical life exercises, sensorial work, and the beginnings of language and math. We cover this stage in detail, including a full breakdown of what a Casa classroom actually does day to day, in The Casa Curriculum: Unveiling Child-Centered Learning Pathways
You can also explore each program directly:
Infant Program
Toddler Program
Pre-Casa Program
Casa Program
What a Montessori Classroom Actually Looks Like
Walk into a genuine Montessori classroom and a few things stand out immediately. Furniture is child-sized. Materials are displayed on low, open shelves, each with a specific purpose and a built-in way for children to check their own work. Mixed-age groupings are common—a Casa classroom might have children from 2.5 to 6 years old working alongside each other, with older children naturally mentoring younger ones.
Teachers, often called "guides," take a different role than in a traditional classroom. Instead of leading every lesson from the front, they observe closely, introduce materials individually or in small groups, and step back to let children work independently once a concept is introduced.
Why Families Choose Montessori—and Why They Choose Western Heights
Beyond the research, there are practical reasons. Montessori resonates with families: it builds independence early, and it respects a child's individual pace rather than forcing a one-size-fits-all timeline, and it tends to produce children who are comfortable with both structure and self-direction—a combination that serves them well beyond preschool.
We've written more on what makes a Montessori education, and specifically a Western Heights education, worth choosing—including for families re-enrolling year over year—in A New Year, A Brighter Future: The Decision to Choose Western Heights Montessori.
Two Campuses Worth Knowing About
If you're weighing your options in Oakville, our Maple Grove campus ioffers the full span from infant through Casa—meaning a child can stay on one campus from six weeks old through to late Casa years without transferring schools. Learn more about Maple Grove's programs and community.
If you're in Burlington, our newest campus offers Toddler and Casa programs in a purpose-designed space, bringing the same Montessori approach described throughout this guide to families in the Burlington community. Visit the Burlington campus page to see photos, hours, and program details.
Both campuses—along with our five others across Oakville, Mississauga, and Burlington—are listed on our full locations page, where you can compare programs and find the one closest to you.
How to Choose the Right Montessori School
Not every school that uses the word "Montessori" follows the method with the same rigor — it isn't a trademarked term, so quality varies. A few things worth checking when evaluating any Montessori school:
Teacher credentials — look for AMI (Association Montessori Internationale) or AMS (American Montessori Society) certified guides
Mixed-age classrooms — a genuine Montessori environment groups children across a developmental span, not by single-year age bands
Uninterrupted work periods — children need long, uninterrupted blocks of time (often 2–3 hours) to engage deeply with materials
Authentic materials — the classic Montessori materials (pink tower, sandpaper letters, golden beads, etc.) should be present and in good condition
A visit — the best way to evaluate any school is to see a classroom in session; schedule a tour at any of our campuses
Frequently Asked Questions
What age does Montessori education start?
Montessori programs typically begin in infancy, as early as 6 weeks old in an infant program, and continue through Casa .
Is Montessori better than traditional schooling?
"Better" depends on your child and your goals. Research, including a 2025 national randomized controlled trial, shows Montessori students often outperform peers in traditional programs on reading, executive function, and social outcomes by kindergarten — but the right fit also depends on your child's temperament and how they respond to self-directed learning.
What's the difference between Montessori and play-based preschool?
Montessori uses purposefully designed materials and a structured—if flexible—environment to guide children toward specific skills, while play-based programs are generally more open-ended with less structured material design. Both value hands-on learning; the difference is in how much direction the environment itself provides.
How do I know if a school is "really" Montessori?
Look for mixed-age classrooms, AMI- or AMS-certified teachers, long uninterrupted work periods, and authentic Montessori materials on open shelving. Since "Montessori" isn't a protected term, the best way to verify quality is to visit and observe a classroom in session.
Does Western Heights Montessori offer programs for all ages?
Across our seven campuses in Oakville, Mississauga, and Burlington, we offer Infant, Toddler, Pre-Casa, and Casa programs. .
Ready to See Montessori in Action?
Reading about Montessori only goes so far—the best way to understand it is to see a classroom in session. Whether you're closest to our Maple Grove campus in Oakville or our Burlington campus, or any of our other five locations, we'd love to show you around. Schedule a tour today.
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