The Research Behind Montessori Education: What the Studies Actually Show

Parents hear a lot of claims about different educational approaches. Montessori is no exception. But what makes Montessori unusual is the volume of peer-reviewed, university-led research behind it. These aren't opinion pieces or anecdotes. They're randomised controlled trials published in journals like Science, PNAS, and Frontiers in Psychology.

Here's what the research actually shows about how Montessori education affects children's development.

Reading at the 71st Percentile

In 2025, a team led by Professor Angeline Lillard at the University of Virginia published the largest randomised controlled trial of Montessori education ever conducted. The study, published in Proceedings of the National Academy of Sciences (PNAS), followed 588 children across 24 public Montessori schools in the United States.

Children who attended Montessori preschool performed at the 71st percentile in readingby the end of kindergarten, compared to the 50th percentile for children in traditional programmes. That's not a marginal difference. It means the average Montessori child was outperforming roughly seven out of ten of their traditionally-schooled peers in reading.

The same study found Montessori children scored at the 60th percentile for executive function (the ability to focus, plan, and self-regulate) and the 59th percentile for social understanding (theory of mind). Crucially, these benefits grew over timerather than fading, the opposite of the typical “fadeout” seen with other preschool programmes.

2.4 Times More Likely to Reason with Fairness

The study that put Montessori on the scientific map was published in Science in 2006, one of the most prestigious journals in the world. Lillard and Else-Quest studied 112 children in Milwaukee who had been admitted to a public Montessori school by lottery, creating a natural randomised experiment.

At age five, Montessori children scored significantly higher in reading, maths, and executive function. But the social findings were equally striking. When asked to resolve a conflict, 43% of Montessori children referenced justice or fairness in their reasoning, compared to just 18% of traditionally-schooled children. That's 2.4 times more likely to use fairness-based reasoning.

On the playground, Montessori children were also observed engaging in significantly more positive, collaborative play.

Closing the Income Achievement Gap by Two-Thirds

One of the most powerful findings in Montessori research comes from a 2017 longitudinal study, also led by Lillard, published in Frontiers in Psychology. The study tracked 141 children over three years, from ages three to six, using lottery-based admission.

In traditional school settings, lower-income children scored a full standard deviation below their higher-income peers. In Montessori settings, that gap shrank to just one-third of a standard deviation. The income achievement gap was reduced by two-thirds.

By the end of the study, lower-income Montessori children were performing at the same level as higher-income children in both school types. Montessori didn't just improve outcomes. It equalised them.

Benefits That Last Into Adulthood

A common concern with early years programmes is whether the benefits “fade out” once children move to primary school. The evidence suggests Montessori benefits do the opposite.

A 2007 study by Dohrmann and colleagues tracked Milwaukee public school graduates who had attended Montessori from preschool through to Year 5. In high school, these students scored approximately one-third of a standard deviation higher on standardised maths and science tests. The early advantage persisted into adolescence.

In France, a randomised controlled trial found that Montessori children who were tested five years after leavingthe Montessori environment outperformed their peers in mathematical problem-solving. The maths advantage wasn't present in kindergarten. It emerged years later, suggesting Montessori builds foundational thinking skills that compound over time.

And in 2021, Lillard surveyed 1,905 adults and found that those with two or more years of Montessori education scored significantly higher on measures of general wellbeing, engagement, social trust, and self-confidence. The strongest effects were found for those who attended Montessori between ages three and six, exactly the nursery years.

Creativity and Intrinsic Motivation

A 2019 Swiss study of 201 children found that Montessori pupils outperformed on both academic outcomes and creativity, including divergent and convergent thinking. A mediation analysis showed that it was specifically the creative skills that drove the academic advantage, not executive function alone.

Research by Rathunde and Csikszentmihalyi (the psychologist who coined the concept of “flow”) found that Montessori students reported significantly greater intrinsic motivation, energy, and “flow states” during academic work. They weren't just learning more. They were enjoying the process of learning itself.

Why This Matters for Your Child

These aren't studies from Montessori advocacy groups. They're randomised controlled trials, the gold standard in research, published in the world's top scientific journals. The consistent finding across two decades of research is clear: Montessori education produces stronger academic outcomes, better social development, greater creativity, and benefits that persist long after the nursery years.

At Buckingham Montessori, we combine the Montessori method with the UK's EYFS framework, giving children the proven benefits of child-led discovery within a structure that ensures every developmental milestone is met. If you'd like to see what research-backed education looks like in practice, book a visit and watch our children in action.

Studies Referenced

Lillard, A. S. et al. (2025). A national randomised controlled trial of the impact of public Montessori preschool at the end of kindergarten. PNAS.

Lillard, A. S. & Else-Quest, N. (2006). Evaluating Montessori Education. Science, 313(5795), 1893-1894.

Lillard, A. S. et al. (2017). Montessori Preschool Elevates and Equalises Child Outcomes. Frontiers in Psychology, 8, 1783.

Lillard, A. S. et al. (2021). An Association Between Montessori Education in Childhood and Adult Wellbeing. Frontiers in Psychology, 12.

Dohrmann, K. R. et al. (2007). High School Outcomes for Students in a Public Montessori Program. Journal of Research in Childhood Education, 22(2).

Denervaud, S. et al. (2019). Beyond executive functions, creativity skills benefit academic outcomes. PLoS ONE, 14(1).

Rathunde, K. & Csikszentmihalyi, M. (2005). Middle School Students' Motivation and Quality of Experience. American Journal of Education, 111(3).

Croset, M. C. et al. (2025). Early Montessori education shows delayed benefits for mathematical problem-solving. Scientific Reports (Nature).