Delaying kindergarten may have limited benefit

The Kindergarten Cutoff Conundrum: Does Starting School Later Truly Benefit Children?

For many parents, the approach of a child's fifth birthday brings a familiar anxiety: the kindergarten enrollment deadline. With cutoffs often set for September 1st, children born just weeks later find themselves on the cusp, prompting a difficult decision that can involve significant financial and emotional investment. Should you push for early enrollment, or consider holding your child back a year?

The "Redshirting" Debate: A Closer Look at the Data

The practice of intentionally delaying a child's entry into kindergarten, often referred to as "redshirting" – a term borrowed from athletic eligibility rules – has gained traction, fueled by the perception that starting school older offers a distinct academic advantage. The idea is that an extra year allows children, particularly boys, more time to mature physically and cognitively, setting them up for greater success in the academic arena.

However, emerging research suggests that these perceived benefits may be fleeting. A comprehensive analysis by NWEA, an organization known for its Measures of Academic Progress (MAP) assessments, indicates that any academic edge gained by being among the older children in a kindergarten class tends to dissipate by the time students reach third grade.

Megan Kuhfeld, director of growth modeling and data analytics at NWEA, shared insights from the study. "For the average kid, they’re not going to get that much of an advantage," she stated, highlighting that the initial boost observed in early academic performance doesn't translate into long-term academic superiority.

Unpacking the NWEA Study: Early Gains, Later Parity

NWEA’s extensive research involved a deep dive into the academic trajectories of approximately 3 million students who took the MAP Growth assessment from kindergarten through second grade between 2017 and 2025. Furthermore, a specific cohort of students who started kindergarten in the 2021-22 academic year were tracked through third grade to compare their performance against their initial entry scores.

The findings revealed a measurable advantage for children who started kindergarten a year later than their age-eligible peers. These "redshirted" children demonstrated academic gains in reading and math that represented a significant portion of a school year's learning, estimated to be between 20 percent and 30 percent of an academic year's worth of progress compared to their younger classmates.

Yet, this academic lead proved to be temporary. By the time these students reached third grade, the study found no discernible difference in academic achievement between those who had been held back and their peers who started kindergarten at the earliest eligible age.

Potential Explanations for the Fading Advantage

While the NWEA study focused on academic outcomes, Kuhfeld offered several hypotheses for why the initial advantages of redshirting diminish over time. One theory suggests that the presence of older, more mature children in the classroom can serve as positive role models for younger students, influencing both academic engagement and behavior.

Conversely, children who start school already possessing a strong grasp of the kindergarten curriculum might experience boredom if the classroom pace doesn't accelerate to meet their advanced understanding. Teachers are often focused on supporting students who require additional help, potentially leaving children who are ahead with fewer opportunities for advanced challenges.

Kuhfeld also pointed out that children who are significantly older than their grade-level peers may lack older role models within their immediate classroom environment, a dynamic that could influence their own development and learning approach.

The Surprising Rarity of Redshirting

One of the more unexpected findings from the NWEA analysis was the relatively low prevalence of redshirting. Across the years studied, only about 5 percent of kindergartners began school a year after they were officially eligible, with a peak of 6.4 percent in the fall of 2021.

The demographic profile of children who are redshirted shows a tendency towards white students and boys. This practice was also found to be more common in schools serving low-poverty populations and in rural settings. Despite its statistical rarity, the concept of redshirting appears to be a topic of considerable discussion and parental concern.

Kuhfeld suggests this heightened awareness might stem from increasing concerns about the academic rigor of kindergarten and the perceived demands placed on young children. The idea of holding children back, particularly boys, gained further attention following a widely discussed article by author Richard Reeves, who advocated for redshirting all boys to allow for additional developmental time.

Beyond Academics: Considering the Broader Implications

It is crucial to remember that the NWEA study's primary focus was on academic performance. Kuhfeld emphasized that decisions about kindergarten enrollment should consider a child's individual needs, including behavioral development and social-emotional well-being, which were not the central focus of this particular analysis.

The social implications of being older than one's peers can extend far beyond the early school years. Parents might not immediately consider the long-term effects of having a child who is among the first in their peer group to navigate milestones like puberty or to be one of the oldest students graduating from high school.

“It’s worth considering there are trade-offs,” Kuhfeld advised. The conversation around redshirting is often presented as a straightforward decision with clear benefits, but she stressed that "There’s actually a lot of nuance here."

Ultimately, the decision of when a child starts school is a complex one, influenced by a multitude of factors unique to each family and child. While the allure of an academic head start is understandable, the latest research suggests that for the majority of children, the long-term academic dividends of delaying kindergarten may be less significant than commonly believed, prompting a more nuanced approach to this perennial parental dilemma.