Students don't leave school in June and immediately forget everything. The forgetting happens slowly, across weeks of no math practice, no structured reading, and no writing, until September arrives and the gap has quietly grown wider than most parents expect.
Summer learning loss is the measurable decline in academic skills that happens when children are not actively learning for an extended period. It is sometimes called the summer slide, and it is one of the most consistently documented patterns in education research. The question is not whether it happens. Research shows that it does, reliably, across subjects, grades, and countries. The more useful questions for parents are which subjects take the biggest hit, which children are most at risk, and what you can actually do before September arrives.
What the Research Actually Shows
Every September, teachers across Ontario factor review time into their plans before introducing new material. That time is not just good practice. It is a response to something measurable: children return knowing less than they did in June. Foundational research by education scholar Harris Cooper and colleagues found that students lose at least one month of learning on average over the summer break, with math, especially computation, typically showing the steepest decline. That finding has been replicated across multiple studies over the past three decades. The explanation is straightforward: reading happens informally, through books, signs, and screens, even when school is out. Math does not. Without deliberate practice, procedural fluency in arithmetic, fractions, and problem-solving fades quickly. More recent analysis from the Northwest Evaluation Association (NWEA), drawing on its MAP Growth assessments of millions of students across North America, has continued to find that summer drops in math remain larger than reading and that the gap is widest for students from lower-income communities. Ontario's own provincial assessment data echoes the pattern: EQAO's 2025 results showed that 49 percent of Grade 6 students and 42 percent of Grade 9 students were not meeting the provincial standard in math (48 and 41 percent in the 2025-2026 results released in September 2026), and a long summer without practice widens, rather than narrows, that gap.
Does Summer Hurt Math More Than Reading?
Math takes the largest losses, especially math facts and computation, the skills most likely to fade without practice. Reading is more resilient, but comprehension and vocabulary growth slow significantly compared to the school year. Writing, which depends on feedback and practice, also declines noticeably. The subjects most tied to procedural repetition (math, spelling, grammar mechanics) show the steepest drops. The ones most tied to exposure (oral vocabulary, general knowledge) show smaller but still real gaps when a child goes from rich school environments to a summer with less structured language use.
Not Every Child Loses the Same Amount
Summer learning loss is not evenly distributed. Children from higher-income households often maintain or even gain ground during summer, because they have access to enrichment activities, books, travel, and learning-oriented environments. Children from lower-income households, on average, lose more ground, because those resources are less available. This gap compounds year over year. Cooper's meta-analysis found the effect was strongest for reading among students from lower-income families, and the pattern is intuitive: children with steady access to books, enrichment, and structured learning over the summer hold their ground, while those without those resources fall further behind each year.
Signs to Watch for When September Arrives
Parents often notice the effects before teachers name them. Common signs include a child who was confident with multiplication in June now needing to count on their fingers, a student who was reading chapter books in May now avoiding longer texts, or a Grade 7 student who has forgotten how to work with fractions before algebra begins. If the June report card already flagged a soft spot in math or reading (here is a parent guide to understanding Ontario report cards), summer is the right time to act on it, not September. These are not signs that a child is falling behind permanently. They are signs that the summer gap is real and that a focused start to the year will matter.
The transition years are where summer loss tends to have the largest downstream effect: Grade 3 (when EQAO assessments begin), Grade 6 (EQAO cycle and the move toward secondary prep), and Grade 9 (the shift to destreamed math and formal credit-based courses). If your child is entering one of these years, a structured summer review is more than a nice-to-have.
How to Prevent Summer Learning Loss in Ontario
The most effective interventions are short, consistent, and matched to what the child was actually working on. Reading for at least 20 minutes a day (ideally books the child chose) keeps decoding and comprehension active; structured literacy approaches are particularly effective for children who are still building fluency. Practicing math facts with short exercises several times a week, and having conversations about science or history topics, all help. Structured tutoring sessions during summer, even a small number, meaningfully reduce the back-to-school review period and make the transition back to school in September noticeably smoother. The key is the word structured: a certified teacher who knows the Ontario curriculum can identify exactly where a child's gaps are and work on those specifically, rather than reviewing everything from scratch.
Unstructured exposure to math (apps, worksheets bought at random) tends to be less effective than targeted sessions because it does not follow the child's actual curriculum or address the gaps that formed during the year. A free 15-minute assessment with a certified teacher is the fastest way to know where to focus before summer ends; if you are weighing the budget side first, here is a plain-English look at how much tutoring costs in Canada.
How Connect Education Can Help
Connect Education works exclusively with licensed teachers. Every student starts with a personalized one-on-one learning plan built by a certified teacher, matched to your provincial curriculum and to your child's specific gaps. Sessions are available online, in person, or at a public library, on a flexible schedule that fits around summer plans. There is no rigid term commitment, and the focus is always on the real gaps, not a generic review of everything.
Whether your child needs math practice before Grade 4, reading support before Grade 7, or a structured review before any major school transition, a certified teacher will build the plan from your child's actual starting point. Browse available teachers at connect-education.com/tutors or start with a free assessment at connect-education.com/free-assessment-form.