Is French Immersion Worth It? What the Evidence Says
Category: Insights
French immersion does the thing it is built to do. Half of the children and adults who have spent at least a year in French immersion can hold a conversation in French. Among people who were never in immersion, about four in a hundred can. Statistics Canada puts those two numbers beside each other, and the distance between them is the honest case for the program.
Now the other half of the truth. In Ontario, fewer than half of the students who start immersion in Grade 1 are still in it by Grade 12. So is French immersion worth it? Not as a yes or a no. It is a trade with knowable terms. A French immersion program teaches ordinary school subjects like math, science and social studies in French rather than teaching French as one class in the day. What follows is what the evidence supports, what it does not, and what has to be true for the trade to be a good one for your child.
What French Immersion Actually Asks of a Family
Immersion is not a French class. It is a decision to teach a child ordinary school subjects in a language they do not speak yet, typically in a family that does not speak it at home either. Everything attractive about the program and everything hard about it comes from that one design choice.
Learning a Language by Using It, Not by Studying It
In immersion, math, science and social studies are the vehicle. The child is not studying French at nine in the morning and then moving on to the real work. They are counting, sorting, arguing about a story and finding out why rivers flood, all of it in French. The language gets learned the way a first language does, by being used for something that matters more than it does.
That design has a flip side, and it is concrete. What a child can show you about what they know is bounded by what they can say in French, not by what they understand. A seven-year-old with a sophisticated idea about the flooded river may hand you three words. That one constraint sits underneath almost every worry a parent has about this program.
The Size of the Commitment in Ontario
Ontario sets the floor. A French immersion program must deliver at least 3,800 hours of instruction in French by the end of Grade 8, with at least half of all instruction at every grade level given in French. Finishing the program at the secondary level takes ten credits: four French immersion language courses, plus at least six other subjects taught in French.
In York Region’s public system, elementary immersion begins in Grade 1 and placement follows a designated attendance area. Whatever the setting, the hours are the commitment. A child spends the better part of their elementary schooling working in a second language, and a family signs on to that when the child is five or six, long before there is anything to show for it.
The Level of French Your Child Will Actually Reach
This is where expectations get set, and where a great deal of disappointment gets manufactured in advance. The research describes a specific shape of outcome at the end of the program, not a single mark on a report card. A parent who knows that shape going in will recognize a good result when it arrives.
Strong Listening and Reading
Decades of Canadian research report the same finding: immersion students often perform as well as native French-speaking students on tests of reading and listening comprehension in French. Not close to. As well as. This is the part of the outcome that genuinely surprises people, partly because it is the part nobody thinks to promise.
There is a nuance worth holding onto. Immersion students tend to read a French text at native-speaker level for the gist, then lose ground on questions about the details. The comprehension is real and it is broad. The precision is thinner. For a child from an English-speaking household, it is still a remarkable place to land.
Confident Speaking, but Not Native Speaking
The same body of research finds that immersion students seldom reach native-speaker levels in speaking and writing. Their French works. It carries them through a conversation without hesitation. It is also simpler in its grammar than a native speaker’s, it borrows English patterns, and it is often not quite idiomatic. The classic example is a child saying “Je cherche pour mon stylo”, an English sentence wearing French clothes, where a francophone would say “Je cherche mon stylo”.
Here is the conclusion a parent needs early. A graduate of a strong immersion program is a confident, effective French speaker and not a francophone. Those are two different things, both worth having, and a parent expecting the second will feel let down by a genuinely excellent outcome.
How Much of It Survives Adulthood
French does not maintain itself. Among former immersion participants, the share who can still hold a conversation in French slides with age: about 56 percent of those aged 18 to 24, about 49 percent of those aged 25 to 44, and about 48 percent of those aged 45 to 60. Most of that drop happens between the early twenties and middle age.
The counterweight is real too. Across a twenty-year stretch, the share of English-speaking children aged 5 to 14 outside Quebec who could hold a conversation in both official languages climbed from under nine percent to over eleven, and the growth of immersion is part of why. Immersion produces bilingual children reliably and bilingual adults less reliably. The skill needs use.
What Happens to English and to the Other Subjects
Parents ask this question first, and it deserves a straight answer. There is a real gap on English measures during the years before English is taught. It is a predictable result of not having been taught English yet, and the research is clear about when it opens and when it closes. The useful answer runs on a calendar.
When English Starts, and How Long the Gap Lasts
In many Ontario immersion programs that begin in Grade 1, children are taught entirely in French until Grade 3 or 4, when English is introduced. Ontario’s curriculum for French as a second language describes that pattern. English then widens to more subjects, and by the end of Grade 8 it can take as much as half the school day, which is the same half-in-French rule the program started with, seen from the other end.
During the grades when no English is taught, immersion students score below grade level on English word knowledge and reading comprehension. Parity usually arrives within one or two years of English instruction starting. The national association of immersion teachers tells parents the same: early differences generally disappear within a year of English beginning, and immersion students end up matching English-program students in reading, writing, speaking and listening in English.
Boards set their own timing, so ask any school you are considering which grade English starts in and how much of the day it takes up by Grade 8.
What an Analysis of Ontario’s Test Results Found, Including the Part the Researchers Flagged
Ontario’s province-wide testing has been studied for exactly this question. A long-standing analysis of those results confirmed that any lag in immersion students’ reading, writing and math has disappeared by Grade 6.
The researchers who did that work put forward two explanations and declined to choose between them. One is that the lag simply closes, which is what the rest of the evidence predicts. The other is that the Grade 6 group is a more select set of students than the Grade 1 group was, because of who has left the program in between. The second explanation is the reason to read any immersion result carefully rather than triumphantly.
Immersion students also write those provincial assessments under several different options, so the public results do not hand you a clean side-by-side of immersion and English-stream performance.
Math and the Subjects Taught in French
Math sits inside that same Grade 6 finding. The worry is that a child cannot reason through a word problem in a language they are still building. The province-wide result says that worry does not survive to Grade 6.
The research on immersion also finds something that reframes the question. A child who struggles with a school subject in French is likely to struggle with that subject in English too. The French is rarely the cause. It is the thing the cause is wearing.
There is one real difference, though, and it is about access to help. A child who cannot yet ask a question in French cannot flag confusion the way an English-stream child can. That puts more weight on class size, on how closely an adult is watching, and on whether anyone notices a quiet child going under.
Who Leaves, and When
French immersion in Ontario grew steadily for about fifteen years and has levelled off since it peaked just before the pandemic. Enrolment is the easy number, and not the one that decides anything. The harder number is how many of the children who start are still there at the end.
Fewer Than Half Finish
In Ontario, 40.8 percent of a Grade 1 French immersion cohort was still in the program in Grade 12. That is 9,131 Grade 12 immersion students, from a Grade 1 cohort of 22,361 eleven years earlier, as reported by Canadian Parents for French.
Read the other way, roughly three in five Ontario students who start immersion do not finish it. That is not a scandal and it is not a secret. It is the base rate, and any honest answer to whether immersion is worth it has to account for it. These retention figures are reported for Ontario as a whole rather than region by region, so treat them as the provincial pattern York Region sits inside.
Why Families Leave
What gets published is how many students finish. Why the others left is not collected as a national count anywhere.
Families who move a child out commonly describe the same few pressures. A reading difficulty that is hard to support in a second language. A narrower course list once high school arrives. And the plain sense that the effort has stopped paying for itself.
Departures cluster at the transition points, and immersion is front-loaded: the years when the commitment is heaviest are the years when the payoff is least visible. A family weighing this in Grade 3 is weighing it at the hardest point on the curve, often shortly before the thing they were waiting for turns up.
Switching to English Is Not a Reliable Fix
This finding runs hard against instinct. A review of the research found that below-average students in immersion scored at the same level as below-average students in the English program, on both English language tests and academic achievement tests. The same results, plus French.
That review also found few cases of unqualified success when a struggling child was moved into the English stream. And it made a sharp point about the reports claiming immersion is unsuitable for weaker students: those reports never established that the students were below average, only that they were having difficulty.
So the question in front of a struggling family is not French or English. It is whether the child is getting the right support, in either one.
Where French Actually Opens Doors After School
The career case for French gets stretched in both directions. It is sold as a passport and dismissed as a party trick, and the accurate version sits between the two. It is a story about access to particular kinds of work, not a story about income.
Using French at Work Is the Exception, Not the Rule
About one in ten adults who were in French immersion as children use French at work, roughly 72,000 workers nationally. Ontario runs above that national figure at 12.8 percent, which is worth knowing for a York Region family. It still means about one worker in eight. That is only a let-down if you were promised French is a career accelerator.
Draw the honest conclusion from it. For most graduates, immersion is not primarily a workplace skill, and a parent choosing it mainly as a career move is choosing it for the least likely of its benefits. There are stronger reasons to choose it than that one.
The Real Payoff Is Access, Not a Pay Cheque
Where French does open doors, it opens specific ones. About four in ten positions in the federal core public administration that serve the public are bilingual positions. That is the federal public service, not the job market at large, and the distinction matters: in some places French is a requirement, and elsewhere it is a nice line on a resume.
Beyond the federal government, French opens work in health care, law, education and international organizations that stays closed without it. Bilingual workers outside Quebec earn modestly more on average, and the gap is small enough that it should not be the reason you choose a school.
The Brain Benefits: What the Research Supports and What It Does Not
Much of what a parent reads about immersion is about the French. Some of it is about the brain, and that part is considerably shakier than the marketing suggests. The useful sorting is between what is true and what is not about French immersion and what has simply been repeated often enough to sound settled.
The Brain Benefits You Have Probably Read About
The big claim is that bilingualism improves executive function: attention, switching between tasks, holding several things in working memory at once. A large review pooled 891 effect sizes from 152 studies of adults. Before correcting for publication bias, it showed small advantages on inhibition, shifting and working memory. After correcting for publication bias, no evidence of a bilingual advantage remained.
There is a reason the discouraging half rarely reaches a parent. Studies that found a bilingual advantage were published more often than studies that did not, and the difference was not explained by sample size, by the tests used, or by statistical power. The finding that travelled is the finding that got printed.
Where Immersion Children Did Score Higher: One Toronto Study
One study is worth reporting alongside its size. It looked at 124 children from English-speaking Toronto families, half in French immersion and half in English programs. The immersion children did better on tasks about how words are built, and by Grade 5 on judging sentences that were grammatically correct but made no sense. That is a genuine finding about awareness of how language works.
The other half of the result matters too. On a timed task that asked children to produce as many words as they could, the immersion children showed no advantage, and the younger ones produced fewer words than their peers. One study of 124 children is a promising finding, not a body of research. The reliable benefit of immersion is the French.
The same evidence that makes the strong case for immersion is the evidence that draws its limits. Families tend to arrive having read only the first half of it, which is why a perfectly good outcome can land as a shortfall.
| What the evidence supports | What it does not support |
| Listening and reading French at close to native-speaker level | Speaking and writing French like a native speaker |
| A far higher chance of conversational French than any English-stream path | That the French maintains itself without use after school ends |
| English reading and writing catching up within a year or two of English instruction starting | That there is no English gap at all in the years before English is taught |
| Better awareness of how language works, in one study of immersion children in Toronto | A general boost to memory, attention or executive function |
| Real access to bilingual roles, concentrated in the federal public service | A reliable income premium you can plan a family budget around |
What Has to Be True for French Immersion to Be Worth It for Your Child
The evidence answers “does immersion work” far better than it answers “will it work for us”. That second question comes down to conditions you can check in advance. It sits next to the broader matter of how families here weigh public and private options, which is its own decision and not this one.
Ontario’s Policy Says Immersion Is for Every Student
Ontario’s policy is explicit. French as a second language programs are for all students, and participation should reflect the diversity of the student population, including students with special education needs and English language learners. That is the policy position, stated plainly.
It matters because immersion gets treated informally as a talent test. The research does not license screening children for it. What a policy says and what a given program does are different things, so ask a school directly how it decides who is a good fit, and what it does with a child finding the work hard.
The Support Has to Actually Exist, in the Right Language
Dyslexia Canada advises that many children who struggle with reading in French immersion can still succeed with the right supports, and that switching to English does not automatically mean a child will do better. It calls for early screening in Kindergarten to Grade 2, evidence-based structured literacy instruction, and accommodations.
Put that screening window against the calendar. Kindergarten to Grade 2 sits before English arrives in a program that starts in Grade 1, so a reading difficulty will show itself in French first. A school that waits for English to reveal it has waited years longer than it had to.
A child’s French comes from the classroom, not from the kitchen table, and what matters at home is the reading, the routine and the interest, in whatever language you speak. Knowing what helps at home when you do not speak French is a smaller job than it sounds.
Continuity Through the Transitions
Departures cluster at the transition points, which makes continuity one of the few variables a family genuinely controls. Every handover is a moment when the approach changes, the expectations change and the adults change, all at once, and every one of them is a place where a family reconsiders.
So look for a program that carries one approach from the early years through Grade 8 without a break in the middle. The same method, the same standards, and adults who already know the child. A child who keeps all of that through the years when the payoff is still invisible is a child who is still there when it arrives.
Two Immersion Programs Are Not Interchangeable
French teacher supply, recruitment and retention was identified as an emerging issue by the Ontario College of Teachers in 2015, and school boards report that finding occasional teachers with French qualifications is difficult. That is a long-standing condition of the system, and it is one reason two programs carrying the same label can deliver two different experiences.
So ask the questions that tell them apart. How does a struggling reader get help here, and in which language is that help delivered. How much individual attention does a child get before they are able to ask for it themselves. And what happens at each transition point, in practical terms, for a child who is finding that particular year hard.
Seeing an Immersion Classroom Before You Decide
Those conditions are visible in a classroom in twenty minutes and invisible on a website. Watch how a child who is stuck gets unstuck. Count the adults in the room. Notice what happens when a child cannot find the French word: whether they are handed it, waited for, or quietly passed over.
La Maison Montessori House is a French immersion private school serving York Region families, with classrooms small enough that a child gets individual attention before they know how to ask for it. Our Montessori-inspired private French immersion program runs from Pre JK to SK through elementary under one continuous approach, with no handover in the middle.
If that is what you are trying to judge, get in touch about a visit and watch an ordinary Tuesday morning rather than a showcase.
Frequently Asked Questions
Strong understanding and workable production. Immersion students often listen and read French at a level that matches native French-speaking peers, which is the half parents underestimate. Speaking and writing land differently: confident, effective and genuinely useful, while staying recognizably non-native, with simpler grammar and some English patterns underneath. That is the expected outcome of a strong program, not a shortfall in one.
No. Boards choose their own start grades, and Ontario’s binding requirements are about how much French a program delivers, not about when English begins. The common pattern in programs that start in Grade 1 is English arriving in Grade 3 or 4. Because it varies, ask the specific school which grade English starts in and how much of the day it takes up by Grade 8.
Often yes, when the supports are real. The recommended package is early screening in Kindergarten to Grade 2, evidence-based structured literacy instruction and accommodations, alongside the caution that switching to English does not automatically mean a child will do better. The research agrees: below-average students in immersion performed at the same level as below-average students in the English program. Judge the help, not the language it is delivered in.
Three questions separate them. Is the difficulty in one subject or across the whole day. Did it start with something the child can name, like a new teacher, a new school, or English arriving in the timetable. And has the school put a real support plan in place that someone can describe to you in specifics. A rough patch has a cause and a plan. A bad fit has neither. Changing streams is not itself the intervention.
No. The bilingual advantage in executive function did not survive correction for publication bias in a large review of adult studies, and studies finding an advantage were published more often than studies that did not, which is why the encouraging version is the one in circulation. What does hold up is narrower: in one study of immersion children, they showed better awareness of how language itself works. The reliable benefit of immersion is the French.
Not in the way the headline suggests. In the research, bilingual people tended to notice Alzheimer’s symptoms a few years later than people who spoke one language, and were diagnosed with dementia a few years later as well. They were not less likely to develop dementia. The researchers also warned that studies in this area measure how much people actually use each language poorly. Treat it as an open question, not a reason to enroll.
In specific fields, yes. Ontario runs above the national average for former immersion students using French at work, at 12.8 percent, so roughly one in eight. The clearest concentration is the federal public service, where about four in ten positions serving the public are bilingual ones. French also opens work in health care, law, education and international organizations. Think of it as access to particular employers rather than as a raise.