Private & international schools in Oakville

Start with the division and the actual daily routine

Appleby College’s published sequence separates Middle School Grades 7–8, Upper School Grades 9–10 and Senior School Grades 11–12. St. Mildred’s-Lightbourn School (SMLS) is a girls’ school with Junior Kindergarten–Grade 5, Middle Grades 6–8 and Senior Grades 9–12 application routes. Those labels are not interchangeable: Appleby’s Upper School is an earlier pair of grades than SMLS’s four-year Senior School. Identify the exact grade and any siblings’ phases before comparing subject lists, or a family may accidentally assess two different points in secondary education.

The sites also shape a practical shortlist. Appleby publishes 540 Lakeshore Road West; SMLS gives 1080 Linbrook Road in Oakville. Visit the intended division and ask how the full school day works, including co-curricular commitments and collection. At Appleby, residential planning becomes a specific senior question: its Grade 11 page describes optional boarding, while the Grade 12 page states mandatory boarding. A family seeking a day-school arrangement throughout secondary education should discuss that final-year requirement at the start of the enquiry, rather than discover it after selecting senior subjects.

Sources: Appleby: accelerated grade sequence and Ontario/Appleby diplomas · SMLS: application phases and space-dependent timing · SMLS: girls’ senior Ontario programme and internship/AP enrichment · Appleby: day/boarding applications and mixed intake labels · Appleby: Grade 11 optional boarding · Appleby: Grade 12 mandatory boarding, own diploma and AP options

Build an individual Ontario and senior-study plan

Appleby describes Ontario secondary credits leading toward the Ontario Secondary School Diploma (OSSD), with additional academic and co-curricular requirements for its own Appleby Diploma. Its course page also explains accelerated sequencing: some Grade 8 work uses Grade 9 courses, and later pupils may take courses spanning more than one nominal grade. A transferring pupil therefore needs a transcript and prerequisite review, not a simple grade-number match. Ask which completed subjects receive credit, which compulsory components remain, and whether the desired combination can be scheduled; the school explicitly makes course offerings subject to enrolment and timetable constraints.

Both schools present AP opportunities, but the surrounding experience differs. Appleby’s Grade 12 page lists AP subjects within a broader senior programme and its additional diploma expectations. SMLS describes AP enrichment, a four-week professional internship in Grade 11, reach-ahead options and a culminating Grade 12 experience. Compare the student’s available time, existing preparation and the actual year’s course calendar before selecting a route. Ask how an internship or advanced subject fits required Ontario work and university prerequisites; a school’s enrichment description does not itself establish external credit or admission at a receiving university.

Sources: Appleby: accelerated grade sequence and Ontario/Appleby diplomas · Appleby: Grade 12 mandatory boarding, own diploma and AP options · SMLS: girls’ senior Ontario programme and internship/AP enrichment

Check language support and the intake-year checklist

Appleby’s application page separates day applications from rolling boarding applications for Grades 9–12. It requests school reports, a confidential school report and age evidence, with English-language assessment routes differentiated by grade for non-native speakers. Its displayed October–December 2026 application dates lead to decisions through February 2027, but the same page calls its Kira assessment Admissions 2026–27. Confirm the intended entry year and assigned checklist directly. Prepare full course records for the accelerated-sequence discussion and disclose assessments or accommodations early, so admissions and student services can assess the proposed programme.

SMLS’s Senior School instructions require records, family and student interviews, an English-and-mathematics diagnostic and other checklist items. They say the school currently has no ESL programme and expects independent English fluency for classroom participation; that is an SMLS-specific provision, not a general rule for Oakville schools. Its wider application page identifies priority windows and selective mid-year placements, all subject to availability. Ask whether the proposed receiving grade is open and whether the language and learning environment fits now, alongside the senior-course plan. Treat a submitted application or an assessment appointment as a step in review, not confirmation of placement.

Sources: Appleby: day/boarding applications and mixed intake labels · SMLS: Senior School language and diagnostic requirements · SMLS: application phases and space-dependent timing

Compare documented pathways and campuses

These are the pathways recorded for each included campus. Online provision appears separately. A senior qualification does not establish provision in younger years.

Parent questions about Oakville schools