Boarding schools accept students aged 9 to 19. In the US, most schools serve ages 14–18 (grades 9–12), junior boarding schools serve 9–15 (grades 4–9), and postgraduate years extend to 19. UK schools accept boarders from age 7, with standard entry at 11, 13, and 16.
Key facts about boarding school ages
- Grade 9 (age 14) is the largest entry point at US boarding schools.
- Only about a dozen US junior boarding schools accept students below grade 6.
- UK boarding legally begins at age 7; standard intakes are 7+, 11+, 13+, and 16+.
- Postgraduate (PG) years serve 18–19-year-olds after high school graduation.
- Swiss international schools accept the widest range, some from age 8 through 19.
Boarding school entry ages by country and type
Entry ages vary by country and school type more than by individual school. The table summarizes standard intakes for 2026.
| School type | Ages | Grades | Notes |
|---|---|---|---|
| US college-prep boarding | 14–18 | 9–12 | Grade 9 is the main intake; 10 and 11 also common |
| US junior boarding | 9–15 | 4–9 | ~12 schools; see junior boarding guide |
| US postgraduate (PG) year | 18–19 | 13th year | See the PG year |
| UK prep boarding | 7–13 | Years 3–8 | Full boarding under 11 now uncommon |
| UK senior boarding | 11–18 | Years 7–13 | Main intakes at 11+, 13+, 16+ (sixth form) |
| Swiss international | 8–19 | Varies | Widest range; see Swiss schools |
| Therapeutic boarding | 12–18 | 6–12 | Clinical admission criteria, not grade-based |
What is the best age to start?
Age 14 (grade 9) is the best-supported starting age at US schools: the largest number of open spots, full orientation programming, four years to build college credentials, and the typical developmental point where teens can manage independent living. Younger entry suits mainly relocating or expatriate families.
For younger children, see boarding schools for middle schoolers; for readiness beyond age, use the 12-question checklist.
Is there a maximum age for boarding school?
Yes, effectively 19. US boarding schools generally will not enroll students who turn 20 during the school year, including postgraduates. Athletic leagues enforce age eligibility caps, and visa categories for international students assume secondary-school age ranges.
Ages FAQ
What is the minimum age for boarding school?
In the US, the practical minimum is age 9–10 (grade 4) at roughly a dozen junior boarding schools. In the UK, prep schools legally accept boarders from age 7, though full boarding under 11 has become rare. No mainstream US boarding school takes children younger than grade 4.
What is the best age to start boarding school?
Age 14, entering grade 9, is the most common and generally best-supported starting point: schools reserve most beds and orientation resources for 9th graders, students get four full years, and adolescent readiness for independent living typically emerges around this age.
Can a 5-year-old go to boarding school?
Effectively no. No mainstream US or UK boarding school enrolls 5-year-old boarders; UK schools begin boarding at 7 by longstanding convention, and US junior schools start around 9–10. Child development professionals broadly advise against boarding at early primary ages.
Is 16 too late to start boarding school?
No. Grade 11 entry is offered at most US schools, and UK sixth-form entry at 16 is a standard intake point. Late entrants get less time to integrate, but schools admit for grades 10, 11, and even 12, plus postgraduate years at 18–19.
Sources
- The Association of Boarding Schools (TABS): US school types and grade ranges.
- Independent Schools Council (ISC): UK boarding ages and intake points.