In this guide
Two systems, two answers
Families often ask when applications open in Brussels expecting a single date, and the honest answer is that there is not one. The city's schools split into two systems with different admissions clocks, and the question only has a clear answer once you know which one you are applying to. The private international schools, the international schools in Brussels such as the International School of Brussels in Watermael-Boitsfort, the British School of Brussels in Tervuren and St John's International School in Waterloo, admit on a rolling basis, so applications are effectively always open. The four European Schools, by contrast, run a formal enrolment window that opens once a year for the main September intake. Pin down your track first and the timing becomes simple.
The private schools: rolling intake
The private international schools do not have an opening date because they admit through the year. You can start an application whenever your move firms up, and the school will place your child where the year group has space. The International School of Brussels accepts current-year applicants at most points up to around 1 May, after which the focus shifts to the following September. The practical implication is that timing is about your readiness and the year group's availability, not a calendar slot you must wait for. Because the most requested year groups fill first, the families who apply early in the autumn and winter get the widest choice, even though nothing technically closes. For the full step-by-step, see our guide to applying to international schools in Brussels.
The European Schools: a real window
The European Schools are the part of the Brussels market with an actual opening date. The network publishes an enrolment policy each year and opens a defined application window for the September intake, typically in the first months of the calendar year. Priority goes to children of staff of the European institutions, with other categories admitted where places remain. Because the dates and the document requirements are revised annually, the safest move is to watch the official Schola Europaea enrolment portal from January and file within the published window. Miss it, and you wait for the next year or fall back on the rolling private track. Our Brussels admissions deadlines 2026 page sets this out alongside the private timelines.
| Track | When applications open |
|---|---|
| Private international schools (ISB, BSB, St John's and others) | Rolling, effectively always open; current-year places generally up to about 1 May |
| European Schools (four Brussels campuses) | Formal enrolment window for the September intake, opening in the early months of the year; exact dates published annually |
Find out which track fits your family
The school finder shortlists Brussels schools by curriculum, district and stage, so you know which admissions clock applies before you start.
Use the school finderThe best months to apply for 2026
For a late August or early September 2026 start, the workable window runs from the autumn of 2025 through to the spring of 2026. Enquire and visit in the autumn and winter, which is also when most Brussels open mornings run, as our Brussels open days 2026 page explains. Watch the European School portal from January if that track applies. Have your complete private-school file, with reports and the teacher reference, in by the spring; the International School of Brussels works to an approximate 1 May edge for current-year entry. The local year ends on Friday 3 July 2026 and restarts in late August, so July and August are quiet for admissions. Acting earlier in this window does not just meet a deadline, it widens your genuine choice of school and year group.
Frequently asked questions
When do international school applications open in Brussels?
It depends on the track. The private international schools, such as the International School of Brussels, accept applications on a rolling basis all year, so there is no opening date as such; you apply when you are ready, ideally the autumn before a September start. The European Schools open a formal enrolment window for the September intake in the early months of the calendar year, with the exact dates published annually in their enrolment policy.
What is the best month to apply to a Brussels school?
For a September start, the autumn and winter before are ideal, roughly September to February, which gives time to visit, file documents and secure a place before the popular year groups fill. The International School of Brussels takes current-year applicants up to around 1 May, but earlier is better. Watch the European School portal from January if that track applies to you.
Can I apply to a Brussels school mid-year?
Often yes at the private international schools, which admit students through the year where the year group has space. The International School of Brussels generally accepts current-year entries up to about 1 May. The European Schools are geared to the September intake, so a mid-year place there depends on availability. Confirm the specific year group with the school.
Do Brussels schools have a waiting list?
Popular year groups at the sought-after private schools can run a waiting list, and the European Schools allocate within priority categories, so demand can exceed places in some years and stages. An early, complete application is the best protection. Ask each shortlisted school directly whether your child's year group is open or waitlisted before you file.