School holidays & extraordinary leave

At ISU we follow the Dutch school holidays.

There are strict guidelines for granting permission for extra leave outside the 12-week holiday period. Throughout the school year there are a number of professional development days for staff. On these days the school is closed. Students who normally go the after school care (BSO) will be welcome at the BSO all day on study days.


School holidays 2022-2023

  • Whitsun/Pinksteren: Monday 29 May
  • Staff study day: Tuesday 30 May
  • Last day of school: Thursday 6 July; school ends at 12:00.
  • First day of the Summer Holidays: Friday 7 July

School holidays 2023-2024

  • First Day of Term: Thursday 24 August*
  • Autumn Break: Saturday 14 - Sunday 22 October
  • Winter Break: Thursday 21 December 12:00 - Sunday 7 January
  • Spring Break: Saturday 17 February - Sunday 25 February
  • Easter Weekend: Friday 29 March - Monday 1 April
  • May Break: Saturday 27 April - Sunday 12 May (including Ascension/Hemelvaart)
  • Whitsun/Pinksteren: Monday 20 May
  • Summer Holiday: Friday 12 July - Tuesday 27 August

* On Wednesday 23 August from 15:30 all school families are invited to the official opening of the new campus.

Professional development days for staff

  • Monday 25 September
  • Friday 24 November
  • Wednesday 13 December - Only primary
  • Monday 8 January
  • Thursday 28 March
  • Tuesday 21 May
  • Wednesday 19 June

Please note that there are no classes on the professional development days for staff.

Extraordinary leave

There are strict guidelines that need to be adhered to and only for very significant circumstances is the Head of School able to grant permission for leave outside the 12-week holiday period. Should you need to apply for extraordinary leave, collect and submit a ‘request for extraordinary leave form’ from the school office. Please be aware the request should be made at least 4 weeks in advance of the requested dates.