School holidays 2025-26
- First day of school: Wednesday 3 Sep
- Autumn Break: Sat 18 Oct - Sun 26 Oct 2025
- Winter Break: From 13:00 on Thu 18 Dec 2025 - Mon 5 Jan 2026
- Spring Break: Sat 14 Feb - Sun 22 Feb 2026
- Easter: Mon 6 Apr 2026
- May Break: Sat 18 Apr - Tue 5 May 2026
- Ascension: Thu 14 May & Fri 15 May 2026
- Whitsun: Mon 25 May 2026
- Summer Holiday: Fri 17 Jul - Tue 1 Sep 2026
Staff study days 2025-26
On these days there is no school for students:
- Mon 6 Oct 2025
- Fri 21 Nov 2025
- Mon 5 Jan 2026
- Tue 24 Mar 2026
- Thu 11 Jun 2026
Remaining school holidays 2024-25
- Easter: Monday 21 April
- May Break: Tuesday 22 April - Monday 5 May
- Ascension: Thursday 29 and Friday 30 May
- Whitsun: Monday 9 June
- Summer Holiday: Friday 18 July - Tuesday 2 September
Remaining staff study days 2024-25
On these days there is no school for students:
- Tuesday 10 June 2025*
- Thursday 19 June 2025
* Only for primary
Exceptional leave
In accordance with the Dutch Compulsory Education Act (Leerplichtwet), leave outside of the school holidays is not allowed. Parents must plan holidays and special events during the official school holidays and in accordance with the school calendar. Exceptional leave can be granted only in very significant circumstances.
The local attendance authority (leerplicht) is responsible for parental compliance with the Dutch Compulsory Education Act and works with ISU in upholding the law. If parents decide to take leave without permission, it can mean parents will be contacted by the attendance authorities (leerplicht).This could also lead to legal proceedings and the imposition of a fine.
Contact secondary.admin@isutrecht.nl or primary.admin@isutrecht.nl should you want to enquire about exceptional leave.