School Calendar
Activities, celebrations, breaks, trips, and more — everything your child will experience throughout the school year.
Year at a Glance
Key dates across the 2025–2026 academic year.
Thematic Weeks
13–17 Oct
Music and Art – Who We Are
22–24 Dec
Christmas Week
23–27 Feb
Career Week
27 Apr–1 May
Charity Week – Sharing the Planet
Break Weeks
20–24 Oct
Fall Holiday
29 Dec–2 Jan
Christmas Holiday
2–6 Mar
Spring Holiday
4–8 May
May Holiday
13 Jul–30 Aug
Summer Break / Camp (7 weeks)
School Closed
3 Oct
Leiden Ontzet
25–26 Dec
Christmas
1 Jan
New Year's Day
6 Apr
Easter Monday
27 Apr
King's Day
5 May
Liberation Day
14 May
Ascension Day
25 May
Whit Monday
Parent-Teacher Meetings
7–9 Jan
Parent-Teacher Meetings
9–10 Jul
Parent-Teacher Meetings
26–28 Aug
Staff Preparation (staff only)
Term Events
Click a term to expand its full event list.
18 Aug
First Day of School Celebration
18–29 Aug
Orientation Weeks
5 Sep
Picture Day
8 Sep
Math Activities – Arithmetic Ninja
25 Sep
Mayor Visit
26 Sep
International Day
29 Sep
NPO Classic Visit / TISA Heroes Math
1 Oct
International Music Day & Concert
4–12 Oct
Space Days
6–10 Oct
Assessment Week
30 Oct
Opera Visit (Grades 3, 4/5)
31 Oct
Halloween
Summer Camp
By grade group
Grade 0
- 13–24 JulWeeks 1–2 · Fun Science
- 27 Jul–7 AugWeeks 3–4 · Theatre & Music
- 10–21 AugWeeks 5–6 · Puppet Show
Grades 1–2
- 13–24 JulWeeks 1–2 · Robotics & Space
- 27–31 JulWeek 3 · Graphic Design
- 3–7 AugWeek 4 · 3D Modeling
- 10–14 AugWeek 5 · Create a Cartoon
- 17–21 AugWeek 6 · Dutch Masters
Grades 3–8
- 13–24 JulWeeks 1–2 · Robotics & Space
- 27 Jul–7 AugWeeks 3–4 · Animation Pixar
- 10–14 AugWeek 5 · Dutch Masters
- 17–21 AugWeek 6 · Archeological Expedition
- 24–25 AugCamping Trip
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