Every school has a number of INSET (In Service Educational Training) days per year. These days are for staff training and are important for the development of teaching methods.
The decision on the dates of inset days is made by the individual head teacher and governing body of that school. Any queries should, therefore, be directed to the individual schools.
View details of school inset days below:
Abercynon Community Primary School
Aberdare Community School
Aberdare Park Primary School
Aberdare Town C in W Primary
Blaengwawr Primary School
Bryncelynnog Comprehensive School
Cardinal Newman RC Comprehensive School
Coedpenmaen Primary School
Craig Yr Hesg Primary School
Cwmbach C in W Primary School
Cwmclydach Community Primary School
Darran Park Primary School
Glenboi Community Primary School
Gwauncelyn Primary School
Gwaunmeisgyn Primary School
Hendreforgan Primary School
Llanharan Primary School
Monday 05 January 2026
School closed to pupils.
Llanilltud Faerdref Primary School
Friday 24 October 2025
School closed for pupils
Friday 19 December 2025
School closed fopr pupils
Friday 17 July 2026
School closed for pupils
Monday 20 July 2026
School closed for pupils
Llantrisant Primary School
Llwyncrwn Primary School
Monday 23 February 2026
School closed for all pupils
Maerdy Community Primary School
Maesycoed Primary School
Friday 24 October 2025
School closed to pupils
Monday 05 January 2026
School closed to pupils
Friday 27 March 2026
School closed to pupils
Friday 17 July 2026
School closed to pupils
Monday 20 July 2026
School closed to pupils
Mountain Ash Comprehensive School
Parc Lewis Primary School
Friday 19 December 2025
INSET Day
Monday 23 February 2026
INSET Day
Friday 22 May 2026
INSET Day
Monday 20 July 2026
INSET Day
Pengeulan Primary School
Friday 27 March 2026
School Inset Day
Penpych Primary School
Friday 30 January 2026
Treorchy Cluster Inset Day
Penrhiwceibr Primary School
Friday 24 October 2025
For Cluster Teacher Training and Learning Support Assistant Professional Development
Penrhys Primary School
Friday 03 October 2025
School will be closed for all children.
Mr. Williams- Headteacher
Monday 20 July 2026
School will be closed for all staff and children.
Mr. Williams- Hedateacher
Penyrenglyn Community Primary School
Friday 19 December 2025
School closed for all pupils
Perthcelyn Community Primary School
Monday 03 November 2025
School Closed to Pupils
Pontyclun Primary School
Friday 14 November 2025
staff training
Monday 05 January 2026
staff training
Friday 27 March 2026
staff training
Friday 22 May 2026
staff training
Monday 20 July 2026
staff training
Pontygwaith Primary School
SS Gabriel & Raphael RC Primary School
Friday 10 October 2025
RE INSET DAY -ALL STAFF
St John Baptist C in W High School
St Michael's RC Primary School
Ton Pentre Junior School
Monday 20 July 2026
INSET Day - Only staff to attend.
Tonysguboriau Primary School
Tref Y Rhyg Primary School
Treorchy Comprehensive School
Trerobart Primary School
Friday 24 October 2025
School closed for pupils
Friday 19 December 2025
School closed for pupils
Monday 13 April 2026
School closed for pupils
Monday 20 July 2026
School closed for pupils
Williamstown Primary School
Monday 05 January 2026
INSET day - closed to all pupils
Y Pant Comprehensive School
Ynyshir Community Primary School
Monday 05 January 2026
Inset day for staff training.
Ysgol Gyfun Cwm Rhondda
Monday 10 November 2025
Diwrnod HMS - Ysgol ar gau i ddisgyblion
INSET Day - School closed to pupils
Friday 19 December 2025
Diwrnod HMS - Ysgol ar gau i ddisgyblion INSET Day - School closed to pupils
Friday 13 February 2026
Diwrnod HMS - Ysgol ar gau i ddisgyblion INSET Day - School closed to pupils
Friday 27 March 2026
Diwrnod HMS - Ysgol ar gau i ddisgyblion INSET Day - School closed to pupils
Monday 20 July 2026
Diwrnod HMS - Ysgol ar gau i ddisgyblion INSET Day - School closed to pupils
Ysgol Gynradd Gymraeg Abercynon
Friday 24 October 2025
INSET Training Day
Monday 05 January 2026
INSET Training Days
Tuesday 06 January 2026
INSET Training Days
Ysgol Gynradd Gymraeg Aberdar
Monday 05 January 2026
Review of School Development Plan
Ysgol Gynradd Gymraeg Awel Taf
Friday 24 October 2025
Trauma Informed
Monday 03 November 2025
HMS: Rhifedd/ INSET Numeracy
Ysgol Gynradd Gymraeg Bronllwyn
Monday 05 January 2026
Diwrnod HMS i`r staff
INSET Day for staff
Ysgol Gynradd Gymraeg Castellau
Monday 03 November 2025
Diwrnod HMS - dim ysgol i'r plant
INSET Day - no school for pupils
Ysgol Gynradd Gymraeg Evan James
Ysgol Gynradd Gymraeg Llwyncelyn
Ysgol Gynradd Gymraeg Llyn Y Forwyn
Ysgol Gynradd Gymraeg Ynyswen
Ysgol Gynradd Gymunedol Gymraeg Llantrisant