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
Monday 20 July 2026
school will be closed to pupils for staff training
Aberdare Community School
Aberdare Park Primary School
Monday 01 June 2026
School will be closed to learners
Friday 17 July 2026
School will be closed to learners
Monday 20 July 2026
School will be closed to learners
Aberdare Town C in W Primary
Friday 13 February 2026
Staff Training INSET
Blaengwawr Primary School
Bodringallt Primary School
Monday 26 January 2026
DCF Cluster Collab
Bryncelynnog Comprehensive School
Cardinal Newman RC Comprehensive School
Cefn Primary School
Thursday 07 May 2026
INSET Day closed to all pupils
Coedpenmaen Primary School
Craig Yr Hesg Primary School
Thursday 07 May 2026
INSET Day- Closed to all pupils
School will be open as a Polling Station
Cwmaman Primary School
Monday 13 April 2026
Inset Day
Cwmbach C in W Primary School
Thursday 07 May 2026
INSET DAY
Monday 20 July 2026
INSET DAY
Cwmbach Community Primary School
Thursday 07 May 2026
School with be closed for Inset Day
Monday 01 June 2026
School will be closed for Inset day
Monday 20 July 2026
School will be closed for Inset day
Cwmclydach Community Primary School
Cwmdar Primary School
Monday 20 July 2026
INSET DAY
Darrenlas Primary School
Thursday 07 May 2026
Inset Day - School Closed for Senedd Elections
Monday 20 July 2026
Inset Day
Ferndale Community School
Monday 09 March 2026
INSET DAY - No school for pupils
Monday 20 July 2026
INSET DAY FOR ALL SCHOOLS
Gelli Primary School
Monday 26 January 2026
INSET day school will be closed to all pupils
Glenboi Community Primary School
Gwauncelyn Primary School
Friday 13 February 2026
Staff training related to Curriculum for Wales and Teaching and Learning
Friday 19 June 2026
Self Evaluation activities
Gwaunmeisgyn Primary School
Monday 13 April 2026
Inset Day
Monday 20 July 2026
Inset Day
Hendreforgan Primary School
Llanilltud Faerdref Primary School
Friday 17 July 2026
School closed for pupils
Monday 20 July 2026
School closed for pupils
Llantrisant Primary School
Friday 13 February 2026
INSET Day - School will be closed to all pupils for staff training.
Llwyncrwn Primary School
Monday 23 February 2026
School closed for all pupils
Friday 08 May 2026
INSET day
Maesybryn Primary School
Friday 01 May 2026
School is closed to all children due to staff training.
Monday 20 July 2026
School is closed to all pupils due to staff training.
Maesycoed Primary School
Friday 27 March 2026
School closed to pupils
Friday 17 July 2026
School closed to pupils
Monday 20 July 2026
School closed to pupils
Miskin Primary School
Tuesday 05 May 2026
INSET no school for pupils
Mountain Ash Comprehensive School
Monday 09 February 2026
The school will be closed for an INSET Day
Our Lady's RC Primary School
Friday 23 January 2026
Safeguarding Training INSET Day- school closed to pupils
Monday 20 July 2026
INSET day
Parc Lewis Primary School
Friday 27 February 2026
INSET Day
Monday 20 July 2026
INSET Day
Parc Primary School
Monday 26 January 2026
Treorchy Cluster INSET day.
Park Lane Special School
Friday 17 July 2026
Inset Day
Pengeulan Primary School
Friday 27 March 2026
School Inset Day
Penpych Primary School
Monday 26 January 2026
Treorchy Cluster Inset Day
Penrhiwceibr Primary School
Friday 27 March 2026
Teacher Training event
Penrhys Primary School
Monday 20 July 2026
School will be closed for all staff and children.
Mr. Williams- Hedateacher
Penygawsi Primary School
Friday 06 February 2026
INSET Day school is closed to pupils
Monday 20 July 2026
School is closed to pupils
Penyrenglyn Community Primary School
Monday 26 January 2026
School closed for all pupils
Perthcelyn Community Primary School
Pontyclun Primary School
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
St John Baptist C in W High School
Monday 20 July 2026
LA indicate that the school must be closed on this day and staff work two twilights in lieu. These take place on 13th April 2026; and 15th June 2026.
St Margaret's RC Primary School
Friday 23 January 2026
Safeguarding INSET day School closed to pupils
Monday 20 July 2026
INSET day
St Michael's RC Primary School
Friday 13 February 2026
Staff not on site
Monday 13 April 2026
Staff training day on school site
Tai Education Centre
Thursday 07 May 2026
Day 4 - Staff Training - Closed to all pupils as we are a polling station.
Monday 20 July 2026
Day 6 - Staff Training - Closed to all pupils.
Ton Infants School
Monday 26 January 2026
Inset Day
Ton Pentre Junior School
Monday 26 January 2026
INSET Day - Only staff to attend.
Monday 13 April 2026
INSET Day - Only staff to attend.
Monday 20 July 2026
INSET Day - Only staff to attend.
Tonyrefail Community School
Monday 09 February 2026
INSET Day
Monday 22 June 2026
INSET Day
Monday 20 July 2026
INSET Day
Tonysguboriau Primary School
Trealaw Primary School
Friday 01 May 2026
Inset Day
Monday 20 July 2026
Inset Day
Tref Y Rhyg Primary School
Treorchy Comprehensive School
Treorchy Primary School
Monday 26 January 2026
INSET Day - School will be closed to pupils.
Trerobart Primary School
Monday 13 April 2026
School closed for pupils
Monday 20 July 2026
School closed for pupils
Williamstown Primary School
Y Pant Comprehensive School
Ynyshir Community Primary School
Ysgol Gyfun Cwm Rhondda
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 Awel Taf
Monday 15 June 2026
Dysgu Proffesiynol/Professional Learning: CGY/SIP
Ysgol Gynradd Gymraeg Bodringallt
Monday 02 February 2026
HMS - Diwrnod hyfforddi staff. Nid yw'r ysgol ar agor i blant.
INSET - Staff training day. School is not open to pupils.
Monday 20 July 2026
HMS - Diwrnod hyfforddi staff. Nid yw'r ysgol ar agor i blant.
INSET - Staff training day. School is not open to pupils.
Ysgol Gynradd Gymraeg Bronllwyn
Monday 13 April 2026
Diwrnod HMS 4
INSET Day 4
Ysgol Gynradd Gymraeg Castellau
Monday 02 February 2026
Inset Day
Monday 15 June 2026
Inset Day
Monday 20 July 2026
Inset Day
Ysgol Gynradd Gymraeg Evan James
Friday 22 May 2026
Diwrnod HMS/INSET Day
Ysgol Gynradd Gymraeg Llwyncelyn
Friday 13 February 2026
INSET Day - No school for children
HMS - Dim ysgol i'r plant
Ysgol Gynradd Gymraeg Llyn Y Forwyn
Ysgol Gynradd Gymraeg Ynyswen
Ysgol Gynradd Gymunedol Gymraeg Llantrisant