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 22 May 2026
INSET DAY
Abernant Primary School
Monday 20 July 2026
INSET Day - closed to pupils
Blaengwawr Primary School
Bryncelynnog Comprehensive School
Caegarw Primary School
Monday 08 June 2026
INSET
Friday 03 July 2026
INSET DAY
Caradog Primary School
Friday 19 June 2026
Inset Day. School closed for children.
Monday 20 July 2026
The school will be closed to children for a staff Inset day.
Cardinal Newman RC Comprehensive School
Coedpenmaen Primary School
Craig Yr Hesg Primary School
Cwmbach C in W Primary School
Monday 20 July 2026
INSET DAY
Cwmbach Community Primary School
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
Friday 22 May 2026
Inset Day- School closed for pupils
Friday 17 July 2026
Inset Day- School closed for pupils
Cwmdar Primary School
Monday 08 June 2026
INSET training
Monday 20 July 2026
INSET training
Darrenlas Primary School
Monday 01 June 2026
Inset Day
Monday 20 July 2026
Inset Day
Ferndale Community School
Monday 20 July 2026
INSET DAY FOR ALL SCHOOLS
Gelli Primary School
Monday 15 June 2026
School is closed to all pupils
Monday 20 July 2026
School is closed to all pupils
Glenboi Community Primary School
Monday 01 June 2026
Inset Day
Friday 02 October 2026
INSET Staff Training Day
Gwauncelyn Primary School
Friday 19 June 2026
Self Evaluation activities
Gwaunmeisgyn Primary School
Monday 20 July 2026
Inset Day
Hafod Primary School
Friday 19 June 2026
Inset Day
Friday 17 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
Monday 20 July 2026
The school will be closed to all pupils for staff training.
Llwynypia Primary School
Friday 22 May 2026
Cluster Inset Day
Monday 01 June 2026
Staff training day.
Tuesday 01 September 2026
Staff training.
Wednesday 02 September 2026
Staff training.
Maesybryn Primary School
Monday 20 July 2026
School is closed to all pupils due to staff training.
Maesycoed Primary School
Friday 17 July 2026
School closed to pupils
Monday 20 July 2026
School closed to pupils
Mountain Ash Comprehensive School
Our Lady's RC Primary School
Monday 20 July 2026
INSET day
Parc Lewis Primary School
Monday 20 July 2026
INSET Day
Parc Primary School
Friday 19 June 2026
Staff training
Park Lane Special School
Friday 17 July 2026
Inset Day
Penrhiwceibr Primary School
Monday 20 July 2026
School closed due to INSET
Penrhys Primary School
Monday 20 July 2026
School will be closed for all staff and children.
Mr. Williams- Hedateacher
Penygawsi Primary School
Monday 20 July 2026
School is closed to pupils
Penyrenglyn Community Primary School
Friday 17 July 2026
School closed to all pupils for staff INSET Day
Perthcelyn Community Primary School
Monday 01 June 2026
INSET Day - School closed to all pupils
Monday 20 July 2026
INSET Day - School closed to all pupils
Tuesday 01 September 2026
INSET Day - School closed to all pupils
Monday 02 November 2026
INSET Day - School closed to all pupils
Pontrhondda Primary School
Friday 22 May 2026
School closed to pupils for staff training
Friday 17 July 2026
School closed to pupils for staff training
Monday 20 July 2026
School closed to pupils for staff training
Pontyclun Primary School
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
Monday 20 July 2026
INSET day
St Michael's RC Primary School
Monday 20 July 2026
INSET DAY - school finishes for summer holidays on Friday 17th July 2026
Tai Education Centre
Monday 20 July 2026
Day 6 - Staff Training - Closed to all pupils.
Ton Pentre Junior School
Monday 20 July 2026
INSET Day - Only staff to attend.
Tonyrefail Community School
Monday 22 June 2026
INSET Day
Monday 20 July 2026
INSET Day
Tonysguboriau Primary School
Trealaw Primary School
Monday 20 July 2026
Inset Day
Tref Y Rhyg Primary School
Treorchy Comprehensive School
Treorchy Primary School
Monday 01 June 2026
INSET Day - School will be closed to pupils.
Trerobart Primary School
Monday 20 July 2026
School closed for pupils
Williamstown Primary School
Y Pant Comprehensive School
Ynyshir Community Primary School
Ysgol Afon Wen
Tuesday 01 September 2026
INSET DAY
Wednesday 02 September 2026
INSET DAY
Thursday 03 September 2026
INSET DAY
Ysgol Gyfun Cwm Rhondda
Monday 20 July 2026
Diwrnod HMS - Ysgol ar gau i ddisgyblion INSET Day - School closed to pupils
Ysgol Gynradd Gymraeg Abercynon
Monday 01 June 2026
INSET Training Day
Ysgol Gynradd Gymraeg Aberdar
Friday 17 July 2026
Staff training Day
Monday 20 July 2026
LA mandated INSET day
Ysgol Gynradd Gymraeg Awel Taf
Monday 15 June 2026
Dysgu Proffesiynol/Professional Learning: CGY/SIP
Ysgol Gynradd Gymraeg Bodringallt
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
Ysgol Gynradd Gymraeg Castellau
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 22 May 2026
Diwrnod HMS - Dim ysgol i'r plant
INSET Day - No school for the children
Ysgol Gynradd Gymraeg Llyn Y Forwyn
Ysgol Gynradd Gymraeg Ynyswen
Ysgol Gynradd Gymunedol Gymraeg Llantrisant
Monday 20 July 2026
Diwrnod HMS / INSET Day