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
Friday 17 July 2026
School will be closed to learners
Monday 20 July 2026
School will be closed to learners
Abernant Primary School
Monday 20 July 2026
INSET Day - closed to pupils
Blaengwawr Primary School
Bryncelynnog Comprehensive School
Caegarw Primary School
Friday 03 July 2026
INSET DAY
Capcoch Primary School
Tuesday 01 September 2026
The school will be closed to children for a staff Inset day.
Caradog Primary School
Monday 20 July 2026
The school will be closed to children for a staff Inset day.
Cardinal Newman RC Comprehensive School
Tuesday 01 September 2026
Staff Training
Wednesday 02 September 2026
Staff Training
Friday 23 October 2026
Staff Training
Friday 18 December 2026
Staff Training
Monday 19 July 2027
Staff Training
Tuesday 20 July 2027
Staff Training
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 20 July 2026
School will be closed for Inset day
Cwmclydach Community Primary School
Friday 17 July 2026
Inset Day- School closed for pupils
Cwmdar Primary School
Monday 20 July 2026
INSET training
Darrenlas Primary School
Monday 20 July 2026
Inset Day
Thursday 06 May 2027
Inset Day
Ferndale Community School
Monday 20 July 2026
INSET DAY FOR ALL SCHOOLS
Tuesday 01 September 2026
INSET DAY
Gelli Primary School
Monday 20 July 2026
School is closed to all pupils
Glenboi Community Primary School
Friday 02 October 2026
INSET Staff Training Day
Gwauncelyn Primary School
Gwaunmeisgyn Primary School
Monday 20 July 2026
Inset Day
Hafod Primary School
Friday 17 July 2026
Inset Day
Tuesday 01 September 2026
INSET Day- the school is closed to pupils.
Monday 04 January 2027
INSET Day- the school is closed to pupils.
Monday 19 July 2027
INSET Day- the school is closed to pupils.
Tuesday 20 July 2027
INSET Day- the school is closed to pupils.
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.
Llwydcoed Primary School
Monday 20 July 2026
INSET Day
Tuesday 01 September 2026
INSET Day
Monday 02 November 2026
INSET Day
Monday 04 January 2027
INSET Day
Monday 05 April 2027
INSET Day
Monday 19 July 2027
INSET Day
Tuesday 20 July 2027
INSET Day
Llwynypia Primary School
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.
Tuesday 01 September 2026
School is closed for staff training. Children to return to school on Thursday 3rd September.
Wednesday 02 September 2026
School is closed for staff training. Children to return to school on Thursday 3rd September.
Friday 23 October 2026
School is closed for staff training. Children to return on Monday 2nd November.
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
Park Lane Special School
Friday 17 July 2026
Inset Day
Pengeulan Primary School
Tuesday 01 September 2026
Designated Inset Day
Monday 28 September 2026
Cluster Training Day
Penpych Primary School
Friday 17 July 2026
INSET DAY
Monday 20 July 2026
INSET Day
Tuesday 01 September 2026
Safeguarding Training - Whole staff
Wednesday 02 September 2026
School INSET Day
Monday 19 July 2027
INSET DAY
Tuesday 20 July 2027
INSET DAY
Penrhiwceibr Primary School
Monday 20 July 2026
School closed due to INSET
Tuesday 01 September 2026
School closed due to INSET
Friday 18 September 2026
School closed due to INSET
Friday 19 March 2027
School closed due to INSET
Monday 19 July 2027
School closed due to INSET
Tuesday 20 July 2027
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 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 17 July 2026
School closed to pupils for staff training
Monday 20 July 2026
School closed to pupils for staff training
Pontyclun Primary School
Monday 20 July 2026
staff training
Pontygwaith Primary School
Porth Community School
Friday 03 July 2026
INSET Day
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
Friday 17 July 2026
Day 5 - Staff Training - Closed to all pupils.
Monday 20 July 2026
Day 6 - Staff Training - Closed to all pupils.
Ton Infants School
Tuesday 01 September 2026
Inset Day
Ton Pentre Junior School
Monday 20 July 2026
INSET Day - Only staff to attend.
Tuesday 01 September 2026
INSET Day - Only staff to attend.
Wednesday 02 September 2026
INSET Day - Only staff to attend.
Tonyrefail Community School
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
Tuesday 01 September 2026
INSET Day - School will be closed to pupils.
Wednesday 02 September 2026
INSET Day - School will be closed to pupils.
Monday 19 July 2027
INSET Day - School will be closed to pupils.
Tuesday 20 July 2027
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
Tuesday 01 September 2026
Inset Days for staff training
Wednesday 02 September 2026
Inset Days for staff training
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 Aberdar
Friday 17 July 2026
Staff training Day
Monday 20 July 2026
LA mandated INSET day
Tuesday 01 September 2026
Whole school Safeguarding training
Wednesday 02 September 2026
Whole school Safeguarding training
Friday 23 October 2026
Cluster development Day YGG Rhydywaun
Ysgol Gynradd Gymraeg Awel Taf
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
Friday 03 July 2026
Diwrnod HMS 5 - dim ysgol i`r plant.
INSET Day 5 - no school for pupils.
Monday 20 July 2026
Diwrnod HMS 6- dim ysgol i`r plant.
INSET Day 6 - no school for pupils.
Ysgol Gynradd Gymraeg Castellau
Monday 20 July 2026
Inset Day
Ysgol Gynradd Gymraeg Evan James
Ysgol Gynradd Gymraeg Llwyncelyn
Monday 29 June 2026
Diwrnod HMS - Dim ysgol i'r plant
INSET Day - No school for children
Ysgol Gynradd Gymraeg Llyn Y Forwyn
Ysgol Gynradd Gymraeg Tonyrefail
Friday 03 July 2026
Bydd yr ysgol ar gau oherwydd hyfforddiant staff. School closed for staff training.
Monday 20 July 2026
Ysgol ar gau HMS / School closed Inset Day
Ysgol Gynradd Gymraeg Ynyswen
Monday 13 July 2026
Hyfforddiant Mewn Swydd / INSET day. Diolch am eich cefnogaeth. Thank you for your support.
Ysgol Gynradd Gymunedol Gymraeg Llantrisant
Monday 20 July 2026
Diwrnod HMS / INSET Day
Ysgol Hen Felin
Tuesday 01 September 2026
INSET DAY
Wednesday 02 September 2026
INSET DAY
Monday 04 January 2027
INSET DAY
Tuesday 05 January 2027
INSET DAY
Friday 19 March 2027
INSET DAY
Monday 05 April 2027
INSET DAY