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
Friday 18 December 2026
School will be closed for Staff Training
Aberdare Community School
Friday 23 October 2026
Inset Day
Monday 05 April 2027
Inset Day
Monday 19 July 2027
Inset Day
Tuesday 20 July 2027
Inset Day
Aberdare Park Primary School
Friday 02 October 2026
School will be closed to learners on this day
Friday 05 February 2027
School will be closed to learners on this day
Aberdare Town C in W Primary
Friday 23 October 2026
School closed for staff training
Monday 19 July 2027
School closed for staff training
Tuesday 20 July 2027
School closed for staff training
Blaengwawr Primary School
Monday 19 July 2027
INSET Day
Tuesday 20 July 2027
INSET Day
Bryncelynnog Comprehensive School
Friday 23 October 2026
INSET Day
Friday 28 May 2027
INSET Day
Friday 02 July 2027
INSET Day
Monday 19 July 2027
INSET Day
Tuesday 20 July 2027
INSET Day
Brynnau Primary School
Friday 18 December 2026
SDP termly reviews
Monday 04 January 2027
Rich tasks and Problem solving training
Monday 07 June 2027
Assessment and moderation
Tuesday 20 July 2027
Data transfer and Assessment
Caegarw Primary School
Friday 18 September 2026
INSET
Friday 02 October 2026
INSET
Capcoch Primary School
Friday 23 October 2026
The school will be closed to children for a staff Inset day.
Monday 04 January 2027
The school will be closed to children for a staff Inset day.
Friday 05 February 2027
The school will be closed to children for a staff Inset day.
Friday 28 May 2027
The school will be closed to children for a staff Inset day.
Friday 02 July 2027
The school will be closed to children for a staff Inset day.
Cardinal Newman RC Comprehensive School
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
Monday 02 November 2026
INSET day - School will be closed for staff training
Monday 04 January 2027
INSET day - School will be closed for staff training
Friday 28 May 2027
INSET day - School will be closed for staff training
Monday 19 July 2027
INSET day - School will be closed for staff training
Tuesday 20 July 2027
INSET day - School will be closed for staff training
Coedylan Primary School
Friday 02 October 2026
The school will be closed for staff training
Friday 28 May 2027
The school will be closed for staff training
Monday 19 July 2027
The school will be closed for staff training
Tuesday 20 July 2027
The school will be closed for staff training
Cwmaman Primary School
Friday 23 October 2026
Inset day, school will be closed to pupils.
Monday 04 January 2027
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.
Cwmbach C in W Primary School
Friday 23 October 2026
SCHOOL CLOSED FOR STAFF TRAINNG
Cwmbach Community Primary School
Friday 23 October 2026
School will be closed to pupils for INSET
Thursday 06 May 2027
School will be closed to pupils for INSET
Monday 19 July 2027
School will be closed to pupils for INSET
Tuesday 20 July 2027
School will be closed to pupils for INSET
Cwmclydach Community Primary School
Monday 04 January 2027
Inset Day- School closed to pupils
Friday 28 May 2027
INSET DAY- School closed for pupils
Friday 25 June 2027
INSET DAY- School closed for pupils
Monday 19 July 2027
INSET DAY- School closed for pupils
Tuesday 20 July 2027
INSET DAY- School closed for pupils
Cwmdar Primary School
Friday 23 October 2026
INSET Day
Monday 19 July 2027
INSET Day
Tuesday 20 July 2027
INSET Day
Cwmlai Primary School
Friday 19 March 2027
INSET Day
Friday 30 April 2027
INSET Day
Monday 19 July 2027
INSET Days:
Monday 19th July
Tuesday 20th July
Tuesday 20 July 2027
INSET Days:
Monday 19th July
Tuesday 20th July
Cymmer Primary School
Friday 06 November 2026
Inset Day, staff in cluster training.
Darran Park Primary School
Friday 23 October 2026
INSET Day - staff training, school closed to all pupils
Monday 02 November 2026
INSET Day - Staff Training - school closed to all pupils
Darrenlas Primary School
Thursday 06 May 2027
Inset Day
Dolau Primary School
Monday 12 October 2026
Inset Day - Diwrnod HMS
Monday 19 July 2027
Inset Day - Diwrnod HMS
Tuesday 20 July 2027
Inset Day - Diwrnod HMS
Gelli Primary School
Friday 22 January 2027
INSET day. School closed to all pupils
Glenboi Community Primary School
Friday 02 October 2026
INSET Staff Training Day
Hafod Primary School
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
Friday 18 December 2026
INSET Day: Staff training
Friday 19 March 2027
INSET Day: Staff Training
Friday 30 April 2027
INSET Day: Staff Training
Monday 19 July 2027
INSET Day: Staff Training
Tuesday 20 July 2027
INSET Day: Staff Training
Hirwaun Primary School
Friday 23 October 2026
Cluster Inset Day - school closed for pupils
Monday 04 January 2027
Inset day - school closed for pupils
Monday 19 July 2027
Inset day - school closed for pupils
Tuesday 20 July 2027
Inset day - school closed for pupils
Llanhari Primary School
Friday 02 October 2026
No school for pupils
Friday 18 December 2026
no school for pupils
Llanilltud Faerdref Primary School
Friday 02 October 2026
No school for pupils, Training day for staff
Friday 18 December 2026
No school for pupils, Training day for staff
Monday 04 January 2027
No school for pupils, Training day for staff
Monday 19 July 2027
No school for pupils, Training day for staff
Tuesday 20 July 2027
No school for pupils, Training day for staff
Llantrisant Primary School
Monday 02 November 2026
The school will be closed to all pupils for staff training.
Llwydcoed Primary School
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
Maesgwyn Special School
Monday 04 January 2027
Staff training - school closed to pupils.
Monday 05 April 2027
Staff training - school closed to pupils.
Friday 28 May 2027
Staff training - school closed to pupils.
Monday 19 July 2027
Staff training - school closed to pupils.
Tuesday 20 July 2027
Staff training - school closed to pupils.
Maesybryn Primary School
Friday 23 October 2026
School is closed for staff training. Children to return on Monday 2nd November.
Maesycoed Primary School
Monday 19 July 2027
Inset Day
Tuesday 20 July 2027
Inset Day
Mountain Ash Comprehensive School
Monday 04 January 2027
INSET Day
School will be closed to pupils
Monday 05 April 2027
INSET Day
School will be closed to pupils
Oaklands Primary School
Friday 23 October 2026
inset day
Monday 19 July 2027
Inset day
Tuesday 20 July 2027
Inset day
Parc Lewis Primary School
Monday 07 September 2026
School will be closed to pupils on Monday 7th September to allow all staff to access Learning and Teaching Professional Training.
Parc Primary School
Friday 22 January 2027
Treorchy Cluster training day
Penderyn Primary School
Friday 25 September 2026
Staff Training
Friday 23 October 2026
Staff Training
Monday 04 January 2027
Staff Training
Pengeulan Primary School
Friday 18 September 2026
Cluster Training Day
Friday 30 April 2027
School Inset Day
Penpych Primary School
Friday 22 January 2027
Cluster Inset Day
Monday 19 July 2027
INSET DAY
Tuesday 20 July 2027
INSET DAY
Penrhiwceibr Primary School
Friday 18 September 2026
School closed due to INSET
Monday 04 January 2027
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
Friday 27 November 2026
School will be closed for all pupils due to staff training.
Friday 12 March 2027
School will be closed for all pupils due to staff training.
Penygawsi Primary School
Monday 19 July 2027
Staff training day - no school for pupils
Tuesday 20 July 2027
Staff training day - no school for pupils
Penyrenglyn Community Primary School
Friday 22 January 2027
School closed to all pupils for staff INSET Day
Perthcelyn Community Primary School
Friday 02 October 2026
INSET Day - School closed to all pupils
Monday 02 November 2026
INSET Day - School closed to all pupils
Pontyclun Primary School
Monday 04 January 2027
staff training
Monday 05 April 2027
staff training
Monday 19 July 2027
staff training
Tuesday 20 July 2027
staff training
Pontygwaith Primary School
Friday 23 October 2026
INSET Day -School closed for pupils
Porth Community School
Friday 02 October 2026
INSET Day
Monday 25 January 2027
INSET Day
Monday 19 July 2027
INSET Day
Tuesday 20 July 2027
INSET Day
St John Baptist C in W High School
Friday 16 October 2026
INSET DAY
Friday 27 November 2026
INSET DAY
Monday 19 July 2027
INSET DAY
Tuesday 20 July 2027
INSET DAY
St Margaret's RC Primary School
Friday 23 October 2026
RE Cluster Day
Ton Infants School
Monday 28 September 2026
Inset Day
Friday 22 January 2027
Inset Day
Monday 19 July 2027
Inset Day
Tuesday 20 July 2027
Inset Day
Ton Pentre Junior School
Monday 28 September 2026
INSET Day - Only staff to attend.
Friday 22 January 2027
INSET Day - Only staff to attend.
Monday 19 July 2027
INSET Day - Only staff to attend.
Tuesday 20 July 2027
INSET Day - Only staff to attend.
Tonysguboriau Primary School
Monday 16 November 2026
INSET
Monday 04 January 2027
INSET
Monday 19 July 2027
INSET
Tuesday 20 July 2027
INSET
Trallwng Infants School
Monday 04 January 2027
No school for children - School closed for staff training.
Friday 30 April 2027
No school for children - School closed for staff training.
Monday 19 July 2027
No school for children - School closed for staff training.
Tuesday 20 July 2027
No school for children - School closed for staff training.
Tref Y Rhyg Primary School
Friday 18 December 2026
INSET Day
Friday 19 March 2027
INSET Day
Thursday 06 May 2027
INSET Day
Monday 19 July 2027
INSET Days - 19th July and 20th July 2027
Tuesday 20 July 2027
INSET Days - 19th July and 20th July 2027
Treorchy Comprehensive School
Friday 20 November 2026
INSET DAY
Friday 05 February 2027
INSET DAY
Monday 19 July 2027
INSET DAY
Tuesday 20 July 2027
INSET DAY
Treorchy Primary School
Friday 22 January 2027
INSET Day - School will be closed to pupils for staff training.
Monday 19 July 2027
INSET Day - School will be closed to pupils.
Tuesday 20 July 2027
INSET Day - School will be closed to pupils.
Ty Gwyn Education Centre
Friday 23 October 2026
INSET
Friday 05 February 2027
INSET
Monday 05 April 2027
INSET
Monday 07 June 2027
INSET
Williamstown Primary School
Friday 19 March 2027
INSET Day - Closed to all pupils
Friday 28 May 2027
INSET Day - Closed to all pupils
Monday 19 July 2027
INSET Day - Closed to all pupils
Tuesday 20 July 2027
INSET Day - Closed to all pupils
Y Pant Comprehensive School
Monday 23 November 2026
INSET Day
Friday 28 May 2027
INSET day
Monday 19 July 2027
INSET Day
Tuesday 20 July 2027
INSET Day
Ynysboeth Primary School
Friday 18 December 2026
INSET DAY
Ynyshir Community Primary School
Friday 06 November 2026
Closure for staff training.
Monday 04 January 2027
Inset day
Monday 19 July 2027
Inset Day
Tuesday 20 July 2027
Inset Day
Ysgol Afon Wen
Friday 04 December 2026
INSET Day
Friday 30 April 2027
INSET Day
Ysgol Bro Taf
Friday 27 November 2026
INSET Day
Friday 18 December 2026
INSET Day
Monday 19 July 2027
INSET Day
Tuesday 20 July 2027
INSET Day
Ysgol Garth Olwg
Friday 02 October 2026
Diwrnod Dysgu Proffesiynol Staff (HMS) / Staff Professional Learning Day (INSET)
Monday 15 February 2027
Diwrnod Dysgu Proffesiynol Staff (HMS) / Staff Professional Learning Day (INSET)
Friday 25 June 2027
Diwrnod Dysgu Proffesiynol Staff (HMS) / Staff Professional Learning Day (INSET)
Monday 19 July 2027
Diwrnod Dysgu Proffesiynol Staff (HMS) / Staff Professional Learning Day (INSET)
Tuesday 20 July 2027
Diwrnod Dysgu Proffesiynol Staff (HMS) / Staff Professional Learning Day (INSET)
Ysgol Gyfun Rhydywaun
Friday 23 October 2026
Bydd yr ysgol ar gau i ddisgyblion oherwydd diwrnod hyfforddiant Dysgu Proffesiynol i staff.
The school is closed to pupils due to a scheduled Professional Learning day for Staff.
Monday 05 July 2027
Bydd yr ysgol ar gau i ddisgyblion oherwydd diwrnod hyfforddiant Dysgu Proffesiynol i staff.
The school is closed to pupils due to a scheduled Professional Learning day for Staff.
Monday 19 July 2027
Bydd yr ysgol ar gau i ddisgyblion oherwydd diwrnod hyfforddiant Dysgu Proffesiynol i staff.
The school is closed to pupils due to a scheduled Professional Learning day for Staff.
Tuesday 20 July 2027
Bydd yr ysgol ar gau i ddisgyblion oherwydd diwrnod hyfforddiant Dysgu Proffesiynol i staff.
The school is closed to pupils due to a scheduled Professional Learning day for Staff.
Ysgol Gynradd Gymraeg Abercynon
Friday 02 October 2026
INSET Day
Friday 23 October 2026
Cluster INSET Day
Friday 18 December 2026
Inset Day
Ysgol Gynradd Gymraeg Aberdar
Friday 23 October 2026
Cluster development Day YGG Rhydywaun
Ysgol Gynradd Gymraeg Awel Taf
Wednesday 23 September 2026
HMS Dysgu ac Addysgu/INSET Teaching and Learning
Friday 23 October 2026
Hyfforddiant Dylunio a Thechnoleg/ Design and Technology training
Monday 19 July 2027
HMS/INSET
Tuesday 20 July 2027
HMS/INSET
Ysgol Gynradd Gymraeg Castellau
Monday 28 September 2026
Diwrnod HMS - dim ysgol i'r plant
INSET day - no school for pupils
Ysgol Gynradd Gymraeg Evan James
Friday 18 December 2026
Diwrnod HMS - Ysgol ar gau i ddisgyblion INSET Day - School closed to pupils
Monday 19 July 2027
Diwrnod HMS - Ysgol ar gau i ddisgyblion INSET Day - School closed to pupils
Tuesday 20 July 2027
Diwrnod HMS - Ysgol ar gau i ddisgyblion INSET Day - School closed to pupils
Ysgol Gynradd Gymraeg Llwyncelyn
Monday 19 July 2027
DIWRNOD HMS - Ysgol ar gau i'r plant
INSET DAY - School closed for the children
Tuesday 20 July 2027
DIWRNOD HMS - Ysgol ar gau i'r plant
INSET DAY - School closed for the children
Ysgol Gynradd Gymraeg Llyn Y Forwyn
Friday 02 October 2026
INSET
Monday 04 January 2027
HMS / Inset School closed for pupils
Ysgol Gynradd Gymraeg Tonyrefail
Monday 12 October 2026
HMS / INSET DAY
Ysgol Gynradd Gymunedol Gymraeg Llantrisant
Monday 12 October 2026
Diwrnod HMS / INSET Day
Monday 04 January 2027
Diwrnod HMS / INSET Day
Monday 19 July 2027
Diwrnod HMS / INSET Day
Tuesday 20 July 2027
Diwrnod HMS / INSET Day
Ysgol Hen Felin
Monday 04 January 2027
INSET DAY
Tuesday 05 January 2027
INSET DAY
Friday 19 March 2027
INSET DAY
Monday 05 April 2027
INSET DAY
Ysgol Llanhari
Monday 12 October 2026
Diwrnod HMS i'r Adran Gynradd yn unig.
INSET day for the Primary Department only.
Friday 13 November 2026
Diwrnod HMS ysgol gyfan.
Whole school INSET day.
Monday 15 February 2027
Diwrnod HMS i'r Adran Uwchradd yn unig,.
INSET day for the Secondary Department only.
Monday 19 July 2027
Diwrnod HMS ysgol gyfan.
INSET day for whole school.
Tuesday 20 July 2027
Diwrnod HMS ysgol gyfan.
INSET day for whole school.
Ysgol Nantgwyn
Friday 23 October 2026
INSET day
Monday 04 January 2027
INSET day
Friday 28 May 2027
INSET day
Monday 19 July 2027
INSET day
Tuesday 20 July 2027
INSET day