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The site was identified as internationally important for bird conservation in 2007 because it was regularly supporting significant populations of the species listed below, meeting IBA criteria.

Populations meeting IBA criteria ('key species') at the site:

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Red-billed Chough Pyrrhocorax pyrrhocorax	LC	breeding (2002)	16 breeding pairs	B2

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2007. The most recent assessment (2007) is shown below.

Response (conservation actions taken for the key species and/or their habitats)
Designation	Planning	Action	Result
Little/none of site covered (<10%)	Unknown	Not assessed	very low

Year	Protected Area	Designation (management category)	% coverage of IBA
1957	Llyn	Area of Outstanding Natural Beauty (V)	56
1957	Lleyn (Llyn)	Area of Outstanding Natural Beauty (V)	-
1971	Yr Eifl	Site of Special Scientific Interest (UK) (IV)	5
1971	Gallt-y-Bwlch	Site of Special Scientific Interest (UK) (IV)	<1
1971	Carreg y Llam	Site of Special Scientific Interest (UK) (IV)	<1
1979	Dinas Dinlle	Site of Special Scientific Interest (UK) (IV)	<1
1981	Coed Elernion	Site of Special Scientific Interest (UK) (IV)	<1
1981	Porth Dinllaen i Borth Pistyll	Site of Special Scientific Interest (UK) (IV)	<1
1989	Gwydir Bay	Site of Special Scientific Interest (UK) (IV)	1
1989	Caeau Tan y Bwlch	Site of Special Scientific Interest (UK) (IV)	<1
1990	Pistyll	Nature Reserve (V)	<1
1992	Coed Cwmgwared	Site of Special Scientific Interest (UK) (IV)	<1
1993	Caeau Tan-y-Bwlch	Nature Reserve (IV)	<1
1995	Cappas Lwyd	Site of Special Scientific Interest (UK) (IV)	<1
2001	Cors y Wlad	Site of Special Scientific Interest (UK) (IV)	<1
2002	Dinas Dinlle	Nature Reserve (V)	<1
2013	Yr Eifl	National Nature Reserve (IV)	<1

Habitat	% of IBA	Habitat detail
Marine Coastal/Supratidal	-

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Recommended citation
BirdLife International (2025) Important Bird Area factsheet: Trefor (United Kingdom). Downloaded from https://datazone.birdlife.org/site/factsheet/trefor-iba-united-kingdom on 26/01/2025.