| Gwarchodfa Natur Genedlaethol Cwm Idwal | 403.41 ha | | — |
| Gwarchodfa Natur Genedlaethol Coedydd Aber | 69.4 ha | | — |
| Coed Dolgarrog | 45.67 ha | | — |
| RSPB Conwy RSPB | 38.08 ha | | — |
| Bodnant Garden National Trust | 36.32 ha | | — |
| Coed Dolgarrog | 31.91 ha | | — |
| Eirias Park | 28.13 ha | | — |
| Glan Y Mor Elias | 20.45 ha | | — |
| Pentre Mawr | 17.84 ha | | — |
| Gwarchodfa Natur Genedlaethol Cwm Glas Crafnant | 15.03 ha | | — |
| Mynydd Marian Local Nature Reserve and SSSI | 13.77 ha | 🐕 | — |
| Coed Gorswen National Nature Reserve | 13.58 ha | | — |
| Nanty y Coed | 9.14 ha | | — |
| Coedwig Bodlondeb | 9.0 ha | | — |
| Bryniau | 8.79 ha | | — |
| Bodlondeb Park Conwy County Borough Council | 8.5 ha | | — |
| Bryn Cadno | 7.02 ha | | — |
| Bryn Pydew North Wales Wildlife Trust | 6.43 ha | | — |
| Maes-y-Facrell National Nature Reserve | 5.23 ha | | — |
| Rhiwledyn Nature Reserve | 4.73 ha | | — |
| Conwy Falls Forest Park | 3.74 ha | | — |
| Park Plas Mawr | 2.96 ha | | — |
| inki Gloria | 2.59 ha | | — |
| Horton's Nose Nature Reserve | 2.37 ha | | — |
| Parc Cae Derw | 2.26 ha | | — |
| Rhyd-y-Creuau Field Studies Council | 2.1 ha | | — |
| Hendre Rhys Gethin | 2.02 ha | | — |
| Craig-y-don Park | 1.97 ha | | — |
| Parc Gele | 1.73 ha | | — |
| Min y Don Park | 1.71 ha | | — |
| Maes-y-fachtell | 0.96 ha | | — |
| Haulfre Gardens | 0.66 ha | | — |
| Queens Gardens | 0.57 ha | | — |
| Wynn Gardens | 0.56 ha | | — |
| Tyddyn-du | 0.53 ha | | — |
| Garden for the Blind | 0.14 ha | | — |
| Sensory Garden | 0.03 ha | | — |
| North Western Gardens | — | | — |