Growing Conditions · Northern Ireland
Belfast Growing Conditions
Soil, hardiness and a planting calendar for Belfast — across 13 postcode districts.
Winter hardiness
A mild area rated RHS H3 — winters usually bottom out around -3°C. Most hardy plants are safe, and you can grow half-hardy exotics that fail further north, but the occasional hard frost means tender plants still want a sheltered wall or winter fleece.
Rain & growing season
A wet climate (1096mm a year): plants rarely go thirsty, but lean on good drainage, disease-resistant varieties and falls that shed water off paving and lawns. A long growing season (~355 frost-free days) — you can sow earlier and harvest later than most of the country, and squeeze in a second late sowing.
Planting Calendar for Belfast
The long season allows a second sowing of quick crops in July.
Timings are guided by this area's ~355 frost-free days and RHS H3 hardiness; adjust for a cold or sheltered garden.
Conditions by Postcode
| Postcode | Soil | Hardiness | Rainfall |
|---|---|---|---|
| BT1 | — | RHS H3 | 1096mm |
| BT11 | — | RHS H3 | 1096mm |
| BT12 | — | RHS H3 | 1096mm |
| BT13 | — | RHS H3 | 1096mm |
| BT15 | — | RHS H3 | 1096mm |
| BT17 | — | RHS H3 | 1096mm |
| BT3 | — | RHS H3 | 1096mm |
| BT4 | — | RHS H3 | 1096mm |
| BT5 | — | RHS H3 | 1096mm |
| BT6 | — | RHS H3 | 1096mm |
| BT7 | — | RHS H3 | 1096mm |
| BT8 | — | RHS H3 | 1096mm |
| BT9 | — | RHS H3 | 1096mm |
Planning work in Belfast?
Browse Companies House-registered landscaping businesses in the area.
