Growing Conditions · Northern Ireland
Causeway Coast and Glens Growing Conditions
Soil, hardiness and a planting calendar for Causeway Coast and Glens — across 8 postcode districts.
Winter hardiness
A mild area rated RHS H3 — winters usually bottom out around -2°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 (1256mm 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 (~363 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 Causeway Coast and Glens
The long season allows a second sowing of quick crops in July.
Timings are guided by this area's ~363 frost-free days and RHS H3 hardiness; adjust for a cold or sheltered garden.
Conditions by Postcode
| Postcode | Soil | Hardiness | Rainfall |
|---|---|---|---|
| BT44 | — | RHS H3 | 1169mm |
| BT46 | — | RHS H3 | 1210mm |
| BT47 | — | RHS H3 | 1290mm |
| BT49 | — | RHS H3 | 1210mm |
| BT51 | — | RHS H3 | 1210mm |
| BT52 | — | RHS H3 | 1396mm |
| BT53 | — | RHS H3 | 1169mm |
| BT55 | — | RHS H3 | 1396mm |
Planning work in Causeway Coast and Glens?
Browse Companies House-registered landscaping businesses in the area.
