GreenlyDublin: frost dates
Ireland
| Last spring frost | around 7 April |
|---|---|
| First autumn frost | around 24 November |
| Frost-free days | 231 days |
Median of 2016–2025 for the 25 km grid cell of the city: the last day at or below 0 °C in spring and the first in autumn (ERA5 reanalysis via Open-Meteo). In a cold year a frost can come a week or two later — Greenly warns 48 hours ahead.
When to sow and plant
| Crop | Sow for seedlings | Plant out in a greenhouse | Open ground |
|---|---|---|---|
| Bell Pepper | 12 April | 25 June | 16 July |
| Chili Pepper | 18 April | 1 July | 22 July |
| Corn | — | 21 April | sow 12 May |
| Cucumber | 14 May | 25 June | 16 July |
| Eggplant | 16 April | 25 June | 16 July |
| Green Beans | 15 March | 21 April | 12 May |
| Melon | 4 May | 25 June | 16 July |
| Peas | — | 24 February | sow 17 March |
| Physalis | 7 April | 22 May | 12 June |
| Pumpkin | 15 April | 22 May | 12 June |
| Sweet Corn | — | 21 April | sow 12 May |
| Tomato | 26 March | 22 May | 12 June |
| Watermelon | 24 May | 25 June | 16 July |
| Zucchini | 20 April | 22 May | 12 June |
Planting out: a week after the last frost once the soil is warm enough for the crop; frost-hardy crops three weeks before it; an unheated greenhouse three weeks earlier. Seedlings are sown so they are ready on that day.
Planted in autumn
| Crop | Plant around |
|---|---|
| Crocus | 25 October |
| Daffodil | 25 October |
| Garlic | 25 October |
| Hyacinth | 25 October |
| Lily | 25 October |
| Tulip | 25 October |
A month before the first autumn frost, so the roots grow before winter.