GreenlyBilbao: frost dates
Spain
| Last spring frost | around 14 March |
|---|---|
| First autumn frost | around 26 December |
| Frost-free days | 287 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 | 27 February | 12 May | 2 June |
| Chili Pepper | 14 March | 27 May | 17 June |
| Corn | — | 11 March | sow 1 April |
| Cucumber | 31 March | 12 May | 2 June |
| Eggplant | 3 March | 12 May | 2 June |
| Green Beans | 2 February | 11 March | 1 April |
| Melon | 21 March | 12 May | 2 June |
| Peas | — | 31 January | sow 21 February |
| Physalis | 7 March | 21 April | 12 May |
| Pumpkin | 15 March | 21 April | 12 May |
| Sweet Corn | — | 11 March | sow 1 April |
| Tomato | 23 February | 21 April | 12 May |
| Watermelon | 10 April | 12 May | 2 June |
| Zucchini | 20 March | 21 April | 12 May |
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 | 26 November |
| Daffodil | 26 November |
| Garlic | 26 November |
| Hyacinth | 26 November |
| Lily | 26 November |
| Tulip | 26 November |
A month before the first autumn frost, so the roots grow before winter.