GreenlyPorto: frost dates
Portugal
In Porto the last spring frost usually comes around 26 January and the first autumn frost around 19 December, which leaves about 327 frost-free days (median of 2016–2025). Tomato seedlings can go into open ground around 15 April.
| Last spring frost | around 26 January |
|---|---|
| First autumn frost | around 19 December |
| Frost-free days | 327 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 |
|---|---|---|---|
| Achocha | 3 December | 12 January | 2 February |
| Arugula | — | 15 December | sow 5 January |
| Basil | 24 March | 1 May | 22 May |
| Beet | — | 15 December | sow 5 January |
| Bell Pepper | 16 February | 1 May | 22 May |
| Black-eyed Susan | 2 December | — | 2 February |
| Bok Choy | 8 December | 12 January | 2 February |
| Broad bean | — | 15 December | sow 5 January |
| Broccoli | — | 15 December | sow 5 January |
| Brussels Sprouts | 31 October | 15 December | 5 January |
| Cabbage | — | 15 December | sow 5 January |
| Calendula | — | 15 December | sow 5 January |
| Carrot | — | — | sow 5 January |
| Cauliflower | 3 November | 15 December | 5 January |
| Celeriac | 27 October | 12 January | 2 February |
| Celery | 27 October | 12 January | 2 February |
| Celosia | 15 February | 1 April | 22 April |
| Chamomile | — | 15 December | sow 5 January |
| Chayote | 25 October | 21 January | 11 February |
| Chickpea | — | — | sow 5 January |
| Chili Pepper | 24 February | 9 May | 30 May |
| China aster | 10 March | 1 May | 22 May |
| Chives | — | — | sow 5 January |
| Cilantro | — | 15 December | sow 5 January |
| Corn | — | 21 January | sow 11 February |
| Cosmos | 15 February | 1 April | 22 April |
| Cucumber | 20 March | 1 May | 22 May |
| Daikon | — | 15 December | sow 5 January |
| Delphinium | 7 November | — | 5 January |
| Dill | — | 15 December | sow 5 January |
| Eggplant | 20 February | 1 May | 22 May |
| Florence fennel | 28 November | 12 January | 2 February |
| Garden sorrel | — | 15 December | sow 5 January |
| Green Beans | 15 December | 21 January | 11 February |
| Hyssop | — | — | sow 5 January |
| Kale | — | 15 December | sow 5 January |
| Kiwano | 21 February | 25 March | 15 April |
| Kohlrabi | — | 15 December | sow 5 January |
| Leek | 6 October | 15 December | 5 January |
| Lemon balm | — | 15 December | sow 5 January |
| Lettuce | — | 15 December | sow 5 January |
| Lisianthus | 19 September | 15 December | 5 January |
| Lovage | — | — | sow 5 January |
| Luffa | 20 March | 1 May | 22 May |
| Marigold | 1 December | 12 January | 2 February |
| Melon | 10 March | 1 May | 22 May |
| Microgreens | — | 1 April | sow 22 April |
| Moringa | 15 March | 9 May | 30 May |
| Mustard greens | — | 15 December | sow 5 January |
| Napa cabbage | 10 December | 12 January | 2 February |
| Nasturtium | 5 December | 12 January | 2 February |
| Okra | 20 March | 1 May | 22 May |
| Oregano | 16 October | 15 December | 5 January |
| Pansy | 20 October | 15 December | 5 January |
| Parsley | — | 15 December | sow 5 January |
| Parsnip | — | — | sow 5 January |
| Peanut | 25 March | 1 May | 22 May |
| Peas | — | 15 December | sow 5 January |
| Petunia | 27 February | 1 May | 22 May |
| Physalis | 8 February | 25 March | 15 April |
| Pumpkin | 16 February | 25 March | 15 April |
| Purple coneflower | 4 November | — | 5 January |
| Radish | — | — | sow 5 January |
| Sage | 27 October | 15 December | 5 January |
| Snapdragon | 11 October | 15 December | 5 January |
| Spinach | — | 15 December | sow 5 January |
| Stevia | 4 February | 25 March | 15 April |
| Stock | — | 15 December | sow 5 January |
| Sunflower | — | 1 April | sow 22 April |
| Sweet Corn | — | 21 January | sow 11 February |
| Sweet pea | 3 November | 15 December | 5 January |
| Sweet William | — | — | sow 5 January |
| Swiss Chard | — | 15 December | sow 5 January |
| Thyme | — | 15 December | sow 5 January |
| Tomato | 27 January | 25 March | 15 April |
| Turnip | — | 15 December | sow 5 January |
| Watercress | — | 15 December | sow 5 January |
| Watermelon | 30 March | 1 May | 22 May |
| Zinnia | 4 April | 9 May | 30 May |
| Zucchini | 21 February | 25 March | 15 April |
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.
Porto: weather for the next 7 days
Forecast by Open-Meteo. Nights at or below 0 °C are marked as frost.
Planted in autumn
| Crop | Plant around |
|---|---|
| Bearded Iris | 19 November |
| Crocus | 19 November |
| Daffodil | 19 November |
| Garlic | 19 November |
| Hyacinth | 19 November |
| Lily | 19 November |
| Peony | 19 November |
| Saffron | 19 November |
| Tulip | 19 November |
| Wild garlic | 19 November |
A month before the first autumn frost, so the roots grow before winter.