GreenlyRiga: frost dates
Latvia
| Last spring frost | around 15 April |
|---|---|
| First autumn frost | around 13 November |
| Frost-free days | 212 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 | 11 March | 24 May | 14 June |
| Chili Pepper | 17 March | 30 May | 20 June |
| Corn | — | 20 April | sow 11 May |
| Cucumber | 12 April | 24 May | 14 June |
| Eggplant | 15 March | 24 May | 14 June |
| Green Beans | 14 March | 20 April | 11 May |
| Melon | 2 April | 24 May | 14 June |
| Peas | — | 4 March | sow 25 March |
| Physalis | 25 March | 9 May | 30 May |
| Pumpkin | 2 April | 9 May | 30 May |
| Sweet Corn | — | 20 April | sow 11 May |
| Tomato | 13 March | 9 May | 30 May |
| Watermelon | 22 April | 24 May | 14 June |
| Zucchini | 7 April | 9 May | 30 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 | 14 October |
| Daffodil | 14 October |
| Garlic | 14 October |
| Hyacinth | 14 October |
| Lily | 14 October |
| Tulip | 14 October |
A month before the first autumn frost, so the roots grow before winter.