GreenlyRiga: frost dates
Latvia
In Riga the last spring frost usually comes around 15 April and the first autumn frost around 13 November, which leaves about 212 frost-free days (median of 2016–2025). Tomato seedlings can go into open ground around 30 May.
| 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 |
|---|---|---|---|
| Achocha | 3 March | 12 April | 3 May |
| Arugula | — | 4 March | sow 25 March |
| Basil | 16 April | 24 May | 14 June |
| Beet | — | 4 March | sow 25 March |
| Bell Pepper | 11 March | 24 May | 14 June |
| Black-eyed Susan | 2 March | — | 3 May |
| Bok Choy | 8 March | 12 April | 3 May |
| Broad bean | — | 4 March | sow 25 March |
| Broccoli | — | 4 March | sow 25 March |
| Brussels Sprouts | 18 January | 4 March | 25 March |
| Cabbage | — | 4 March | sow 25 March |
| Calendula | — | 4 March | sow 25 March |
| Carrot | — | — | sow 25 March |
| Cauliflower | 21 January | 4 March | 25 March |
| Celeriac | 25 January | 12 April | 3 May |
| Celery | 25 January | 12 April | 3 May |
| Celosia | 29 March | 13 May | 3 June |
| Chamomile | — | 4 March | sow 25 March |
| Chayote | 22 January | 20 April | 11 May |
| Chickpea | — | — | sow 25 March |
| Chili Pepper | 17 March | 30 May | 20 June |
| China aster | 2 April | 24 May | 14 June |
| Chives | — | — | sow 25 March |
| Cilantro | — | 4 March | sow 25 March |
| Corn | — | 20 April | sow 11 May |
| Cosmos | 29 March | 13 May | 3 June |
| Cucumber | 12 April | 24 May | 14 June |
| Daikon | — | 4 March | sow 25 March |
| Delphinium | 25 January | — | 25 March |
| Dill | — | 4 March | sow 25 March |
| Eggplant | 15 March | 24 May | 14 June |
| Florence fennel | 26 February | 12 April | 3 May |
| Garden sorrel | — | 4 March | sow 25 March |
| Green Beans | 14 March | 20 April | 11 May |
| Hyssop | — | — | sow 25 March |
| Kale | — | 4 March | sow 25 March |
| Kiwano | 7 April | 9 May | 30 May |
| Kohlrabi | — | 4 March | sow 25 March |
| Leek | 24 December | 4 March | 25 March |
| Lemon balm | — | 4 March | sow 25 March |
| Lettuce | — | 4 March | sow 25 March |
| Lisianthus | 7 December | 4 March | 25 March |
| Lovage | — | — | sow 25 March |
| Luffa | 12 April | 24 May | 14 June |
| Marigold | 1 March | 12 April | 3 May |
| Melon | 2 April | 24 May | 14 June |
| Microgreens | — | 13 May | sow 3 June |
| Moringa | 5 April | 30 May | 20 June |
| Mustard greens | — | 4 March | sow 25 March |
| Napa cabbage | 10 March | 12 April | 3 May |
| Nasturtium | 5 March | 12 April | 3 May |
| Okra | 12 April | 24 May | 14 June |
| Oregano | 3 January | 4 March | 25 March |
| Pansy | 7 January | 4 March | 25 March |
| Parsley | — | 4 March | sow 25 March |
| Parsnip | — | — | sow 25 March |
| Peanut | 17 April | 24 May | 14 June |
| Peas | — | 4 March | sow 25 March |
| Petunia | 22 March | 24 May | 14 June |
| Physalis | 25 March | 9 May | 30 May |
| Pumpkin | 2 April | 9 May | 30 May |
| Purple coneflower | 22 January | — | 25 March |
| Radish | — | — | sow 25 March |
| Sage | 14 January | 4 March | 25 March |
| Snapdragon | 29 December | 4 March | 25 March |
| Spinach | — | 4 March | sow 25 March |
| Stevia | 21 March | 9 May | 30 May |
| Stock | — | 4 March | sow 25 March |
| Sunflower | — | 13 May | sow 3 June |
| Sweet Corn | — | 20 April | sow 11 May |
| Sweet pea | 21 January | 4 March | 25 March |
| Sweet William | — | — | sow 25 March |
| Swiss Chard | — | 4 March | sow 25 March |
| Thyme | — | 4 March | sow 25 March |
| Tomato | 13 March | 9 May | 30 May |
| Turnip | — | 4 March | sow 25 March |
| Watercress | — | 4 March | sow 25 March |
| Watermelon | 22 April | 24 May | 14 June |
| Zinnia | 25 April | 30 May | 20 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.
Riga: weather for the next 7 days
Forecast by Open-Meteo. Nights at or below 0 °C are marked as frost.
Weather in Riga by month
Average weather in Riga over 2016–2025: the warmest month is July, the wettest July.
| Month | Day, °C | Night, °C | Rain, mm | Rainy days |
|---|---|---|---|---|
| January | 0.4 | -3.6 | 55 | 14 |
| February | 1.4 | -2.9 | 46 | 12 |
| March | 5.3 | -1 | 38 | 11 |
| April | 10.1 | 2.8 | 43 | 11 |
| May | 15.6 | 7.5 | 51 | 9 |
| June | 20.6 | 13.1 | 75 | 12 |
| July | 21.8 | 15.1 | 95 | 16 |
| August | 21.5 | 14.4 | 94 | 14 |
| September | 17.7 | 11.3 | 66 | 12 |
| October | 11.2 | 6.2 | 86 | 16 |
| November | 5.5 | 2 | 55 | 13 |
| December | 2.2 | -1.3 | 52 | 14 |
Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).
Planted in autumn
| Crop | Plant around |
|---|---|
| Bearded Iris | 14 October |
| Crocus | 14 October |
| Daffodil | 14 October |
| Garlic | 14 October |
| Hyacinth | 14 October |
| Lily | 14 October |
| Peony | 14 October |
| Saffron | 14 October |
| Tulip | 14 October |
| Wild garlic | 14 October |
A month before the first autumn frost, so the roots grow before winter.