GreenlyOslo: frost dates
Norway
In Oslo the last spring frost usually comes around 6 May and the first autumn frost around 19 October, which leaves about 166 frost-free days (median of 2016–2025). Tomato seedlings can go into open ground around 5 June.
| Last spring frost | around 6 May |
|---|---|
| First autumn frost | around 19 October |
| Frost-free days | 166 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 | 1 April | 14 June | 5 July |
| Chili Pepper | 16 March | 29 May | 19 June |
| Corn | — | 2 May | sow 23 May |
| Cucumber | 3 May | 14 June | 5 July |
| Eggplant | 5 April | 14 June | 5 July |
| Green Beans | 26 March | 2 May | 23 May |
| Melon | 23 April | 14 June | 5 July |
| Peas | — | 25 March | sow 15 April |
| Physalis | 31 March | 15 May | 5 June |
| Pumpkin | 8 April | 15 May | 5 June |
| Sweet Corn | — | 2 May | sow 23 May |
| Tomato | 19 March | 15 May | 5 June |
| Watermelon | 13 May | 14 June | 5 July |
| Zucchini | 13 April | 15 May | 5 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.
Oslo: 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 |
|---|---|
| Crocus | 19 September |
| Daffodil | 19 September |
| Garlic | 19 September |
| Hyacinth | 19 September |
| Lily | 19 September |
| Tulip | 19 September |
A month before the first autumn frost, so the roots grow before winter.