GreenlyPoland: frost dates by city
The average last spring frost and first autumn frost in 5 cities of Poland, from ten years of weather. The last spring frost comes earliest in Warsaw and latest in Gdańsk.
| City | Last spring frost | First autumn frost | Frost-free days |
|---|---|---|---|
| Warsaw | 8 April | 17 November | 223 days |
| Wrocław | 17 April | 11 November | 208 days |
| Kraków | 18 April | 1 November | 197 days |
| Poznań | 21 April | 16 November | 209 days |
| Gdańsk | 22 April | 19 November | 211 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.