GreenlySpain: frost dates by city
The average last spring frost and first autumn frost in 9 cities of Spain, from ten years of weather. The last spring frost comes earliest in Valencia and latest in Burgos.
| City | Last spring frost | First autumn frost | Frost-free days |
|---|---|---|---|
| Valencia | 15 January | none in ten years | — |
| Seville | 16 January | none in ten years | — |
| Barcelona | 24 January | 12 December | 322 days |
| Zaragoza | 28 January | 20 December | 326 days |
| Bilbao | 14 March | 26 December | 287 days |
| Madrid | 22 March | 27 November | 250 days |
| Granada | 30 March | 26 November | 241 days |
| Valladolid | 6 April | 27 November | 235 days |
| Burgos | 18 April | 17 November | 213 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.