Algeria: frost dates by city

The average last spring frost and first autumn frost in 4 cities of Algeria, from ten years of weather. The last spring frost comes earliest in Tlemcen and latest in Constantine.

City	Last spring frost	First autumn frost	Frost-free days	Soil at 10 °C	Tomato: planting out	Places to buy (OpenStreetMap)
Algiers	none in ten years	none in ten years	—	already in the first week of January	—	51
Oran	none in ten years	none in ten years	—	already in the first week of January	—	11
Tlemcen	17 February	1 January	318 days	already in the first week of January	18 March – 11 September	7
Constantine	20 February	13 December	296 days	21 February	17 April – 23 August	14

The last spring frost comes 3 days later in Constantine (20 February) than in Tlemcen (17 February). The frost-free season lasts 296–318 days.

Gardening in Algeria: climate zones and crops by region

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.