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Last and first frost dates in Constantine

Algeria

In Constantine the last spring frost usually comes around 20 February and the first autumn frost around 13 December, which leaves about 296 frost-free days (median of 2016–2025). Tomato seedlings can go into open ground from 17 April to 23 August.

Last spring frostaround 20 February
First autumn frostaround 13 December
Frost-free days296 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 is the last frost in Constantine?

The last frost in Constantine usually comes around 20 February: that is the median of 2016–2025, so in about half of those years the last night at or below 0 °C came later. Hardy crops start before it and frost-tender ones only after it: in the table below arugula can go into open ground from 30 January, while corn waits until 13 March. The first autumn frost follows around 13 December, about 296 days later: harvest or cover frost-tender crops before then.

When to sow and plant

CropSow for seedlingsPlant out in a greenhouseOpen ground
Achocha28 December – 4 September6 February – 14 October27 February – 14 October
Ageratumfrom 30 January—from 17 April
Arugula——sow 30 January – 8 November
Basil9 March – 11 October16 April – 18 November7 May – 18 November
Beet——sow 30 January – 14 October
Bell Pepper15 February – 24 June16 April – 23 August7 May – 23 August
Black-eyed Susanfrom 6 December—from 27 February
Bok Choy2 January – 22 October6 February – 26 November27 February – 26 November
Borage——sow 27 February – 19 October
Broad bean——sow 30 January – 4 September
Broccoli——sow 30 January – 28 August
Brussels Sprouts25 November – 26 July9 January – 9 September30 January – 9 September
Busy Lizziefrom 5 December—from 27 February
Cabbage——sow 30 January – 5 August
Calendula——sow from 30 January
Carrot——sow 30 January – 20 September
Cauliflower28 November – 28 August9 January – 9 October30 January – 9 October
Celeriac21 November – 25 June6 February – 10 September27 February – 10 September
Celery21 November – 5 July6 February – 20 September27 February – 20 September
Celosiafrom 16 Februaryfrom 2 Aprilfrom 23 April
Chamomile——sow 30 January – 9 October
Chayote24 November – 18 June20 February – 14 September13 March – 14 September
Chickpea——sow 30 January – 25 August
Chicory15 December – 19 September—30 January – 14 October
Chili Pepper15 February – 31 July16 April – 29 September7 May – 29 September
China asterfrom 23 Februaryfrom 16 Aprilfrom 7 May
Chives——sow 30 January – 30 September
Cilantro——sow 30 January – 10 October
Corn——sow 13 March – 25 August
Corn poppy——sow from 30 January
Cosmosfrom 16 Februaryfrom 2 Aprilfrom 23 April
Cucumber19 March – 31 August16 April – 28 September7 May – 28 September
Daikon——sow 30 January – 7 October
Delphiniumfrom 11 November—from 30 January
Dill——sow 30 January – 20 October
Edging lobeliafrom 5 December—from 27 February
Eggplant15 February – 24 June16 April – 23 August7 May – 23 August
Florence fennel23 December – 4 September6 February – 19 October27 February – 19 October
Foxglovefrom 24 October—from 30 January
Garden sorrel——sow 30 January – 8 October
Green Beans——sow 23 April – 2 September
Hollyhock——sow from 30 January
Hyssop——sow 30 January – 31 August
Kale——sow 30 January – 2 October
Kiwano23 February – 7 September27 March – 9 October17 April – 9 October
Kohlrabi——sow 30 January – 12 October
Leek31 October – 16 June9 January – 25 August30 January – 25 August
Lemon balm——sow 30 January – 4 October
Lettuce——sow 30 January – 17 October
Lisianthusfrom 14 Octoberfrom 9 Januaryfrom 30 January
Lovage——sow from 30 January
Luffa5 March – 2 July16 April – 13 August7 May – 13 August
Marigoldfrom 26 Decemberfrom 6 Februaryfrom 27 February
Marjoram15 February – 19 September—7 May – 18 November
Melon19 March – 18 August16 April – 15 September7 May – 15 September
Microgreens——sow 23 April – 29 November
Moringa4 March – 24 September28 April – 18 November19 May – 18 November
Moss rosefrom 12 December—from 27 February
Mustard greens——sow 30 January – 29 October
Napa cabbage4 January – 29 September6 February – 1 November27 February – 1 November
Nasturtiumfrom 30 Decemberfrom 6 Februaryfrom 27 February
Okra5 March – 12 September16 April – 24 October7 May – 24 October
Oregano10 November – 9 September9 January – 8 November30 January – 8 November
Pansyfrom 14 Novemberfrom 9 Januaryfrom 30 January
Parsley——sow 30 January – 28 September
Parsnip——sow 30 January – 17 August
Peanut10 March – 8 August16 April – 14 September7 May – 14 September
Peas——sow 30 January – 30 September
Petuniafrom 12 Februaryfrom 16 Aprilfrom 7 May
Physalis10 February – 5 August27 March – 19 September17 April – 19 September
Pumpkin5 March – 7 July16 April – 18 August7 May – 18 August
Purple coneflowerfrom 8 November—from 30 January
Radish——sow 30 January – 13 November
Sage21 November – 5 September9 January – 24 October30 January – 24 October
Scarlet sagefrom 3 February—from 17 April
Snapdragonfrom 5 Novemberfrom 9 Januaryfrom 30 January
Soybean——sow 7 May – 24 September
Spinach——sow 30 January – 19 October
Stevia6 February – 27 July27 March – 14 September17 April – 14 September
Stock——sow from 30 January
Sunflower——sow from 23 April
Sweet alyssum——sow from 30 January
Sweet Corn9 February – 19 September3 March – 11 October24 March – 11 October
Sweet peafrom 28 Novemberfrom 9 Januaryfrom 30 January
Sweet William——sow from 30 January
Swiss Chard——sow 30 January – 14 October
Thyme——sow 30 January – 25 August
Tomato3 February – 2 July27 March – 23 August17 April – 23 August
Turnip——sow 30 January – 16 October
Watercress——sow 30 January – 27 October
Watermelon19 March – 6 August16 April – 3 September7 May – 3 September
Zinniafrom 24 Marchfrom 28 Aprilfrom 19 May
Zucchini26 March – 5 September16 April – 26 September7 May – 26 September

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. Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

When the soil warms up in Constantine

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo). The soil reaches 10 °C 1 day after the last spring frost and 15 °C 56 days after it.

SoilDateAgainst the last spring frost
5 °Calready in the first week of January—
10 °C21 February1 day later
15 °C17 April56 days later
18 °C7 May76 days later

Frost dates near Constantine

CityDistanceLast spring frostFirst autumn frost
Algiers320 km——
Tunis322 km——
Sousse367 km——
Cagliari386 km——
Sfax417 km——

Seeds, seedlings and markets in Constantine

Within 15 km of Constantine OpenStreetMap lists 14 markets (collected 27 October 2026). The nearest market to the city centre is Marché n°1, 4 km away.

Places: © OpenStreetMap contributors, ODbL.

What to grow at home in winter in Constantine

Frosts in Constantine usually come from about 13 December to about 20 February. These plants have indoor care in their Greenly cards and are harvested quickly, so they can be sown on a windowsill in winter.

Weather in Constantine by month

Average weather in Constantine over 2016–2025: the warmest month is July. Months that average 20 °C or more by day: April–October (20.5–36 °C). Months that average 30 °C or more by day: June (32 °C), July (36 °C) and August (34.3 °C). No month averages below 0 °C at night; the coldest nights, in January, average 2.3 °C. About 432 mm of rain falls in a year, on 79 days; May is the wettest month (59 mm) and July the driest (2 mm).

MonthDay, °CNight, °CRain, mmRainy days
January132.3418
February14.93.1357
March17.25549
April20.57.5569
May24.711599
June3216.2173
July3619.321
August34.318.7103
September29.616276
October24.311.4367
November186.8529
December14.13.8438

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

CropWhen to plant
Bearded Irisby 13 November
Crocusby 13 November
Daffodilby 13 November
Garlic13 November – end of December
Grape hyacinthby 13 November
Helleboreby 13 November
Hyacinthby 13 November
Lilyby 13 November
Ornamental onionby 13 November
Peonyby 13 November
Saffronby 13 November
Snowdropby 13 November
Tulipby 13 November
Wild garlicby 13 November

From a month before the first autumn frost, so the roots grow before winter, to the late-planting limit on each crop’s page (about two weeks before the ground freezes, by ten years of weather).