When to plant tomatoes in Constantine: 17 April – 23 August

In Constantine, tomato: sow for seedlings from 3 February to 2 July; plant into a greenhouse from 27 March to 23 August; plant out into open ground from 17 April to 23 August.

Tomato in Constantine: soil, season and weather

In Constantine the soil, not frost, sets the date: the last frost is over around 20 February, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 17 April, 56 days later.

Last spring frost	20 February
Top 7 cm of soil at 15 °C	17 April, 56 days after the last frost
Into an unheated greenhouse	27 March – 23 August; March outside: 5 °C at night, 17.2 °C by day; card 16–27 °C
First autumn frost	13 December, 240 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	26 June – 1 November
Days left for picking	170
Daylight	11:11 on 24 February, 13:10 on 17 April
Watering outdoors when fruiting (card)	every 3 days; the driest month, July, has 1 rainy day

Tomato in Constantine: care after planting

Planted on 17 April: in the first weeks water every 4 days.

Feeding, by the card’s schedule from that day:

17 April — feed: balanced (NPK)
15 May — feed: nitrogen

Pests and diseases of tomato to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in Constantine during the tomato season

Days average above the tomato card's 16–27 °C in June–September (29.6–36 °C). Months that stay below 16 °C even by day on average: December (14.1 °C). Nights average below 16 °C in April, May and October–December (3.8–11.4 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	20.5	7.5	56	9	13:06
May	24.7	11	59	9	14:05
June	32	16.2	17	3	14:38
July	36	19.3	2	1	14:25
August	34.3	18.7	10	3	13:34
September	29.6	16	27	6	12:27
October	24.3	11.4	36	7	11:18
November	18	6.8	52	9	10:15
December	14.1	3.8	43	8	9:42

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Constantine, Elche is 46 days earlier and Palermo 26 days later.

City	Distance	Date	Difference
Palermo	628 km	13 May – 2 September	26 days later
Ajaccio	644 km	7 May – 19 August	20 days later
Gandia	664 km	from 16 March	32 days earlier
Barcelona	677 km	25 April – 22 August	8 days later
Elche	680 km	from 2 March	46 days earlier
Valencia	703 km	from 7 March	41 days earlier

Where to buy tomato plants and seeds near Constantine

Buy plants ready to set out from 17 April to 23 August (from 27 March to 23 August for an unheated greenhouse); seed for raising your own is sown from 3 February to 2 July. Within 15 km of Constantine OpenStreetMap lists 14 markets (collected 27 October 2026).

Marché n°1 — market
Cité 20 août 1955, constantine · 4 km
Marché n°2 — market
Cité 20 août 1955, constantine · 4 km
MAGROFEL marché de gros des fruits et légumes — market
Zone industrielle Palma, Constantine · 5 km
Marché hebdomadaire du lundi — market
15 km

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.

Questions