When to plant cucumbers in Charleroi: 10 June – 31 August

In Charleroi, cucumber: sow for seedlings from 22 April to 3 August; plant into a greenhouse from 20 May to 31 August; plant out into open ground from 10 June to 31 August. For plants and seeds, the places nearby include Tournesols (garden centre, 4 km) and MH Parcs (garden centre, 7 km); addresses and opening hours are below.

Cucumber in Charleroi: soil, season and weather

In Charleroi the soil, not frost, sets the date: the last frost is over around 13 April, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 10 June, 58 days later.

Last spring frost	13 April
Top 7 cm of soil at 18 °C	10 June, 58 days after the last frost
Into an unheated greenhouse	20 May – 31 August; May outside: 8.2 °C at night, 18 °C by day; card 18–25 °C
First autumn frost	15 November, 158 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	14 July – 4 October
Days left for picking	124
Daylight	15:21 on 13 May, 16:20 on 10 June
Watering outdoors when fruiting (card)	every 2 days; the driest month, August, has 12 rainy days

The same dates in Charleroi hold for Bell Pepper, Eggplant, Zucchini, Pumpkin and Watermelon.

Cucumber in Charleroi: care after planting

Planted on 10 June: in the first weeks water every 4 days.

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

17 June — feed: nitrogen

Pests and diseases of cucumber 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 Charleroi during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, August, averages 23.3 °C. Months that stay below 18 °C even by day on average: October (15.3 °C) and November (9.7 °C). Nights average below 18 °C in every month of the season, from 4.3 °C to 13.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	21.8	12.4	78	11	16:25
July	22.9	13.5	71	11	16:02
August	23.3	13.9	58	12	14:33
September	20	11.4	65	10	12:41
October	15.3	8.8	78	13	10:48
November	9.7	4.3	68	13	9:02

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

Around Charleroi, Hasselt is 11 days earlier and Namur 1 day later.

City	Distance	Date	Difference
Namur	31 km	11 June – 31 August	1 day later
Mons	35 km	10 June – 4 September	same day
Brussels	49 km	8 June – 7 September	2 days earlier
Leuven	55 km	31 May – 7 September	10 days earlier
Liège	84 km	4 June – 4 September	6 days earlier
Hasselt	86 km	30 May – 3 September	11 days earlier

Where to buy cucumber plants and seeds near Charleroi

Buy plants ready to set out from 10 June to 31 August (from 20 May to 31 August for an unheated greenhouse); seed for raising your own is sown from 22 April to 3 August. Within 15 km of Charleroi OpenStreetMap lists 15 garden centres, 2 farm-supply shops, 2 plant nurseries, 7 markets and 7 farm shops (collected 27 October 2026).

Tournesols — garden centre
Chaussée de Châtelineau 315 · 4 km · tournesols.be
MH Parcs — garden centre
Rue de Villers 86, 6280 · Mon–Fri 08:00–17:00 · 7 km
Etablissements Botte — garden centre
Rue Bois-Loué 52, 6230 Pont-à-Celles · 13 km
Aveve — garden centre
Mon–Sat 09:00–18:00; Sun 09:00–12:00 · 13 km · aveve.be

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.

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