When to plant cucumbers in Namur: 11 June – 31 August

In Namur, cucumber: sow for seedlings from 23 April to 3 August; plant into a greenhouse from 21 May to 31 August; plant out into open ground from 11 June to 31 August. For plants and seeds, the places nearby include Aveve (garden centre, 3 km) and Ets Cassart (garden centre, 6 km); addresses and opening hours are below.

Cucumber in Namur: soil, season and weather

In Namur the soil, not frost, sets the date: the last frost is over around 11 April, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 11 June, 61 days later.

Last spring frost	11 April
Top 7 cm of soil at 18 °C	11 June, 61 days after the last frost
Into an unheated greenhouse	21 May – 31 August; May outside: 8.2 °C at night, 18 °C by day; card 18–25 °C
First autumn frost	15 November, 157 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	15 July – 4 October
Days left for picking	123
Daylight	15:24 on 14 May, 16:22 on 11 June
Watering outdoors when fruiting (card)	every 2 days; the driest month, August, has 12 rainy days

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

Cucumber in Namur: care after planting

Planted on 11 June: in the first weeks water every 4 days.

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

18 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 Namur during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, August, averages 23.1 °C. Months that stay below 18 °C even by day on average: October (15.2 °C) and November (9.6 °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	12.5	76	11	16:25
July	22.8	13.5	70	12	16:02
August	23.1	13.9	62	12	14:34
September	19.8	11.4	65	11	12:41
October	15.2	8.8	75	13	10:48
November	9.6	4.3	67	13	9:01

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

All the nearest cities on our list plant cucumber earlier than Namur; the closest date is in Charleroi, 1 day earlier.

City	Distance	Date	Difference
Charleroi	31 km	10 June – 31 August	1 day earlier
Leuven	47 km	31 May – 7 September	11 days earlier
Liège	53 km	4 June – 4 September	7 days earlier
Brussels	56 km	8 June – 7 September	3 days earlier
Hasselt	61 km	30 May – 3 September	12 days earlier
Mons	65 km	10 June – 4 September	1 day earlier

Where to buy cucumber plants and seeds near Namur

Buy plants ready to set out from 11 June to 31 August (from 21 May to 31 August for an unheated greenhouse); seed for raising your own is sown from 23 April to 3 August. Within 15 km of Namur OpenStreetMap lists 14 garden centres, 2 plant nurseries, 3 markets and 11 farm shops (collected 27 October 2026).

Agri-Garden — garden centre
Rue de Soye 6, 5190 Spy · Feb 15–Jun 30, Sept 15–Dec 20 Sat 09:00–16:00, Sun 09:00–11:00 · 11 km
Aveve — garden centre
Mon–Sat 09:00–18:00 · 3 km · aveve.be
Ets Cassart — garden centre
Chaussée de Dinant 1178 · 6 km · cassart-wepion.be
Pascal Goset — garden centre
Route de Perwez 86, 5310 Liernu · 13 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.

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