When to plant cucumbers in Mons: 10 June – 4 September

In Mons, cucumber: sow for seedlings from 22 April to 7 August; plant into a greenhouse from 20 May to 4 September; plant out into open ground from 10 June to 4 September. For plants and seeds, the places nearby include Les Jardins du Kiwanis - Ancien Ets Horticulture JOB (garden centre, 2 km) and Les Jardins du Brayou (garden centre, 10 km); addresses and opening hours are below.

Cucumber in Mons: soil, season and weather

In Mons the soil, not frost, sets the date: the last frost is over around 10 April, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 10 June, 61 days later.

Last spring frost	10 April
Top 7 cm of soil at 18 °C	10 June, 61 days after the last frost
Into an unheated greenhouse	20 May – 4 September; May outside: 8.5 °C at night, 18.4 °C by day; card 18–25 °C
First autumn frost	19 November, 162 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	14 July – 8 October
Days left for picking	128
Daylight	15:21 on 13 May, 16:21 on 10 June
Watering outdoors when fruiting (card)	every 2 days; the driest month, August, has 12 rainy days

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

Cucumber in Mons: 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 Mons during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, August, averages 23.5 °C. Months that stay below 18 °C even by day on average: October (15.7 °C) and November (10.1 °C). Nights average below 18 °C in every month of the season, from 4.7 °C to 14.2 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	22.1	12.7	79	11	16:25
July	23.2	13.8	67	11	16:02
August	23.5	14.2	61	12	14:34
September	20.3	11.8	66	11	12:41
October	15.7	9.2	75	13	10:48
November	10.1	4.7	69	13	9:02

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

Around Mons, Ghent is 10 days earlier and Namur 1 day later.

City	Distance	Date	Difference
Charleroi	35 km	10 June – 31 August	same day
Brussels	53 km	8 June – 7 September	2 days earlier
Namur	65 km	11 June – 31 August	1 day later
Lille	66 km	11 June – 6 September	1 day later
Ghent	69 km	31 May – 9 September	10 days earlier
Leuven	71 km	31 May – 7 September	10 days earlier

Where to buy cucumber plants and seeds near Mons

Buy plants ready to set out from 10 June to 4 September (from 20 May to 4 September for an unheated greenhouse); seed for raising your own is sown from 22 April to 7 August. Within 15 km of Mons OpenStreetMap lists 21 garden centres, 1 farm-supply shop, 2 plant nurseries, 8 markets and 15 farm shops (collected 27 October 2026).

Les Jardins du Kiwanis - Ancien Ets Horticulture JOB — garden centre
Chemin de la Procession 350-352 · Fri 09:30–11:45, 14:00–17:00; Sat 09:30–11:45 · 2 km
Central Jardin — garden centre
Rue de Chièvres 388, 7332 Neufmaison · 14 km
La Châtaigneraie — garden centre
Avenue Prince Baudouin 88, 7131 Waudrez · 16 km
Les Jardins du Brayou — garden centre
Avenue de la Cité 43, 7130 Bray · 10 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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