When to plant cucumbers in Liège: 4 June – 4 September

In Liège, cucumber: sow for seedlings from 16 April to 7 August; plant into a greenhouse from 14 May to 4 September; plant out into open ground from 4 June to 4 September. For plants and seeds, the places nearby include Moulin Boland (garden centre, 5 km) and Pépinière de la Rimière (garden centre, 13 km); addresses and opening hours are below.

Cucumber in Liège: soil, season and weather

In Liège the soil, not frost, sets the date: the last frost is over around 16 April, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 4 June, 49 days later.

Last spring frost	16 April
Top 7 cm of soil at 18 °C	4 June, 49 days after the last frost
Into an unheated greenhouse	14 May – 4 September; May outside: 8.7 °C at night, 18.6 °C by day; card 18–25 °C
First autumn frost	19 November, 168 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	8 July – 8 October
Days left for picking	134
Daylight	15:04 on 7 May, 16:15 on 4 June
Watering outdoors when fruiting (card)	every 2 days; the driest month, August, has 12 rainy days

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

Cucumber in Liège: care after planting

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

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

11 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 Liège 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 (15.6 °C) and November (10 °C). Nights average below 18 °C in every month of the season, from 4.5 °C to 14.4 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	22.5	13.1	84	12	16:27
July	23.3	14	72	13	16:04
August	23.5	14.4	66	12	14:35
September	20.3	11.7	74	12	12:41
October	15.6	9.2	74	13	10:48
November	10	4.5	68	14	9:00

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

Around Liège, Hasselt is 5 days earlier and Namur 7 days later.

City	Distance	Date	Difference
Hasselt	37 km	30 May – 3 September	5 days earlier
Namur	53 km	11 June – 31 August	7 days later
Leuven	67 km	31 May – 7 September	4 days earlier
Charleroi	84 km	10 June – 31 August	6 days later
Brussels	89 km	8 June – 7 September	4 days later
Ettelbruck	95 km	6 June – 31 August	2 days later

Where to buy cucumber plants and seeds near Liège

Buy plants ready to set out from 4 June to 4 September (from 14 May to 4 September for an unheated greenhouse); seed for raising your own is sown from 16 April to 7 August. Within 15 km of Liège OpenStreetMap lists 11 garden centres, 3 plant nurseries, 7 markets and 12 farm shops (collected 27 October 2026).

Moulin Boland — garden centre
Rue Wathieu 22 · 5 km · moulinboland.be
Pépinière de la Rimière — garden centre
Route d'Esneux 79 · 13 km · lapepinieredelarimiere.be
Bonhomme Vert - Fexhe — garden centre
Grand'Route, Fexhe-Le-Haut-Clocher · 14 km
Pépinières de Louveigné — plant nursery
Rue de La Gendarmerie 38, 4141 Louveigné · 15 km · pepinieresdelouveigne.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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