When to plant cucumbers in Geneva: 8 June – 2 September

In Geneva, cucumber: sow for seedlings from 20 April to 5 August; plant into a greenhouse from 18 May to 2 September; plant out into open ground from 8 June to 2 September. For plants and seeds, the places nearby include Les Pots Classes (garden centre, 1 km) and Gamm Vert (garden centre, 8 km); addresses and opening hours are below.

Cucumber in Geneva: soil, season and weather

In Geneva 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 8 June, 59 days later.

Last spring frost	10 April
Top 7 cm of soil at 18 °C	8 June, 59 days after the last frost
Into an unheated greenhouse	18 May – 2 September; May outside: 7.9 °C at night, 17.9 °C by day; card 18–25 °C
First autumn frost	17 November, 162 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	12 July – 6 October
Days left for picking	128
Daylight	14:47 on 11 May, 15:40 on 8 June
Watering outdoors when fruiting (card)	every 2 days; the driest month, August, has 9 rainy days

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

Cucumber in Geneva: care after planting

Planted on 8 June: in the first weeks water every 4 days.

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

15 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 Geneva during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, August, averages 25.9 °C. Months that stay below 18 °C even by day on average: October (15.8 °C) and November (9.3 °C). Nights average below 18 °C in every month of the season, from 1.9 °C to 14.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	23.5	13.1	104	13	15:45
July	25.8	14.9	88	11	15:26
August	25.9	14.7	80	9	14:12
September	20.8	11	85	10	12:36
October	15.8	6.9	113	11	10:59
November	9.3	1.9	122	14	9:28

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

Around Geneva, Chambéry is 5 days earlier and Aosta 23 days later.

City	Distance	Date	Difference
Annecy	32 km	19 June – 30 August	11 days later
Lausanne	52 km	19 June – 5 September	11 days later
Chambéry	72 km	3 June – 5 September	5 days earlier
Sion	94 km	28 June – 4 August	20 days later
Fribourg	102 km	21 June – 22 August	13 days later
Aosta	105 km	1 July – 7 August	23 days later

Where to buy cucumber plants and seeds near Geneva

Buy plants ready to set out from 8 June to 2 September (from 18 May to 2 September for an unheated greenhouse); seed for raising your own is sown from 20 April to 5 August. Within 15 km of Geneva OpenStreetMap lists 16 garden centres, 2 farm-supply shops, 8 markets and 23 farm shops (collected 27 October 2026).

Gamm Vert — garden centre
Route de chez Montagnon 64 · Mon–Sat 09:00–12:00, 14:00–19:00 · 14 km · magasin.gammvert.fr
Gamm Vert — garden centre
Rue des Vieux Moulins 3, 74160 Saint-Julien-en-Genevois · Mon–Fri 09:00–12:00, 14:00–18:30; Fri 09:00–12:00, 14:00–18:00; Aug 15 closed · 8 km
J. Vaudaux — garden centre
Route de Taninges 138, 74100 Vétraz-Monthoux · Mon–Fri 08:30–12:00, 14:00–18:30; Sat 08:30–17:00; Sun closed · 11 km
Les Pots Classes — garden centre
Rue de la Faucille 4, 1201 Genève · Tue–Fri 10:00–19:00, Thu 10:00–20:00 · 1 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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