When to plant cucumbers in Grenoble: 28 June – 10 August

In Grenoble, cucumber: sow for seedlings from 10 May to 13 July; plant into a greenhouse from 7 June to 10 August; plant out into open ground from 28 June to 10 August. For plants and seeds, the places nearby include La Centrale Jardinerie (garden centre, 1 km) and Jardins Alternatifs (garden centre, 4 km); addresses and opening hours are below.

Cucumber in Grenoble: soil, season and weather

In Grenoble the soil, not frost, sets the date: the last frost is over around 5 May, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 28 June, 54 days later.

Last spring frost	5 May
Top 7 cm of soil at 18 °C	28 June, 54 days after the last frost
Into an unheated greenhouse	7 June – 10 August; June outside: 10.1 °C at night, 20.6 °C by day; card 18–25 °C
First autumn frost	25 October, 119 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	1 August – 13 September
Days left for picking	85
Daylight	15:22 on 31 May, 15:37 on 28 June
Watering outdoors when fruiting (card)	every 2 days; the driest month, July, has 9 rainy days

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

Cucumber in Grenoble: care after planting

Planted on 28 June: in the first weeks water every 4 days.

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

5 July — 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 Grenoble during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, August, averages 22.8 °C. Months that stay below 18 °C even by day on average: October (14.1 °C). Nights average below 18 °C in every month of the season, from 4.3 °C to 11.7 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	20.6	10.1	130	13	15:37
July	22.7	11.7	83	9	15:19
August	22.8	11.7	87	8	14:08
September	18	7.7	101	11	12:35
October	14.1	4.3	128	11	11:01

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

All the nearest cities on our list plant cucumber earlier than Grenoble; the closest date is in Annecy, 9 days earlier.

City	Distance	Date	Difference
Chambéry	45 km	3 June – 5 September	25 days earlier
Valence	70 km	29 May – 6 September	30 days earlier
Annecy	86 km	19 June – 30 August	9 days earlier
Lyon	93 km	27 May – 10 September	32 days earlier
Saint-Étienne	108 km	14 June – 2 September	14 days earlier
Geneva	117 km	8 June – 2 September	20 days earlier

Where to buy cucumber plants and seeds near Grenoble

Buy plants ready to set out from 28 June to 10 August (from 7 June to 10 August for an unheated greenhouse); seed for raising your own is sown from 10 May to 13 July. Within 15 km of Grenoble OpenStreetMap lists 17 garden centres, 4 plant nurseries, 55 markets and 19 farm shops (collected 20 October 2026).

Les jardins de Malissoles — garden centre
Chemin de Malissoles · Wed 15:00–19:30 · 12 km · meraki-lechantdupaysan.fr
La Centrale Jardinerie — garden centre
Square Docteur Léon Martin 6, 38000 Grenoble · Tue–Wed, Fri–Sat 10:15–19:00; Thu 14:15–19:00 · 1 km
Gamm Vert — garden centre
Allée des Acacias 3 · Mon–Sat 08:30–19:30 · 6 km
Jardins Alternatifs — garden centre
Mon 10:30–13:00, 14:00–18:30; Tue–Sat 09:30–13:00, 14:00–18:30 · 4 km · jardins-alternatifs-grenoble.com

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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