When to plant zucchini in Grenoble: 28 June – 8 August

In Grenoble, zucchini: sow for seedlings from 17 May to 18 July; plant into a greenhouse from 7 June to 8 August; plant out into open ground from 28 June to 8 August.

Zucchini 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 zucchini 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
First autumn frost	25 October, 119 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	3 August – 13 September
Days left for picking	83
Daylight	15:31 on 7 June, 15:37 on 28 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, July, has 9 rainy days

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

Zucchini in Grenoble: care after planting

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

Pests and diseases of zucchini to watch for:

Weather in Grenoble during the zucchini season

About 529 mm of rain falls in the season; July is the driest month (83 mm) and June the wettest (130 mm).

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

Zucchini in nearby cities

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

City	Distance	Date	Difference
Chambéry	45 km	3 June – 3 September	25 days earlier
Valence	70 km	29 May – 4 September	30 days earlier
Annecy	86 km	19 June – 28 August	9 days earlier
Lyon	93 km	27 May – 8 September	32 days earlier
Saint-Étienne	108 km	14 June – 31 August	14 days earlier
Geneva	117 km	8 June – 31 August	20 days earlier

Where to buy zucchini plants and seeds near Grenoble

Buy plants ready to set out from 28 June to 8 August (from 7 June to 8 August for an unheated greenhouse); seed for raising your own is sown from 17 May to 18 July. Within 15 km of Grenoble OpenStreetMap lists 17 garden centres, 4 plant nurseries, 55 markets and 19 farm shops (collected 20 October 2026).

Marché Louis Maisonnat — market
Wed 15:00–19:00 · 2 km · ville-fontaine.fr
Marché Alimentaire de Saint Paul de Varces — market
Place de l'Église, 38760 Saint-Paul-de-Varces · Wed 15:30–19:30 · 15 km
Marché de l'Estacade — market
Tue–Sun 07:00–13:00 · 1 km
Place Firmin Gautier — market
Thu 15:00–19:00 · 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.

Questions