When to plant pumpkins in Grenoble: 28 June – 30 June

In Grenoble, pumpkin: sow for seedlings from 26 April to 19 May; plant into a greenhouse from 7 June to 30 June; plant out into open ground from 28 June to 30 June.

Pumpkin 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 pumpkin card — only around 28 June, 54 days later. 119 days separate planting out (28 June) from the first autumn frost (25 October); the card's 75 days to the first harvest leave 44 for picking, so a start 6 weeks late would still fit.

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)	75
First harvest, if planted in this window	11 September – 13 September
Days left for picking	44
Daylight	14:55 on 17 May, 15:37 on 28 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, July, has 9 rainy days

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

Pumpkin 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:

19 July — feed: nitrogen

Pests and diseases of pumpkin 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 pumpkin 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

Pumpkin in nearby cities

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

City	Distance	Date	Difference
Chambéry	45 km	3 June – 26 July	25 days earlier
Valence	70 km	29 May – 27 July	30 days earlier
Annecy	86 km	19 June – 20 July	9 days earlier
Lyon	93 km	27 May – 31 July	32 days earlier
Saint-Étienne	108 km	14 June – 23 July	14 days earlier
Geneva	117 km	8 June – 23 July	20 days earlier

Where to buy pumpkin plants and seeds near Grenoble

Buy plants ready to set out from 28 June to 30 June (from 7 June to 30 June for an unheated greenhouse); seed for raising your own is sown from 26 April to 19 May. Within 15 km of Grenoble OpenStreetMap lists 17 garden centres, 4 plant nurseries, 55 markets and 19 farm shops (collected 20 October 2026).

Marché Place aux Herbes — market
Tue–Fri 07:00–13:00; Sat–Sun 07:00–13:30 · 1 km
Halle Sainte-Claire — market
Tue–Sun 07:00–13:00 · 1 km
Marché Hoche — market
Sat 07:00–13:30 · 1 km
Kiosque — market
24/7 · 3 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