When to plant zucchini in Rouen: 16 June – 4 September

In Rouen, zucchini: sow for seedlings from 5 May to 14 August; plant into a greenhouse from 26 May to 4 September; plant out into open ground from 16 June to 4 September.

Zucchini in Rouen: soil, season and weather

In Rouen the soil, not frost, sets the date: the last frost is over around 6 April, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 16 June, 71 days later.

Last spring frost	6 April
Top 7 cm of soil at 18 °C	16 June, 71 days after the last frost
First autumn frost	21 November, 158 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	22 July – 10 October
Days left for picking	122
Daylight	15:46 on 26 May, 16:15 on 16 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, August, has 11 rainy days

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

Zucchini in Rouen: care after planting

Planted on 16 June: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Rouen during the zucchini season

About 430 mm of rain falls in the season; August is the driest month (56 mm) and November the wettest (90 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	21.5	12.2	72	12	16:15
July	23	13.8	57	10	15:53
August	23	13.9	56	11	14:28
September	20.2	11.9	68	12	12:40
October	16	9	87	14	10:51
November	10.7	5.2	90	14	9:08

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Rouen, Paris is 18 days earlier and Brighton 34 days later.

City	Distance	Date	Difference
Le Havre	72 km	11 June – 25 September	5 days earlier
Amiens	100 km	12 June – 4 September	4 days earlier
Caen	109 km	15 June – 18 September	1 day earlier
Paris	111 km	29 May – 3 September	18 days earlier
Le Mans	173 km	31 May – 7 September	16 days earlier
Brighton	178 km	20 July – 14 September	34 days later

Where to buy zucchini plants and seeds near Rouen

Buy plants ready to set out from 16 June to 4 September (from 26 May to 4 September for an unheated greenhouse); seed for raising your own is sown from 5 May to 14 August. Within 15 km of Rouen OpenStreetMap lists 8 garden centres, 18 markets and 15 farm shops (collected 27 October 2026).

Marché Châtelet — market
Place Alfred de Musset, 76000 Rouen · Thu 07:30–12:30 · 4 km
Place Saint-Marc — market
public holidays, Mon–Sun 00:00–24:00 · 0 km
Halles du Vieux Marché — market
Tue–Sat 07:00–19:00; Sun 07:30–13:00 · 1 km
Marché Cauchoise — market
Fri 08:00–18:00 · 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