When to plant cucumbers in Rouen: 16 June – 6 September

In Rouen, cucumber: sow for seedlings from 28 April to 9 August; plant into a greenhouse from 26 May to 6 September; plant out into open ground from 16 June to 6 September. For plants and seeds, the places nearby include Jardi E. Leclerc (garden centre, 6 km) and Gamm Vert (garden centre, 10 km); addresses and opening hours are below.

Cucumber 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 cucumber 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
Into an unheated greenhouse	26 May – 6 September; May outside: 8.6 °C at night, 17.7 °C by day; card 18–25 °C
First autumn frost	21 November, 158 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	20 July – 10 October
Days left for picking	124
Daylight	15:30 on 19 May, 16:15 on 16 June
Watering outdoors when fruiting (card)	every 2 days; the driest month, August, has 11 rainy days

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

Cucumber in Rouen: care after planting

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

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

23 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 Rouen during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, July, averages 23 °C. Months that stay below 18 °C even by day on average: October (16 °C) and November (10.7 °C). Nights average below 18 °C in every month of the season, from 5.2 °C to 13.9 °C.

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

Cucumber 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 – 27 September	5 days earlier
Amiens	100 km	12 June – 6 September	4 days earlier
Caen	109 km	15 June – 20 September	1 day earlier
Paris	111 km	29 May – 5 September	18 days earlier
Le Mans	173 km	31 May – 9 September	16 days earlier
Brighton	178 km	20 July – 16 September	34 days later

Where to buy cucumber plants and seeds near Rouen

Buy plants ready to set out from 16 June to 6 September (from 26 May to 6 September for an unheated greenhouse); seed for raising your own is sown from 28 April to 9 August. Within 15 km of Rouen OpenStreetMap lists 8 garden centres, 18 markets and 15 farm shops (collected 27 October 2026).

Desjardins — garden centre
Rue de Tourville 1522, 76410 Cléon · Mon–Sun 09:00–19:00 · 15 km
Jardi E. Leclerc — garden centre
Mon–Fri 09:00–19:30, Sat 09:00–19:00 · 6 km
Gamm Vert — garden centre
Mon–Sat 09:00–12:00, 14:00–19:00 · 10 km
Marché de la Calende — market
Place de la Calende, 76000 Rouen · Tue 08:00–18:00; Fri 08:00–18:00 · 0 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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