When to plant tomatoes in Rouen: 14 May – 1 August

In Rouen, tomato: sow for seedlings from 2 March to 10 June; plant into a greenhouse from 23 April to 1 August; plant out into open ground from 14 May to 1 August. For plants and seeds, the places nearby include E.Leclerc Jardi (garden centre, 4 km) and Truffaut (garden centre, 6 km); addresses and opening hours are below.

Tomato 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 15 °C — the minimum on the tomato card — only around 14 May, 38 days later.

Last spring frost	6 April
Top 7 cm of soil at 15 °C	14 May, 38 days after the last frost
Into an unheated greenhouse	23 April – 1 August; April outside: 5.1 °C at night, 14.5 °C by day; card 16–27 °C
First autumn frost	21 November, 191 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	23 July – 10 October
Days left for picking	121
Daylight	12:19 on 23 March, 15:17 on 14 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, August, has 11 rainy days

Tomato in Rouen: care after planting

Planted on 14 May: in the first weeks water every 4 days.

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

14 May — feed: balanced (NPK)
11 June — feed: nitrogen

Pests and diseases of tomato 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 tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, July, averages 23 °C. Months that stay below 16 °C even by day on average: November (10.7 °C). Nights average below 16 °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
May	17.7	8.6	71	12	15:19
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

Tomato in nearby cities

Around Rouen, Le Mans is 6 days earlier and Brighton 35 days later.

City	Distance	Date	Difference
Le Havre	72 km	11 May – 22 August	3 days earlier
Amiens	100 km	17 May – 1 August	3 days later
Caen	109 km	21 May – 15 August	7 days later
Paris	111 km	11 May – 31 July	3 days earlier
Le Mans	173 km	8 May – 4 August	6 days earlier
Brighton	178 km	18 June – 11 August	35 days later

Where to buy tomato plants and seeds near Rouen

Buy plants ready to set out from 14 May to 1 August (from 23 April to 1 August for an unheated greenhouse); seed for raising your own is sown from 2 March to 10 June. Within 15 km of Rouen OpenStreetMap lists 8 garden centres, 18 markets and 15 farm shops (collected 27 October 2026).

Truffaut — garden centre
Route de Neufchâtel 100, 76230 Isneauville · Mon–Sun 09:30–19:00 · 6 km · truffaut.com
Jardinerie Poullain — garden centre
Rue Jehan Ango 304, 76520 Franqueville-Saint-Pierre · Mon–Sun 09:30–12:30, 14:00–19:00 · 6 km · club-poullain.com
E.Leclerc Jardi — garden centre
Rue du Canal 40, 76380 Canteleu · Mon–Thu 09:00–19:15; Fri 09:00–19:30; Sat 09:00–19:00; Sun 10:00–12:30, 14:30–18:30 · 4 km · e-leclerc.com
Truffaut — garden centre
Boulevard de l'Europe, 76360 Barentin · Mon–Sat 09:30–19:00; Sun 10:00–12:30, 14:00–18:30 · 14 km · truffaut.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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