When to plant tomatoes in Strasbourg: 12 May – 31 July

In Strasbourg, tomato: sow for seedlings from 28 February to 9 June; plant into a greenhouse from 21 April to 31 July; plant out into open ground from 12 May to 31 July. For plants and seeds, the places nearby include Botanic (garden centre, 3 km) and Tropix (garden centre, 4 km); addresses and opening hours are below.

Tomato in Strasbourg: soil, season and weather

In Strasbourg 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 12 May, 36 days later.

Last spring frost	6 April
Top 7 cm of soil at 15 °C	12 May, 36 days after the last frost
Into an unheated greenhouse	21 April – 31 July; April outside: 5.5 °C at night, 16.3 °C by day; card 16–27 °C
First autumn frost	20 November, 192 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	21 July – 9 October
Days left for picking	122
Daylight	12:11 on 21 March, 15:05 on 12 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 10 rainy days

Tomato in Strasbourg: care after planting

Planted on 12 May: in the first weeks water every 4 days.

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

12 May — feed: balanced (NPK)
9 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 Strasbourg during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, July, averages 26.2 °C. Months that stay below 16 °C even by day on average: November (9.7 °C). Nights average below 16 °C in May, June and September–November (3.7–14.9 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	20	9.9	81	13	15:13
June	25.2	14.9	81	13	16:06
July	26.2	16	78	11	15:45
August	26.2	16	66	11	14:24
September	22.1	12.5	65	10	12:39
October	16.7	8.6	77	13	10:53
November	9.7	3.7	75	13	9:14

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Strasbourg, Karlsruhe is 2 days earlier and Colmar 19 days later.

City	Distance	Date	Difference
Colmar	62 km	31 May – 28 July	19 days later
Freiburg im Breisgau	65 km	13 May – 27 July	1 day later
Karlsruhe	68 km	10 May – 30 July	2 days earlier
Saarbrücken	93 km	14 May – 29 July	2 days later
Mulhouse	96 km	13 May – 28 July	1 day later
Stuttgart	108 km	18 May – 19 July	6 days later

Where to buy tomato plants and seeds near Strasbourg

Buy plants ready to set out from 12 May to 31 July (from 21 April to 31 July for an unheated greenhouse); seed for raising your own is sown from 28 February to 9 June. Within 15 km of Strasbourg OpenStreetMap lists 15 garden centres, 13 markets and 31 farm shops (collected 20 October 2026).

Botanic — garden centre
Route d'Oberhausbergen 1, 67200 Strasbourg · Mon–Sat 09:00–19:00 · 3 km · botanic.com
Gartenzeiten Schwarz — garden centre
Rastatter Straße 50, 77694 Kehl · Mon–Fri 08:00–12:00, 13:00–18:00; Sat 09:00–14:00 · 11 km · gartenzeiten-schwarz.de
Tropix — garden centre
Route des Romains 222, 67200 Strasbourg · Mon–Fri 08:30–12:00, 13:30–18:30; Sat 08:30–18:00; Sun 10:00–12:00 · 4 km · tropix.fr
1A Garten Hopp — garden centre
Querbacher Straße 44, 77694 Kehl · Mon–Fri 08:00–12:30; 13:30–18:00; Sat 08:00–13:00 · 9 km · 1a-garten-hopp.de

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