When to plant tomatoes in Duisburg: 10 May – 2 August

In Duisburg, tomato: sow for seedlings from 26 February to 11 June; plant into a greenhouse from 19 April to 2 August; plant out into open ground from 10 May to 2 August. For plants and seeds, the places nearby include Speldorfer Pflanzenmarkt (garden centre, 6 km) and Staudengärtnerei Diamant (garden centre, 9 km); addresses and opening hours are below.

Tomato in Duisburg: soil, season and weather

In Duisburg the soil, not frost, sets the date: the last frost is over around 5 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 10 May, 35 days later.

Last spring frost	5 April
Top 7 cm of soil at 15 °C	10 May, 35 days after the last frost
Into an unheated greenhouse	19 April – 2 August; April outside: 5.3 °C at night, 14.6 °C by day; card 16–27 °C
First autumn frost	22 November, 196 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	19 July – 11 October
Days left for picking	126
Daylight	12:04 on 19 March, 15:19 on 10 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, May, has 11 rainy days

Tomato in Duisburg: care after planting

Planted on 10 May: in the first weeks water every 4 days.

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

10 May — feed: balanced (NPK)
7 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 Duisburg during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, August, averages 24 °C. Months that stay below 16 °C even by day on average: October (15.6 °C) and November (9.8 °C). Nights average below 16 °C in every month of the season, from 4.6 °C to 15 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19.1	9.5	62	11	15:35
June	23.2	13.8	75	12	16:36
July	23.7	14.8	69	13	16:11
August	24	15	62	13	14:39
September	20.5	12.2	74	12	12:42
October	15.6	9.3	79	13	10:46
November	9.8	4.6	69	14	8:55

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

1 of the nearest cities share Duisburg's date.

City	Distance	Date	Difference
Essen	18 km	11 May – 1 August	1 day later
Düsseldorf	22 km	10 May – 1 August	same day
Bochum	32 km	13 May – 31 July	3 days later
Dortmund	50 km	16 May – 27 July	6 days later
Cologne	56 km	12 May – 31 July	2 days later
Bonn	81 km	16 May – 30 July	6 days later

Where to buy tomato plants and seeds near Duisburg

Buy plants ready to set out from 10 May to 2 August (from 19 April to 2 August for an unheated greenhouse); seed for raising your own is sown from 26 February to 11 June. Within 15 km of Duisburg OpenStreetMap lists 44 garden centres, 3 farm-supply shops, 5 plant nurseries, 35 markets and 27 farm shops (collected 28 October 2026).

Speldorfer Pflanzenmarkt — garden centre
Duisburger Straße 199, 45478 Mülheim an der Ruhr · Mon–Fri 09:00–18:00; Sat 09:00–16:00; Sun 10:30–12:30 · 6 km · gartenlandteiking.de
Staudengärtnerei Diamant — garden centre
Mühlenweg 39, 47239 Duisburg · Mar–Jul Thu, Fri 09:00–12:00; Mar–Jul Thu, Fri 14:00–18:00; Mar–Jul Sat 09:00–14:00; Sept–Oct Thu, Fri 09:00–12:00; Sept–Oct Thu, Fri 14:00–18:00; Sept–Oct Sat 09:00–14:00 · 9 km · stauden-diamant.de
Baumschule Hesselmann — garden centre
Baumschulenweg 2, 40885 Ratingen · Mon–Fri 09:00–17:00; Sat 09:00–13:00 · 10 km · hesselmann-baumschulen.de
Schley's Blumenparadies — garden centre
Kölner Straße 81, 40885 Ratingen · Mon–Fri 09:00 - 19:00, Sat 08:30 - 18:00, Su10:30 - 15:30 · 12 km · blumenparadies.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.

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