When to plant watermelons in Duisburg: 3 June – 13 August

In Duisburg, watermelon: sow for seedlings from 15 April to 16 July; plant into a greenhouse from 13 May to 13 August; plant out into open ground from 3 June to 13 August.

Watermelon 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 18 °C — the minimum on the watermelon card — only around 3 June, 59 days later.

Last spring frost	5 April
Top 7 cm of soil at 18 °C	3 June, 59 days after the last frost
Into an unheated greenhouse	13 May – 13 August; May outside: 9.5 °C at night, 19.1 °C by day; card 18–35 °C
First autumn frost	22 November, 172 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	1 August – 11 October
Days left for picking	113
Daylight	15:06 on 6 May, 16:21 on 3 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, August, has 13 rainy days

The same dates in Duisburg hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Duisburg: care after planting

Planted on 3 June: in the first weeks water every 5 days.

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

3 June — feed: balanced (NPK)

Pests and diseases of watermelon 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 watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 24 °C. Months that stay below 18 °C even by day on average: October (15.6 °C) and November (9.8 °C). Nights average below 18 °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
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

Watermelon in nearby cities

4 of the nearest cities share Duisburg's date.

City	Distance	Date	Difference
Essen	18 km	3 June – 12 August	same day
Düsseldorf	22 km	3 June – 12 August	same day
Bochum	32 km	3 June – 11 August	same day
Dortmund	50 km	5 June – 7 August	2 days later
Cologne	56 km	3 June – 11 August	same day
Bonn	81 km	4 June – 10 August	1 day later

Where to buy watermelon plants and seeds near Duisburg

Buy plants ready to set out from 3 June to 13 August (from 13 May to 13 August for an unheated greenhouse); seed for raising your own is sown from 15 April to 16 July. 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).

Wochenmarkt — market
Am Markt, 47506 Neukirchen-Vluyn · Sat 07:30–13:00; Wed 07:30–13:00 · 14 km
Wochenmarkt Wedau — market
Wedauer Markt, 47279 Duisburg · Wed, Fri 08:00–13:00 · 5 km
Wochenmarkt Bruckhausen — market
Fri 08:00–13:00; Mon–Thu closed; Sat–Sun closed · 7 km
Altmarkt — market
24/7 · 8 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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