When to plant watermelons in Stuttgart: 5 June – 30 July

In Stuttgart, watermelon: sow for seedlings from 17 April to 2 July; plant into a greenhouse from 15 May to 30 July; plant out into open ground from 5 June to 30 July.

Watermelon in Stuttgart: soil, season and weather

In Stuttgart the soil, not frost, sets the date: the last frost is over around 19 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 5 June, 47 days later.

Last spring frost	19 April
Top 7 cm of soil at 18 °C	5 June, 47 days after the last frost
Into an unheated greenhouse	15 May – 30 July; May outside: 8.2 °C at night, 18.7 °C by day; card 18–35 °C
First autumn frost	8 November, 156 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	3 August – 27 September
Days left for picking	97
Daylight	14:55 on 8 May, 15:59 on 5 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, October, has 12 rainy days

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

Watermelon in Stuttgart: care after planting

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

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

5 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 Stuttgart during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 25 °C. Months that stay below 18 °C even by day on average: October (16 °C) and November (9.1 °C). Nights average below 18 °C in every month of the season, from 2 °C to 14.4 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	23.9	13.1	88	14	16:08
July	24.9	14.2	78	13	15:47
August	25	14.4	84	12	14:25
September	20.8	10.7	70	11	12:39
October	16	7.1	66	12	10:53
November	9.1	2	66	13	9:13

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Stuttgart, Karlsruhe is 6 days earlier and St. Gallen 10 days later.

City	Distance	Date	Difference
Karlsruhe	62 km	30 May – 10 August	6 days earlier
Mannheim	94 km	1 June – 11 August	4 days earlier
Strasbourg	108 km	1 June – 11 August	4 days earlier
Freiburg im Breisgau	132 km	4 June – 7 August	1 day earlier
Augsburg	135 km	13 June – 31 July	8 days later
St. Gallen	152 km	15 June – 9 August	10 days later

Where to buy watermelon plants and seeds near Stuttgart

Buy plants ready to set out from 5 June to 30 July (from 15 May to 30 July for an unheated greenhouse); seed for raising your own is sown from 17 April to 2 July. Within 15 km of Stuttgart OpenStreetMap lists 34 garden centres, 2 farm-supply shops, 10 plant nurseries, 28 markets and 99 farm shops (collected 28 October 2026).

Wochenmarkt Vaihingen — market
Wed, Sat 07:00–12:30 · 8 km · stuttgarter-wochenmaerkte.de
Wochenmarkt Echterdingen — market
Wed 07:00–12:00; Sat 07:00–12:00 · 10 km · leinfelden-echterdingen.de
Marienplatz-Markt — market
Marienplatz · Wed 10:00–18:00 · 2 km
Wochenmarkt — market
Fri 10:00–17:00 · 2 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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