When to plant watermelons in Rostock: 11 June – 8 August

In Rostock, watermelon: sow for seedlings from 23 April to 11 July; plant into a greenhouse from 21 May to 8 August; plant out into open ground from 11 June to 8 August.

Watermelon in Rostock: soil, season and weather

In Rostock the soil, not frost, sets the date: the last frost is over around 14 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 11 June, 58 days later.

Last spring frost	14 April
Top 7 cm of soil at 18 °C	11 June, 58 days after the last frost
Into an unheated greenhouse	21 May – 8 August; May outside: 8.1 °C at night, 17.2 °C by day; card 18–35 °C
First autumn frost	17 November, 159 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	9 August – 6 October
Days left for picking	100
Daylight	15:55 on 14 May, 17:04 on 11 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, November, has 11 rainy days

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

Watermelon in Rostock: care after planting

Planted on 11 June: in the first weeks water every 5 days.

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

11 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 Rostock during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 22.7 °C. Months that stay below 18 °C even by day on average: October (13.9 °C) and November (8 °C). Nights average below 18 °C in every month of the season, from 3.4 °C to 13.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	21.6	12.3	67	11	17:08
July	22	13.8	83	14	16:40
August	22.7	13.9	62	12	14:55
September	19.4	11.3	56	9	12:46
October	13.9	7.9	68	14	10:38
November	8	3.4	49	11	8:34

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Rostock, Berlin is 11 days earlier and Kiel 8 days later.

City	Distance	Date	Difference
Kiel	130 km	19 June – 11 August	8 days later
Hamburg	151 km	6 June – 10 August	5 days earlier
Szczecin	177 km	5 June – 8 August	6 days earlier
Copenhagen	179 km	9 June – 10 August	2 days earlier
Berlin	195 km	31 May – 10 August	11 days earlier
Potsdam	198 km	3 June – 12 August	8 days earlier

Where to buy watermelon plants and seeds near Rostock

Buy plants ready to set out from 11 June to 8 August (from 21 May to 8 August for an unheated greenhouse); seed for raising your own is sown from 23 April to 11 July. Within 15 km of Rostock OpenStreetMap lists 5 garden centres, 4 plant nurseries, 13 markets and 8 farm shops (collected 28 October 2026).

Baumschule Hinrichshagen — plant nursery
13 km
Emaillewerk — market
12 km
Arbeitsstätte "In der Lehmkuhl" — farm shop
13 km · ggp-gruppe.de
Hofladen Bio- und Erlebnisgärtnerei Rohde — farm shop
3 km · bio-rohde.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