When to plant watermelons in Bydgoszcz: 6 June – 3 August

In Bydgoszcz, watermelon: sow for seedlings from 18 April to 6 July; plant into a greenhouse from 16 May to 3 August; plant out into open ground from 6 June to 3 August. For plants and seeds, the places nearby include GRENE (farm supply, 4 km); addresses and opening hours are below.

Watermelon in Bydgoszcz: soil, season and weather

In Bydgoszcz the soil, not frost, sets the date: the last frost is over around 20 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 6 June, 47 days later.

Last spring frost	20 April
Top 7 cm of soil at 18 °C	6 June, 47 days after the last frost
Into an unheated greenhouse	16 May – 3 August; May outside: 8.3 °C at night, 18.9 °C by day; card 18–35 °C
First autumn frost	12 November, 159 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	4 August – 1 October
Days left for picking	100
Daylight	15:29 on 9 May, 16:45 on 6 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, November, has 9 rainy days

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

Watermelon in Bydgoszcz: care after planting

Planted on 6 June: in the first weeks water every 5 days.

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

6 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 Bydgoszcz during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 24.4 °C. Months that stay below 18 °C even by day on average: October (13.9 °C) and November (7.3 °C). Nights average below 18 °C in every month of the season, from 2.4 °C to 14.6 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	24	13.4	70	10	16:55
July	24	14.5	94	13	16:29
August	24.4	14.6	64	9	14:49
September	20.1	11.4	51	8	12:45
October	13.9	7	58	11	10:41
November	7.3	2.4	40	9	8:42

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Bydgoszcz, Toruń is 3 days earlier and Gdańsk 9 days later.

City	Distance	Date	Difference
Toruń	41 km	3 June – 3 August	3 days earlier
Poznań	107 km	6 June – 7 August	same day
Gdańsk	143 km	15 June – 10 August	9 days later
Gdynia	159 km	7 June – 10 August	1 day later
Olsztyn	179 km	9 June – 7 August	3 days later
Łódź	180 km	6 June – 26 July	same day

Where to buy watermelon plants and seeds near Bydgoszcz

Buy plants ready to set out from 6 June to 3 August (from 16 May to 3 August for an unheated greenhouse); seed for raising your own is sown from 18 April to 6 July. Within 15 km of Bydgoszcz OpenStreetMap lists 7 garden centres, 1 farm-supply shop, 2 plant nurseries and 9 markets (collected 28 October 2026).

GRENE — farm supply
Towarowa 36, 85-746 Bydgoszcz · 4 km · grene.pl
Centrum Ogrodnicze Rolpest — garden centre
10 km · rolpest.pl
Ogrodnictwo Juszczak — garden centre
13 km
Nadleśnictwo Żołędowo - Leśnictwo Szkółka Leśna Tryszczyn — plant nursery
8 km · zoledowo.torun.lasy.gov.pl

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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