When to plant watermelons in Białystok: 8 June – 23 July

In Białystok, watermelon: sow for seedlings from 20 April to 25 June; plant into a greenhouse from 18 May to 23 July; plant out into open ground from 8 June to 23 July. For plants and seeds, the places nearby include Skład drewna ,galanteria ogrodowa (garden centre, 7 km); addresses and opening hours are below.

Watermelon in Białystok: soil, season and weather

In Białystok the soil, not frost, sets the date: the last frost is over around 28 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 8 June, 41 days later.

Last spring frost	28 April
Top 7 cm of soil at 18 °C	8 June, 41 days after the last frost
Into an unheated greenhouse	18 May – 23 July; May outside: 7.5 °C at night, 18.4 °C by day; card 18–35 °C
First autumn frost	1 November, 146 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	6 August – 20 September
Days left for picking	87
Daylight	15:36 on 11 May, 16:48 on 8 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, November, has 10 rainy days

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

Watermelon in Białystok: care after planting

Planted on 8 June: in the first weeks water every 5 days.

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

8 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 Białystok during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 24.1 °C. Months that stay below 18 °C even by day on average: October (12.5 °C) and November (5.8 °C). Nights average below 18 °C in every month of the season, from 1.2 °C to 14.2 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	23.6	12.8	69	11	16:55
July	23.7	14.2	101	15	16:29
August	24.1	13.8	65	11	14:49
September	19.2	10.2	58	9	12:45
October	12.5	5.5	68	12	10:41
November	5.8	1.2	45	10	8:42

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Białystok, Brest is 4 days earlier and Lida 3 days later.

City	Distance	Date	Difference
Grodno	76 km	8 June – 30 July	same day
Brest	120 km	4 June – 4 August	4 days earlier
Lida	164 km	11 June – 21 July	3 days later
Warsaw	176 km	6 June – 8 August	2 days earlier
Baranovichi	190 km	11 June – 18 July	3 days later
Olsztyn	192 km	9 June – 7 August	1 day later

Where to buy watermelon plants and seeds near Białystok

Buy plants ready to set out from 8 June to 23 July (from 18 May to 23 July for an unheated greenhouse); seed for raising your own is sown from 20 April to 25 June. Within 15 km of Białystok OpenStreetMap lists 8 garden centres, 1 plant nursery and 8 markets (collected 28 October 2026).

Skład drewna ,galanteria ogrodowa — garden centre
Zagórki 2, Białystok · 7 km
Podlaskie Centrum Rolno-Towarowe S.A. — market
Generała Władysława Andersa 40, Białystok · Mon–Sat 06:00–14:00 · 3 km · podlaskiecentrum.pl
"Fasty" Rynek Hurtowy Rolno-Spożywczy — market
Szosa Knyszyńska, 15-694 Fasty · 7 km · rynek-fasty.home.pl
Centrum Handlowe Hetman — market
Kawaleryjska, Białystok · 3 km · hetman.bialystok.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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