When to plant cucumbers in Białystok: 8 June – 17 August

In Białystok, cucumber: sow for seedlings from 20 April to 20 July; plant into a greenhouse from 18 May to 17 August; plant out into open ground from 8 June to 17 August. For plants and seeds, the places nearby include U Basi (garden centre, 4 km) and Lasbud (garden centre, 6 km); addresses and opening hours are below.

Cucumber 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 cucumber 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 – 17 August; May outside: 7.5 °C at night, 18.4 °C by day; card 18–25 °C
First autumn frost	1 November, 146 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	12 July – 20 September
Days left for picking	112
Daylight	15:36 on 11 May, 16:48 on 8 June
Watering outdoors when fruiting (card)	every 2 days; the driest month, November, has 10 rainy days

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

Cucumber in Białystok: care after planting

Planted on 8 June: in the first weeks water every 4 days.

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

15 June — feed: nitrogen

Pests and diseases of cucumber 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 cucumber season

No month of the season averages above the cucumber 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

Cucumber in nearby cities

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

City	Distance	Date	Difference
Grodno	76 km	8 June – 24 August	same day
Brest	120 km	4 June – 29 August	4 days earlier
Lida	164 km	11 June – 15 August	3 days later
Warsaw	176 km	6 June – 2 September	2 days earlier
Baranovichi	190 km	11 June – 12 August	3 days later
Olsztyn	192 km	9 June – 1 September	1 day later

Where to buy cucumber plants and seeds near Białystok

Buy plants ready to set out from 8 June to 17 August (from 18 May to 17 August for an unheated greenhouse); seed for raising your own is sown from 20 April to 20 July. Within 15 km of Białystok OpenStreetMap lists 8 garden centres, 1 plant nursery and 8 markets (collected 28 October 2026).

U Basi — garden centre
Władysława Wysockiego 80, Białystok · 4 km
AMAGER s.j.Artykuły Ogrodnicze i Rolnicze — garden centre
Warszawska 76, 16-070 Łyski · 9 km
Lasbud — garden centre
Szosa Baranowicka 39, 15-521 Zaścianki · 6 km
Skład drewna ,galanteria ogrodowa — garden centre
Zagórki 2, Białystok · 7 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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