When to plant tomatoes in Białystok: 17 May – 12 July

In Białystok, tomato: sow for seedlings from 5 March to 21 May; plant into a greenhouse from 26 April to 12 July; plant out into open ground from 17 May to 12 July. For plants and seeds, the places nearby include Green Serwis (garden centre, 3 km) and Euro Ogród (garden centre, 3 km); addresses and opening hours are below.

Tomato 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 15 °C — the minimum on the tomato card — only around 17 May, 19 days later.

Last spring frost	28 April
Top 7 cm of soil at 15 °C	17 May, 19 days after the last frost
Into an unheated greenhouse	26 April – 12 July; April outside: 3 °C at night, 13.2 °C by day; card 16–27 °C
First autumn frost	1 November, 168 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	26 July – 20 September
Days left for picking	98
Daylight	12:34 on 26 March, 15:56 on 17 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 10 rainy days

Tomato in Białystok: care after planting

Planted on 17 May: in the first weeks water every 4 days.

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

17 May — feed: balanced (NPK)
14 June — feed: nitrogen

Pests and diseases of tomato 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 tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, August, averages 24.1 °C. Months that stay below 16 °C even by day on average: October (12.5 °C) and November (5.8 °C). Nights average below 16 °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
May	18.4	7.5	67	12	15:49
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

Tomato in nearby cities

Around Białystok, Warsaw is 5 days earlier and Lida 8 days later.

City	Distance	Date	Difference
Grodno	76 km	24 May – 19 July	7 days later
Brest	120 km	14 May – 24 July	3 days earlier
Lida	164 km	25 May – 10 July	8 days later
Warsaw	176 km	12 May – 28 July	5 days earlier
Baranovichi	190 km	23 May – 7 July	6 days later
Olsztyn	192 km	22 May – 27 July	5 days later

Where to buy tomato plants and seeds near Białystok

Buy plants ready to set out from 17 May to 12 July (from 26 April to 12 July for an unheated greenhouse); seed for raising your own is sown from 5 March to 21 May. Within 15 km of Białystok OpenStreetMap lists 8 garden centres, 1 plant nursery and 8 markets (collected 28 October 2026).

Euro Ogród — garden centre
Generała Józefa Hallera 31, 15-814 Białystok · Mon–Fri 09:00–17:00; Sat 09:00–14:00; Sun closed · 3 km · euroogrod.com.pl
Gardens s.c. Davis, Kryjan — garden centre
Kwiatowa 7, 16-010 Nowodworce · Mon–Fri 08:00–18:00; Sat 08:00–15:00 · 9 km · dkgardens.pl
Ogrody Marka — garden centre
Generała Stanisława Maczka, Białystok · 5 km · ogrodymarka.pl
Green Serwis — garden centre
Konstantego Ciołkowskiego 99, Białystok · 3 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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