When to plant tomatoes in Gdynia: 15 May – 30 July

In Gdynia, tomato: sow for seedlings from 3 March to 8 June; plant into a greenhouse from 24 April to 30 July; plant out into open ground from 15 May to 30 July. For plants and seeds, the places nearby include Kaktusiarnia (garden centre, 11 km) and Cyrzan (garden centre, 11 km); addresses and opening hours are below.

Tomato in Gdynia: soil, season and weather

In Gdynia the soil, not frost, sets the date: the last frost is over around 13 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 15 May, 32 days later.

Last spring frost	13 April
Top 7 cm of soil at 15 °C	15 May, 32 days after the last frost
Into an unheated greenhouse	24 April – 30 July; April outside: 3.4 °C at night, 11.4 °C by day; card 16–27 °C
First autumn frost	19 November, 188 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	24 July – 8 October
Days left for picking	118
Daylight	12:26 on 24 March, 16:02 on 15 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 10 rainy days

Tomato in Gdynia: care after planting

Planted on 15 May: in the first weeks water every 4 days.

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

15 May — feed: balanced (NPK)
12 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 Gdynia during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, August, averages 22.4 °C. Months that stay below 16 °C even by day on average: October (13.1 °C) and November (7.1 °C). Nights average below 16 °C in every month of the season, from 3 °C to 14.7 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	16.1	7.7	54	11	16:02
June	21.1	12.8	64	13	17:13
July	21.7	14.4	111	15	16:45
August	22.4	14.7	73	13	14:58
September	18.6	11.8	51	10	12:47
October	13.1	7.5	68	13	10:36
November	7.1	3	55	11	8:31

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Gdynia, Toruń is 4 days earlier and Gdańsk 9 days later.

City	Distance	Date	Difference
Gdańsk	20 km	24 May – 30 July	9 days later
Kaliningrad	129 km	23 May – 25 July	8 days later
Olsztyn	151 km	22 May – 27 July	7 days later
Bydgoszcz	159 km	12 May – 23 July	3 days earlier
Toruń	168 km	11 May – 23 July	4 days earlier
Poznań	257 km	11 May – 27 July	4 days earlier

Where to buy tomato plants and seeds near Gdynia

Buy plants ready to set out from 15 May to 30 July (from 24 April to 30 July for an unheated greenhouse); seed for raising your own is sown from 3 March to 8 June. Within 15 km of Gdynia OpenStreetMap lists 9 garden centres, 1 farm-supply shop, 10 markets and 1 farm shop (collected 28 October 2026).

Kaktusiarnia — garden centre
Partyzantów 2, 84-230 · Mon–Fri 09:00–17:00; Sat 09:00–15:00 · 11 km · kaktusiarnia.pl
Cyrzan — garden centre
Mon–Fri 07:00–18:00; Sat 07:00–16:00; Sun 10:00–15:00 "W niedziele handlowe" · 11 km · cyrzan.com
Centrum Ogrodnicze Kubscy — garden centre
Galaktyczna 40, 80-299 Gdańsk · 12 km
Róża Melcer — garden centre
Kazimierska 100, 84-240 Reda · 15 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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