When to plant tomatoes in Olsztyn: 22 May – 27 July

In Olsztyn, tomato: sow for seedlings from 10 March to 5 June; plant into a greenhouse from 1 May to 27 July; plant out into open ground from 22 May to 27 July. For plants and seeds, the places nearby include Olkwiat (garden centre, 1 km) and Sklep Ogrodniczy (garden centre, 1 km); addresses and opening hours are below.

Tomato in Olsztyn: soil, season and weather

In Olsztyn 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 22 May, 24 days later.

Last spring frost	28 April
Top 7 cm of soil at 15 °C	22 May, 24 days after the last frost
Into an unheated greenhouse	1 May – 27 July; May outside: 7.2 °C at night, 17.7 °C by day; card 16–27 °C
First autumn frost	16 November, 178 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	31 July – 5 October
Days left for picking	108
Daylight	12:56 on 31 March, 16:17 on 22 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 10 rainy days

Tomato in Olsztyn: care after planting

Planted on 22 May: in the first weeks water every 4 days.

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

22 May — feed: balanced (NPK)
19 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 Olsztyn during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, August, averages 23.4 °C. Months that stay below 16 °C even by day on average: October (12.7 °C) and November (6.2 °C). Nights average below 16 °C in every month of the season, from 1.9 °C to 13.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	17.7	7.2	71	11	15:55
June	22.8	12.5	64	11	17:04
July	22.9	13.9	97	16	16:36
August	23.4	13.9	68	11	14:53
September	19.2	10.6	54	10	12:46
October	12.7	6	64	13	10:39
November	6.2	1.9	43	10	8:37

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Olsztyn, Toruń is 11 days earlier and Gdańsk 2 days later.

City	Distance	Date	Difference
Kaliningrad	103 km	23 May – 25 July	1 day later
Gdańsk	135 km	24 May – 30 July	2 days later
Toruń	151 km	11 May – 23 July	11 days earlier
Gdynia	151 km	15 May – 30 July	7 days earlier
Warsaw	176 km	12 May – 28 July	10 days earlier
Bydgoszcz	179 km	12 May – 23 July	10 days earlier

Where to buy tomato plants and seeds near Olsztyn

Buy plants ready to set out from 22 May to 27 July (from 1 May to 27 July for an unheated greenhouse); seed for raising your own is sown from 10 March to 5 June. Within 15 km of Olsztyn OpenStreetMap lists 2 garden centres, 1 plant nursery, 5 markets and 2 farm shops (collected 28 October 2026).

Olkwiat — garden centre
Stefana Okrzei 6, Olsztyn · 1 km · olkwiat.pl
Sklep Ogrodniczy — garden centre
Mon, Wed–Thu 08:00–15:00; Tue, Fri 07:30–14:30; Sat 07:30–13:00; Sun closed · 1 km
Szkółka Roślin "Topa" — plant nursery
Sielska 45, 10-041 Olsztyn · 5 km · szkolkatopa.olsztyn.pl
Targowisko przy ul. Grunwaldzkiej — market
Tue, Fri, Sat 06:00–14:00 · 1 km · zdzit.olsztyn.eu

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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