When to plant zucchini in Olsztyn: 9 June – 30 August

In Olsztyn, zucchini: sow for seedlings from 28 April to 9 August; plant into a greenhouse from 19 May to 30 August; plant out into open ground from 9 June to 30 August.

Zucchini 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 18 °C — the minimum on the zucchini card — only around 9 June, 42 days later.

Last spring frost	28 April
Top 7 cm of soil at 18 °C	9 June, 42 days after the last frost
First autumn frost	16 November, 160 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	15 July – 5 October
Days left for picking	124
Daylight	16:08 on 19 May, 16:57 on 9 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 10 rainy days

The same dates in Olsztyn hold for Cucumber, Bell Pepper, Eggplant, Pumpkin and Watermelon.

Zucchini in Olsztyn: care after planting

Planted on 9 June: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Olsztyn during the zucchini season

About 390 mm of rain falls in the season; November is the driest month (43 mm) and July the wettest (97 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
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

Zucchini in nearby cities

Around Olsztyn, Toruń is 6 days earlier and Gdańsk 6 days later.

City	Distance	Date	Difference
Kaliningrad	103 km	14 June – 28 August	5 days later
Gdańsk	135 km	15 June – 2 September	6 days later
Toruń	151 km	3 June – 26 August	6 days earlier
Gdynia	151 km	7 June – 2 September	2 days earlier
Warsaw	176 km	6 June – 31 August	3 days earlier
Bydgoszcz	179 km	6 June – 26 August	3 days earlier

Where to buy zucchini plants and seeds near Olsztyn

Buy plants ready to set out from 9 June to 30 August (from 19 May to 30 August for an unheated greenhouse); seed for raising your own is sown from 28 April to 9 August. Within 15 km of Olsztyn OpenStreetMap lists 2 garden centres, 1 plant nursery, 5 markets and 2 farm shops (collected 28 October 2026).

Targowisko przy ul. Kolejowej — market
Mon–Sat 06:00–16:00 · 1 km · zdzit.olsztyn.eu
Stodoła "Mój Rynek" — market
Sat 09:00–14:00 · 6 km
Sezonowa sprzedaż owoców i warzyw — farm shop
4 km
Stragan z warzywami — farm shop
5 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.

Questions