When to plant watermelons in Opole: 2 June – 9 August

In Opole, watermelon: sow for seedlings from 14 April to 12 July; plant into a greenhouse from 12 May to 9 August; plant out into open ground from 2 June to 9 August. For plants and seeds, the places nearby include Grene (farm supply, 3 km) and Bajek (garden centre, 6 km); addresses and opening hours are below.

Watermelon in Opole: soil, season and weather

In Opole the soil, not frost, sets the date: the last frost is over around 15 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 2 June, 48 days later.

Last spring frost	15 April
Top 7 cm of soil at 18 °C	2 June, 48 days after the last frost
Into an unheated greenhouse	12 May – 9 August; May outside: 8.9 °C at night, 19.1 °C by day; card 18–35 °C
First autumn frost	18 November, 169 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	31 July – 7 October
Days left for picking	110
Daylight	14:57 on 5 May, 16:12 on 2 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, November, has 10 rainy days

The same dates in Opole hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Opole: care after planting

Planted on 2 June: in the first weeks water every 5 days.

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

2 June — feed: balanced (NPK)

Pests and diseases of watermelon 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 Opole during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 25.1 °C. Months that stay below 18 °C even by day on average: October (14.8 °C) and November (8.2 °C). Nights average below 18 °C in every month of the season, from 2.5 °C to 15.3 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	24.5	14.1	75	11	16:27
July	24.9	15.1	97	13	16:04
August	25.1	15.3	83	12	14:35
September	20.7	11.6	66	11	12:41
October	14.8	7.2	67	13	10:48
November	8.2	2.5	55	10	9:00

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

All the nearest cities on our list plant watermelon later than Opole; the closest date is in Olomouc, 1 day later.

City	Distance	Date	Difference
Wrocław	79 km	5 June – 2 August	3 days later
Częstochowa	85 km	5 June – 1 August	3 days later
Katowice	90 km	6 June – 7 August	4 days later
Ostrava	97 km	8 June – 31 July	6 days later
Olomouc	130 km	3 June – 28 July	1 day later
Hradec Králové	157 km	7 June – 2 August	5 days later

Where to buy watermelon plants and seeds near Opole

Buy plants ready to set out from 2 June to 9 August (from 12 May to 9 August for an unheated greenhouse); seed for raising your own is sown from 14 April to 12 July. Within 15 km of Opole OpenStreetMap lists 4 garden centres, 2 farm-supply shops and 2 markets (collected 28 October 2026).

Szkółki Olszanowski - Drzewa, Krzewy, Byliny — garden centre
Szkolna 4, 46-022 Zawada · Mon–Fri 08:00–18:00; Sat 09:00–17:00 · 7 km · olszanowski.com.pl
Oaza-Palmy Sylwia Hennek — garden centre
Opolska 26, 46-061 Chrzowice · Mon–Fri 09:00–18:00 · 7 km · oaza-palmy.pl
Bajek — garden centre
Mon–Fri 08:00–18:00; Sat 08:00–14:00 · 6 km
Grene — farm supply
Budowlanych 50, 45-124 Opole · 3 km · grene.pl

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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