When to plant watermelons in Cluj-Napoca: 6 June – 31 July

In Cluj-Napoca, watermelon: sow for seedlings from 18 April to 3 July; plant into a greenhouse from 16 May to 31 July; plant out into open ground from 6 June to 31 July.

Watermelon in Cluj-Napoca: soil, season and weather

In Cluj-Napoca the soil, not frost, sets the date: the last frost is over around 17 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 6 June, 50 days later.

Last spring frost	17 April
Top 7 cm of soil at 18 °C	6 June, 50 days after the last frost
Into an unheated greenhouse	16 May – 31 July; May outside: 9 °C at night, 19.5 °C by day; card 18–35 °C
First autumn frost	9 November, 156 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	4 August – 28 September
Days left for picking	97
Daylight	14:45 on 9 May, 15:42 on 6 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, October, has 8 rainy days

The same dates in Cluj-Napoca hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Cluj-Napoca: care after planting

Planted on 6 June: in the first weeks water every 5 days.

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

6 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 Cluj-Napoca during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 26.8 °C. Months that stay below 18 °C even by day on average: October (15.8 °C) and November (9.5 °C). Nights average below 18 °C in every month of the season, from 2 °C to 15.3 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	24.6	14	103	14	15:50
July	26.1	15.2	83	12	15:31
August	26.8	15.3	57	8	14:15
September	21.7	11.4	64	8	12:37
October	15.8	6.2	48	8	10:58
November	9.5	2	55	10	9:25

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Cluj-Napoca, Uzhhorod is 10 days earlier and Drohobych 6 days later.

City	Distance	Date	Difference
Mukachevo	197 km	11 June – 14 July	5 days later
Uzhhorod	227 km	27 May – 22 July	10 days earlier
Chernivtsi	245 km	2 June – 12 July	4 days earlier
Ivano-Frankivsk	253 km	5 June – 11 July	1 day earlier
Kalush	257 km	11 June – 11 July	5 days later
Drohobych	287 km	12 June – 12 July	6 days later

Where to buy watermelon plants and seeds near Cluj-Napoca

Buy plants ready to set out from 6 June to 31 July (from 16 May to 31 July for an unheated greenhouse); seed for raising your own is sown from 18 April to 3 July. Within 15 km of Cluj-Napoca OpenStreetMap lists 4 garden centres, 2 farm-supply shops, 1 plant nursery, 13 markets and 2 farm shops (collected 28 October 2026).

Piața Zorilor — market
Strada Luceafărului 2, Cluj-Napoca · Mon–Sat 07:00–22:00; Sun 08:00–21:00 · 2 km
Piața agroalimentară Flora — market
Aleea Padin 15, Cluj-Napoca · Mon–Sat 07:00–21:00; Sun 07:00–14:00 · 3 km
Piața Agroalimentară Grigorescu — market
Strada Mirăslău, Cluj-Napoca · 2 km
Piața agroalimentară Mărăști — market
06:00–22:00 · 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.

Questions