When to plant watermelons in Trieste: 5 June – 19 August

In Trieste, watermelon: sow for seedlings from 17 April to 22 July; plant into a greenhouse from 15 May to 19 August; plant out into open ground from 5 June to 19 August.

Watermelon in Trieste: soil, season and weather

In Trieste the soil, not frost, sets the date: the last frost is over around 19 March, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 5 June, 78 days later.

Last spring frost	19 March
Top 7 cm of soil at 18 °C	5 June, 78 days after the last frost
Into an unheated greenhouse	15 May – 19 August; May outside: 10.8 °C at night, 18.5 °C by day; card 18–35 °C
First autumn frost	28 November, 176 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	3 August – 17 October
Days left for picking	117
Daylight	14:36 on 8 May, 15:32 on 5 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, June, has 9 rainy days

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

Watermelon in Trieste: care after planting

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

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

5 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 Trieste during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 26.9 °C. Months that stay below 18 °C even by day on average: October (16.9 °C) and November (11.2 °C). Nights average below 18 °C in June, July and September–November (5.6–17.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	24.3	16	90	9	15:41
July	26.5	17.8	105	9	15:22
August	26.9	18.1	95	7	14:10
September	21.7	14.1	189	11	12:35
October	16.9	10	175	12	11:00
November	11.2	5.6	189	14	9:31

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Trieste, Padua is 21 days earlier and Klagenfurt 28 days later.

City	Distance	Date	Difference
Udine	63 km	23 May – 13 August	13 days earlier
Venice	115 km	16 May – 27 August	20 days earlier
Klagenfurt	115 km	3 July – 27 July	28 days later
Treviso	120 km	19 May – 14 August	17 days earlier
Padua	150 km	15 May – 19 August	21 days earlier
Zagreb	172 km	28 May – 13 August	8 days earlier

Where to buy watermelon plants and seeds near Trieste

Buy plants ready to set out from 5 June to 19 August (from 15 May to 19 August for an unheated greenhouse); seed for raising your own is sown from 17 April to 22 July. Within 15 km of Trieste OpenStreetMap lists 19 garden centres, 2 farm-supply shops, 1 plant nursery, 9 markets and 3 farm shops (collected 20 October 2026).

The Tree Nursery — plant nursery
9 km
Agraria SKDN — farm supply
12 km
Market — market
12 km
Mercato Ittico all'Ingrosso — market
2 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