When to plant watermelons in Tortosa: from 7 May

In Tortosa, watermelon: sow for seedlings from 19 March; plant into a greenhouse from 16 April; plant out into open ground from 7 May. There is no autumn frost here, so the frost dates set no end to the window.

Watermelon in Tortosa: soil, season and weather

In Tortosa the soil, not frost, sets the date: the last frost is over around 16 January, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 7 May, 111 days later. Tortosa has no autumn frost in the median year, so frost does not end the season.

Last spring frost	16 January
Top 7 cm of soil at 18 °C	7 May, 111 days after the last frost
Into an unheated greenhouse	from 16 April; April outside: 9.5 °C at night, 19.8 °C by day; card 18–35 °C
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	from 5 July
Daylight	13:01 on 9 April, 14:10 on 7 May
Watering outdoors when fruiting (card)	every 5 days; the driest month, August, has 4 rainy days

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

Watermelon in Tortosa: care after planting

Planted on 7 May: in the first weeks water every 5 days.

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

7 May — 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 Tortosa during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 31.7 °C. Nights average below 18 °C in May, June and September, October (13.1–17.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	23.8	13.1	45	8	14:26
June	28.4	17.8	32	5	15:05
July	31.2	20.3	24	3	14:50
August	31.7	20.8	20	4	13:50
September	27.3	17.4	62	8	12:31
October	23.4	13.8	104	8	11:10

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Tortosa, Castellón de la Plana is 23 days earlier and Teruel 36 days later.

City	Distance	Date	Difference
Tarragona	70 km	from 30 April	7 days earlier
Lleida	90 km	29 April – 9 September	8 days earlier
Castellón de la Plana	103 km	from 14 April	23 days earlier
Teruel	147 km	12 June – 29 July	36 days later
Manresa	150 km	13 May – 23 August	6 days later
Zaragoza	150 km	30 April – 10 September	7 days earlier

Where to buy watermelon plants and seeds near Tortosa

Buy plants ready to set out from 7 May (from 16 April for an unheated greenhouse); seed for raising your own is sown from 19 March. Within 15 km of Tortosa OpenStreetMap lists 2 garden centres, 4 farm-supply shops, 3 markets and 1 farm shop (collected 28 October 2026).

Agrobotiga els tarongers — farm supply
10 km
ARROCERAS HERBA — farm supply
11 km
Mercat Central — market
0 km
Mercat Municipal d'Amposta — market
12 km

Questions