When to plant watermelons in León (Spain): 25 May – 30 July

In León (Spain), watermelon: sow for seedlings from 6 April to 2 July; plant into a greenhouse from 4 May to 30 July; plant out into open ground from 25 May to 30 July.

Watermelon in León (Spain): soil, season and weather

In León (Spain) the soil, not frost, sets the date: the last frost is over around 14 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 25 May, 41 days later.

Last spring frost	14 April
Top 7 cm of soil at 18 °C	25 May, 41 days after the last frost
Into an unheated greenhouse	4 May – 30 July; May outside: 7.6 °C at night, 20.9 °C by day; card 18–35 °C
First autumn frost	8 November, 167 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	23 July – 27 September
Days left for picking	108
Daylight	13:53 on 27 April, 14:55 on 25 May
Watering outdoors when fruiting (card)	every 5 days; the driest month, July, has 3 rainy days

The same dates in León (Spain) hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in León (Spain): care after planting

Planted on 25 May: in the first weeks water every 5 days.

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

25 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 León (Spain) during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 30.1 °C. Months that stay below 18 °C even by day on average: November (12.1 °C). Nights average below 18 °C in every month of the season, from 3.3 °C to 14.6 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	20.9	7.6	44	8	14:36
June	25.5	11.8	46	8	15:18
July	30.1	14.3	12	3	15:01
August	30.1	14.6	12	2	13:57
September	24.1	10.9	29	5	12:32
October	19.3	7.7	60	9	11:07
November	12.1	3.3	59	11	9:47

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around León (Spain), Zamora is 15 days earlier and Oviedo 25 days later.

City	Distance	Date	Difference
Ponferrada	84 km	1 June – 18 August	7 days later
Oviedo	88 km	19 June – 27 August	25 days later
Gijón	105 km	11 June – 7 September	17 days later
Palencia	108 km	25 May – 3 August	same day
Zamora	122 km	10 May – 9 August	15 days earlier
Valladolid	127 km	15 May – 18 August	10 days earlier

Where to buy watermelon plants and seeds near León (Spain)

Buy plants ready to set out from 25 May to 30 July (from 4 May to 30 July for an unheated greenhouse); seed for raising your own is sown from 6 April to 2 July. Within 15 km of León (Spain) OpenStreetMap lists 1 plant nursery and 1 market (collected 27 October 2026).

Mercado del Conde Luna — market
Mon–Thu 09:00–15:00; Fri, Sat 08:00–15:00 · 0 km
Viveros Galileo — plant nursery
6 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