When to plant watermelons in Gijón: 11 June – 7 September

In Gijón, watermelon: sow for seedlings from 23 April to 10 August; plant into a greenhouse from 21 May to 7 September; plant out into open ground from 11 June to 7 September. For plants and seeds, the places nearby include La Cooperativa (garden centre, 4 km); addresses and opening hours are below.

Watermelon in Gijón: soil, season and weather

In Gijón the soil, not frost, sets the date: the last frost is over around 26 January, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 11 June, 136 days later.

Last spring frost	26 January
Top 7 cm of soil at 18 °C	11 June, 136 days after the last frost
Into an unheated greenhouse	21 May – 7 September; May outside: 10.1 °C at night, 18.2 °C by day; card 18–35 °C
First autumn frost	17 December, 189 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	9 August – 5 November
Days left for picking	130
Daylight	14:39 on 14 May, 15:22 on 11 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, July, has 11 rainy days

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

Watermelon in Gijón: care after planting

Planted on 11 June: in the first weeks water every 5 days.

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

11 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 Gijón during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 23.5 °C. Months that stay below 18 °C even by day on average: November (15.5 °C) and December (13.7 °C). Nights average below 18 °C in every month of the season, from 5.7 °C to 15.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	20.7	13.7	112	14	15:24
July	22.8	15.5	50	11	15:07
August	23.5	15.9	50	10	14:01
September	22	13.5	85	13	12:33
October	19.9	11.3	103	13	11:05
November	15.5	7.9	166	16	9:42
December	13.7	5.7	141	15	8:58

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Gijón, León (Spain) is 17 days earlier and Oviedo 8 days later.

City	Distance	Date	Difference
Oviedo	25 km	19 June – 27 August	8 days later
León (Spain)	105 km	25 May – 30 July	17 days earlier
Ponferrada	134 km	1 June – 18 August	10 days earlier
Lugo	165 km	1 June – 25 August	10 days earlier
Palencia	194 km	25 May – 3 August	17 days earlier
Burgos	208 km	31 May – 8 August	11 days earlier

Where to buy watermelon plants and seeds near Gijón

Buy plants ready to set out from 11 June to 7 September (from 21 May to 7 September for an unheated greenhouse); seed for raising your own is sown from 23 April to 10 August. Within 15 km of Gijón OpenStreetMap lists 4 garden centres, 2 farm-supply shops, 1 plant nursery, 3 markets and 1 farm shop (collected 27 October 2026).

La Cooperativa — garden centre
Mon–Sat 09:00–21:00 · 4 km
Mercado del Sur — market
Mon–Sat 08:00–20:00 · 0 km
Plaza Municipal de Abastos — market
Calle Avilés, 33440 Lluanco/Luanco · 14 km
tujardin — garden centre
4 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.

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