When to plant watermelons in Vigo: from 9 May

In Vigo, watermelon: sow for seedlings from 21 March; plant into a greenhouse from 18 April; plant out into open ground from 9 May. There is no autumn frost here, so the frost dates set no end to the window.

Watermelon in Vigo: soil, season and weather

In Vigo the soil, not frost, sets the date: the last frost is over around 14 January, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 9 May, 115 days later. Vigo has no autumn frost in the median year, so frost does not end the season.

Last spring frost	14 January
Top 7 cm of soil at 18 °C	9 May, 115 days after the last frost
Into an unheated greenhouse	from 18 April; April outside: 10 °C at night, 18.4 °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 7 July
Daylight	13:09 on 11 April, 14:21 on 9 May
Watering outdoors when fruiting (card)	every 5 days; the driest month, July, has 5 rainy days

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

Watermelon in Vigo: care after planting

Planted on 9 May: in the first weeks water every 5 days.

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

9 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 Vigo 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. Nights average below 18 °C in every month of the season, from 12.5 °C to 17.3 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	21	12.5	113	11	14:34
June	23	15.2	81	11	15:15
July	26.5	17.1	24	5	14:59
August	26.8	17.3	32	5	13:55
September	24	15.6	87	9	12:32
October	21.2	13.6	240	14	11:08

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

All the nearest cities on our list plant watermelon later than Vigo; the closest date is in Porto, 13 days later.

City	Distance	Date	Difference
Pontevedra	23 km	from 26 May	17 days later
Viana do Castelo	61 km	30 May – 2 September	21 days later
Ourense	72 km	1 June – 24 August	23 days later
Santiago de Compostela	74 km	5 June – 7 September	27 days later
Braga	80 km	24 May – 13 September	15 days later
Porto	120 km	22 May – 9 September	13 days later

Where to buy watermelon plants and seeds near Vigo

Buy plants ready to set out from 9 May (from 18 April for an unheated greenhouse); seed for raising your own is sown from 21 March. Within 15 km of Vigo OpenStreetMap lists 3 garden centres, 9 farm-supply shops, 5 plant nurseries, 22 markets and 4 farm shops (collected 27 October 2026).

Shitake — plant nursery
15 km
Almacéns Celso — farm supply · sells seed
7 km
Novo Agro — farm supply
13 km
VerdeMiñor — farm supply
13 km

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