When to plant watermelons in Huesca: 23 May – 17 August

In Huesca, watermelon: sow for seedlings from 4 April to 20 July; plant into a greenhouse from 2 May to 17 August; plant out into open ground from 23 May to 17 August.

Watermelon in Huesca: soil, season and weather

In Huesca the soil, not frost, sets the date: the last frost is over around 22 March, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 23 May, 62 days later.

Last spring frost	22 March
Top 7 cm of soil at 18 °C	23 May, 62 days after the last frost
Into an unheated greenhouse	2 May – 17 August; May outside: 10 °C at night, 21.3 °C by day; card 18–35 °C
First autumn frost	26 November, 187 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	21 July – 15 October
Days left for picking	128
Daylight	13:47 on 25 April, 14:49 on 23 May
Watering outdoors when fruiting (card)	every 5 days; the driest month, July, has 5 rainy days

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

Watermelon in Huesca: care after planting

Planted on 23 May: in the first weeks water every 5 days.

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

23 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 Huesca during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 30.4 °C. Months that stay below 18 °C even by day on average: November (12.8 °C). Nights average below 18 °C in every month of the season, from 5.3 °C to 17.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	21.3	10	62	9	14:33
June	26.9	15.3	48	8	15:14
July	30.4	17.4	24	5	14:58
August	30.3	17.9	32	4	13:55
September	24.2	13.7	59	6	12:32
October	19.4	10.5	84	9	11:08
November	12.8	5.3	71	9	9:49

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Huesca, Lleida is 24 days earlier and Jaca 27 days later.

City	Distance	Date	Difference
Jaca	47 km	19 June – 22 July	27 days later
Zaragoza	67 km	30 April – 10 September	23 days earlier
Tudela	99 km	6 May – 28 August	17 days earlier
Lleida	103 km	29 April – 9 September	24 days earlier
Pamplona	125 km	1 June – 21 August	9 days later
Pau	130 km	2 June – 25 August	10 days later

Where to buy watermelon plants and seeds near Huesca

Buy plants ready to set out from 23 May to 17 August (from 2 May to 17 August for an unheated greenhouse); seed for raising your own is sown from 4 April to 20 July. Within 15 km of Huesca OpenStreetMap lists 2 garden centres, 1 farm-supply shop and 2 plant nurseries (collected 27 October 2026).

Alberos Agroservicios — farm supply
1 km
Brotalia — garden centre
4 km · brotalia.com
Oscanna — garden centre
1 km
Viveros Oliván — plant nursery
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