When to plant watermelons in Manresa: 13 May – 23 August

In Manresa, watermelon: sow for seedlings from 25 March to 26 July; plant into a greenhouse from 22 April to 23 August; plant out into open ground from 13 May to 23 August.

Watermelon in Manresa: soil, season and weather

In Manresa the soil, not frost, sets the date: the last frost is over around 18 March, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 13 May, 56 days later.

Last spring frost	18 March
Top 7 cm of soil at 18 °C	13 May, 56 days after the last frost
Into an unheated greenhouse	22 April – 23 August; April outside: 7.3 °C at night, 18.2 °C by day; card 18–35 °C
First autumn frost	2 December, 203 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	11 July – 21 October
Days left for picking	144
Daylight	13:19 on 15 April, 14:27 on 13 May
Watering outdoors when fruiting (card)	every 5 days; the driest month, December, has 5 rainy days

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

Watermelon in Manresa: care after planting

Planted on 13 May: in the first weeks water every 5 days.

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

13 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 Manresa during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 31.1 °C. Months that stay below 18 °C even by day on average: November (14.9 °C) and December (11.7 °C). Nights average below 18 °C in May, June and September–December (2.9–15.9 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	22.3	10.8	78	11	14:31
June	27.6	15.9	66	8	15:11
July	31.1	18.6	47	7	14:56
August	30.6	18.7	55	8	13:53
September	25	14.6	76	11	12:31
October	20.9	11.3	91	10	11:09
November	14.9	5.6	50	7	9:51
December	11.7	2.9	29	5	9:10

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Manresa, Perpignan is 19 days earlier and Girona 13 days later.

City	Distance	Date	Difference
Barcelona	47 km	24 May – 2 September	11 days later
Tarragona	83 km	from 30 April	13 days earlier
Girona	87 km	26 May – 21 August	13 days later
Lleida	101 km	29 April – 9 September	14 days earlier
Perpignan	139 km	24 April – 2 September	19 days earlier
Tortosa	150 km	from 7 May	6 days earlier

Where to buy watermelon plants and seeds near Manresa

Buy plants ready to set out from 13 May to 23 August (from 22 April to 23 August for an unheated greenhouse); seed for raising your own is sown from 25 March to 26 July. Within 15 km of Manresa OpenStreetMap lists 2 garden centres, 1 plant nursery, 2 markets and 3 farm shops (collected 28 October 2026).

Mercat municipal Puigmercadal — market
Muralla del Carme 5, Manresa · 1 km · blog.puigmercadal.cat
Mercat de la Sagrada Família — market
Carrer de Sant Cristòfol, 08243 Manresa · Mon–Thu 08:00–14:00; Fri 08:00–14:00, 16:30–20:30; Sat 08:00–15:00 · 1 km
Viver Serra — garden centre
3 km · viverserra.es
Jardí net — garden centre
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.

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