When to plant cucumbers in Castellón de la Plana: from 14 April

In Castellón de la Plana, cucumber: sow for seedlings from 24 February; plant into a greenhouse from 24 March; plant out into open ground from 14 April. There is no autumn frost here, so the frost dates set no end to the window.

Cucumber in Castellón de la Plana: soil, season and weather

In Castellón de la Plana the soil, not frost, sets the date: the last frost is over around 12 January, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 14 April, 92 days later. Castellón de la Plana has no autumn frost in the median year, so frost does not end the season.

Last spring frost	12 January
Top 7 cm of soil at 18 °C	14 April, 92 days after the last frost
Into an unheated greenhouse	from 24 March; March outside: 8.9 °C at night, 17.6 °C by day; card 18–25 °C
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	from 18 May
Daylight	11:59 on 17 March, 13:12 on 14 April
Watering outdoors when fruiting (card)	every 2 days; the driest month, July, has 2 rainy days

The same dates in Castellón de la Plana hold for Bell Pepper, Eggplant, Zucchini, Pumpkin and Watermelon.

Cucumber in Castellón de la Plana: care after planting

Planted on 14 April: in the first weeks water every 4 days.

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

21 April — feed: nitrogen

Pests and diseases of cucumber 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 Castellón de la Plana during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, August, averages 30 °C. Nights average below 18 °C in April (10.8 °C) and May (14.5 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	19.3	10.8	32	6	13:15
May	22.8	14.5	26	5	14:22
June	27	19.2	19	3	15:00
July	29.4	22	15	2	14:45
August	30	22.5	16	3	13:47
September	26.9	19.3	48	6	12:30

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

All the nearest cities on our list plant cucumber later than Castellón de la Plana; the closest date is in Valencia, 8 days later.

City	Distance	Date	Difference
Valencia	64 km	from 22 April	8 days later
Teruel	99 km	12 June – 23 August	59 days later
Tortosa	103 km	from 7 May	23 days later
Gandia	114 km	from 5 May	21 days later
Tarragona	167 km	from 30 April	16 days later
Cuenca (Spain)	177 km	14 May – 29 August	30 days later

Where to buy cucumber plants and seeds near Castellón de la Plana

Buy plants ready to set out from 14 April (from 24 March for an unheated greenhouse); seed for raising your own is sown from 24 February. Within 15 km of Castellón de la Plana OpenStreetMap lists 3 garden centres, 1 farm-supply shop and 8 markets (collected 27 October 2026).

Viveros Sant Roc de Canet — garden centre
4 km
Centro de jardinería Benicasim — garden centre
7 km
La Botiga de la Flor — garden centre
4 km
Agromaestrat — farm supply
6 km

Questions