GreenlyWhen to plant zucchini in Castellón de la Plana: from 14 April
In Castellón de la Plana, zucchini: sow for seedlings from 3 March; 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.
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Zucchini 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 zucchini 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 |
| Days in the bed to the first harvest (card) | 36 |
| First harvest, if planted in this window | from 20 May |
| Daylight | 12:18 on 24 March, 13:12 on 14 April |
| Watering outdoors when fruiting (card) | every 3 days; the driest month, July, has 2 rainy days |
The same dates in Castellón de la Plana hold for Cucumber, Bell Pepper, Eggplant, Pumpkin and Watermelon.
Zucchini in Castellón de la Plana: care after planting
Planted on 14 April: in the first weeks water every 4 days.
Pests and diseases of zucchini to watch for:
Weather in Castellón de la Plana during the zucchini season
About 156 mm of rain falls in the season; July is the driest month (15 mm) and September the wettest (48 mm).
| 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
Zucchini in nearby cities
All the nearest cities on our list plant zucchini later than Castellón de la Plana; the closest date is in Valencia, 8 days later.
Where to buy zucchini 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 3 March. 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
Places: © OpenStreetMap contributors, ODbL.
- How to grow zucchini
- All frost dates and weather of Castellón de la Plana
- Shops and markets: Castellón de la Plana
- Selling a surplus in Spain
- Moon planting calendar for November 2026
- How we calculate the dates
Questions
When to plant zucchini in Castellón de la Plana?
In Castellón de la Plana, zucchini: sow for seedlings from 3 March; 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.
When to sow zucchini for seedlings in Castellón de la Plana?
Sow for seedlings from 3 March.
