GreenlyWhen to plant eggplants in Castellón de la Plana: from 14 April
In Castellón de la Plana, eggplant: sow for seedlings from 23 January; 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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Eggplant 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 eggplant 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 21–29 °C |
| Days in the bed to the first harvest (card) | 70 |
| First harvest, if planted in this window | from 23 June |
| Daylight | 10:36 on 13 February, 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, Zucchini, Pumpkin and Watermelon.
Eggplant 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:
- 14 April — feed: balanced (NPK)
- 12 May — feed: nitrogen
Pests and diseases of eggplant to watch for:
- Bacterial wilt (brown rot of potato)
- Colorado Potato Beetle
- Early Blight
- Tomato hornworm
- Tomato russet mite
- Blossom-end rot
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 eggplant season
Days average above the eggplant card's 21–29 °C in July (29.4 °C) and August (30 °C). Months that stay below 21 °C even by day on average: April (19.3 °C). Nights average below 21 °C in April–June and September (10.8–19.3 °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
Eggplant in nearby cities
All the nearest cities on our list plant eggplant later than Castellón de la Plana; the closest date is in Valencia, 8 days later.
Where to buy eggplant 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 23 January. Within 15 km of Castellón de la Plana OpenStreetMap lists 3 garden centres, 1 farm-supply shop and 8 markets (collected 27 October 2026).
- Mercat Municipal — market
Carrer de La Tanda 52, 12530 Borriana / Burriana · Sat, Mon–Fri 09:00–13:00; Fri 17:00–20:30 · 12 km - la Llotja — market
Moll de la Costa* 1, 12530 Borriana / Burriana · 14 km - Mercat Central — market
Plaça Major, 12001 Castelló de la Plana · 1 km - Mercat de Les Alqueries — market
Vía Augusta, 12539 les Alqueries / Alquerías del Niño Perdido · 12 km
Places: © OpenStreetMap contributors, ODbL.
- How to grow eggplant
- 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 eggplants in Castellón de la Plana?
In Castellón de la Plana, eggplant: sow for seedlings from 23 January; 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 eggplants for seedlings in Castellón de la Plana?
Sow for seedlings from 23 January.
