GreenlyWhen to plant tomatoes in Castellón de la Plana: from 9 March
In Castellón de la Plana, tomato: sow for seedlings from 26 December; plant into a greenhouse from 16 February; plant out into open ground from 9 March. There is no autumn frost here, so the frost dates set no end to the window.
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Tomato 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 15 °C — the minimum on the tomato card — only around 9 March, 56 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 15 °C | 9 March, 56 days after the last frost |
| Into an unheated greenhouse | from 16 February; February outside: 6.8 °C at night, 16.3 °C by day; card 16–27 °C |
| Days in the bed to the first harvest (card) | 70 |
| First harvest, if planted in this window | from 18 May |
| Daylight | 9:40 on 16 January, 11:38 on 9 March |
| Watering outdoors when fruiting (card) | every 3 days; the driest month, July, has 2 rainy days |
Tomato in Castellón de la Plana: care after planting
Planted on 9 March: in the first weeks water every 4 days.
Feeding, by the card’s schedule from that day:
- 9 March — feed: balanced (NPK)
- 6 April — feed: nitrogen
Pests and diseases of tomato to watch for:
- Bacterial canker of tomato
- Tomato leaf mould
- Late Blight
- Bacterial spot
- Fruit cracking
- Bacterial wilt (brown rot of potato)
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 tomato season
Days average above the tomato card's 16–27 °C in July (29.4 °C) and August (30 °C). Nights average below 16 °C in March (8.9 °C), April (10.8 °C) and May (14.5 °C).
| Month | Day, °C | Night, °C | Rain, mm | Rainy days | Daylight on the 15th |
|---|---|---|---|---|---|
| March | 17.6 | 8.9 | 57 | 8 | 11:54 |
| 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 |
ERA5 2016–2025, Open-Meteo
Tomato in nearby cities
Around Castellón de la Plana, Valencia is 2 days earlier and Teruel 74 days later.
Where to buy tomato plants and seeds near Castellón de la Plana
Buy plants ready to set out from 9 March (from 16 February for an unheated greenhouse); seed for raising your own is sown from 26 December. 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 tomato
- All frost dates and weather of Castellón de la Plana
- Shops and markets: Castellón de la Plana
- Selling a surplus in Spain
- When to plant tomatoes in Spain
- Moon planting calendar for November 2026
- How we calculate the dates
Questions
When to plant tomatoes in Castellón de la Plana?
In Castellón de la Plana, tomato: sow for seedlings from 26 December; plant into a greenhouse from 16 February; plant out into open ground from 9 March. There is no autumn frost here, so the frost dates set no end to the window.
When to sow tomatoes for seedlings in Castellón de la Plana?
Sow for seedlings from 26 December.
