Last and first frost dates in Castellón de la Plana

When is the last frost in Castellón de la Plana?

The last frost in Castellón de la Plana usually comes around 12 January: that is the median of 2016–2025, so in about half of those years the last night at or below 0 °C came later. Hardy crops start before it and frost-tender ones only after it: in the table below arugula can go into open ground from 22 December, while corn waits until 30 January.

When to sow and plant

Planting out: a week after the last frost once the soil is warm enough for the crop; frost-hardy crops three weeks before it; an unheated greenhouse three weeks earlier. Seedlings are sown so they are ready on that day. 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.

When the soil warms up in Castellón de la Plana

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo). The soil reaches 10 °C 3 days before the last spring frost and 15 °C 56 days after it.

Frost dates near Castellón de la Plana

Of the nearest cities on our list, the last spring frost ends earliest in Tarragona (12 January) and latest in Teruel (22 April).

Seeds, seedlings and markets in Castellón de la Plana

Within 15 km of Castellón de la Plana OpenStreetMap lists 3 garden centres, 1 farm-supply shop and 8 markets (collected 27 October 2026). The nearest market to the city centre is Mercat Central, 1 km away.

• Mercat Central — market
  Plaça Major, 12001 Castelló de la Plana · 1 km
• 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
• Mercat de Les Alqueries — market
  Vía Augusta, 12539 les Alqueries / Alquerías del Niño Perdido · 12 km
• la Llotja — market
  Moll de la Costa* 1, 12530 Borriana / Burriana · 14 km

• Where to buy seeds and seedlings in Castellón de la Plana
• Selling your own harvest in Spain

Places: © OpenStreetMap contributors, ODbL.

Weather in Castellón de la Plana by month

Average weather in Castellón de la Plana over 2016–2025: the warmest month is August. Months that average 20 °C or more by day: May–October (22.8–30 °C). Months that average 30 °C or more by day: August (30 °C). No month averages below 0 °C at night; the coldest nights, in January, average 5.9 °C. About 426 mm of rain falls in a year, on 57 days; October is the wettest month (67 mm) and July the driest (15 mm).

Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).