Last and first frost dates in Viana do Castelo

When is the last frost in Viana do Castelo?

The last frost in Viana do Castelo usually comes around 3 February: 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 13 January, while corn waits until 26 March. The first autumn frost follows around 12 December, about 312 days later: harvest or cover frost-tender crops before then.

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 Viana do Castelo

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 8 days after the last spring frost and 15 °C 88 days after it.

Frost dates near Viana do Castelo

Of the nearest cities on our list, the last spring frost ends earliest in Vigo (14 January) and latest in Guimarães (13 February).

Seeds, seedlings and markets in Viana do Castelo

Within 15 km of Viana do Castelo OpenStreetMap lists 1 farm-supply shop, 1 plant nursery and 3 markets (collected 27 October 2026). The nearest market to the city centre is Mercado Municipal de Vila Praia de Âncora, 14 km away.

• Mercado Municipal de Vila Praia de Âncora — market
  Mon, Tue, Wed, Fri, Sat 08:00–18:00; Thu 07:00–18:00 · 14 km

• Where to buy seeds and seedlings in Viana do Castelo
• Selling your own harvest in Portugal

Places: © OpenStreetMap contributors, ODbL.

Weather in Viana do Castelo by month

Average weather in Viana do Castelo over 2016–2025: the warmest month is August. Months that average 20 °C or more by day: June–September (21.1–24.8 °C). No month averages below 0 °C at night; the coldest nights, in January, average 4.3 °C. About 1961 mm of rain falls in a year, on 138 days; December is the wettest month (272 mm) and July the driest (22 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).

Planted in autumn

From a month before the first autumn frost, so the roots grow before winter, to the late-planting limit on each crop’s page (about two weeks before the ground freezes, by ten years of weather).