Last and first frost dates in Viseu

When is the last frost in Viseu?

The last frost in Viseu usually comes around 7 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 17 January, while corn waits until 30 March. The first autumn frost follows around 10 December, about 306 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 Viseu

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 7 days after the last spring frost and 15 °C 79 days after it.

Frost dates near Viseu

Of the nearest cities on our list, the last spring frost ends earliest in Vila Real (20 January) and latest in Guarda (2 April).

Seeds, seedlings and markets in Viseu

Within 15 km of Viseu OpenStreetMap lists 1 garden centre, 6 farm-supply shops and 4 markets (collected 27 October 2026). The nearest farm supply to the city centre is Agriloja, 2 km away.

• Agriloja — farm supply
  Avenida dos Namorados, 3510-674 Viseu · Mon–Sat 08:30–20:00; Sun 09:00–13:00 · 2 km · agriloja.pt
• Largo da feira semanal — market
  Tue–Mon · 0 km

• Where to buy seeds and seedlings in Viseu
• Selling your own harvest in Portugal

Places: © OpenStreetMap contributors, ODbL.

Weather in Viseu by month

Average weather in Viseu over 2016–2025: the warmest month is August. Months that average 20 °C or more by day: May–October (21.2–30 °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 3.7 °C. About 1158 mm of rain falls in a year, on 114 days; November is the wettest month (156 mm) and July the driest (9 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).