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When to plant hyacinths in Viseu: by 10 November

In Viseu, hyacinth: plant by 10 November. The winter here is too mild for our late-planting rule, so we give no later limit. For planting stock, the places nearby include Agriloja (farm supply, 2 km); addresses and opening hours are below.

Hyacinth in Viseu: soil, season and weather

No month averages below 0 °C at night; the coldest nights, in January, average 3.7 °C.

Plantingby 10 November
First autumn frost10 December
Coldest nightsJanuary, 3.7 °C
Soil back at 1 °C in springalready in the first week of January
Daylight10:07 on 10 November
Daylight at the winter solstice9:15

The same dates in Viseu hold for Garlic, Tulip, Daffodil and Crocus.

Hyacinth in Viseu: depth, winter cold, pests and pets

Plant hyacinths 10 cm deep, at least 7.5 cm apart (RHS).

In Viseu the average daily temperature stays at 10 °C or lower for about 14 weeks a year (our estimate from ten years of monthly weather). For this bulb Wisconsin Horticulture Extension gives a cold period of 12–15 weeks at about 2–10 °C. The winter here gives that in the ground, so the bulbs need no pre-chilling.

Flowers get smaller in the years after planting: for full spikes, replace the bulbs or add a few new ones each autumn (RHS).

If squirrels are a problem, protect the bulbs with wire mesh (RHS). Hyacinths are toxic to dogs, cats and horses: intense vomiting and diarrhoea (ASPCA).

Sources: RHS, Wisconsin Horticulture Extension, ASPCA.

Hyacinth in nearby cities

Around Viseu, Guarda is 15 days earlier and Castelo Branco 16 days later.

CityDistanceDateDifference
Guarda56 km26 October – end of December15 days earlier
Vila Real73 kmby 22 November12 days later
Porto80 kmby 19 November9 days later
Castelo Branco100 kmby 26 November16 days later
Braga108 kmby 23 November13 days later
Viana do Castelo138 kmby 12 November2 days later

Where to buy hyacinth for planting in Viseu

Planting stock goes into the ground by 10 November; buy it before that. Within 15 km of Viseu OpenStreetMap lists 1 garden centre, 6 farm-supply shops and 4 markets (collected 27 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Viseu?

In Viseu, hyacinth: plant by 10 November. The winter here is too mild for our late-planting rule, so we give no later limit.

When is the last spring frost in Viseu?

Last spring frost around 7 February, first autumn frost around 10 December.

Other crops in Viseu, with their dates