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When to plant hyacinths in Castelo Branco: by 26 November

In Castelo Branco, hyacinth: plant by 26 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, 4 km); addresses and opening hours are below.

Hyacinth in Castelo Branco: soil, season and weather

No month averages below 0 °C at night; the coldest nights, in January, average 5 °C.

Plantingby 26 November
First autumn frost26 December
Coldest nightsJanuary, 5 °C
Soil back at 1 °C in springalready in the first week of January
Daylight9:41 on 26 November
Daylight at the winter solstice9:21

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

Hyacinth in Castelo Branco: depth, winter cold, pests and pets

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

In Castelo Branco the average daily temperature stays at 10 °C or lower for about 3 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. That is less than the bulbs need, and without more cold they may not flower properly. Where winters are not cold enough for long enough, LSU AgCenter keeps tulip and hyacinth bulbs in the refrigerator for at least six to eight weeks before planting, and plants them only once the soil has cooled: warm soil can cancel the chilling. Keep fruit out of that refrigerator — ripening fruit gives off ethylene, which harms the flowers (Wisconsin Horticulture Extension).

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, LSU AgCenter, ASPCA.

Hyacinth in nearby cities

Around Castelo Branco, Guarda is 31 days earlier and Plasencia 4 days later.

CityDistanceDateDifference
Guarda82 km26 October – end of December31 days earlier
Viseu100 kmby 10 November16 days earlier
Cáceres103 kmby 24 November2 days earlier
Badajoz114 kmby 16 November10 days earlier
Plasencia122 kmby 30 November4 days later
Mérida (Spain)141 kmby 19 November7 days earlier

Where to buy hyacinth for planting in Castelo Branco

Planting stock goes into the ground by 26 November; buy it before that. Within 15 km of Castelo Branco OpenStreetMap lists 1 garden centre, 2 farm-supply shops and 2 markets (collected 27 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Castelo Branco?

In Castelo Branco, hyacinth: plant by 26 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 Castelo Branco?

Last spring frost around 17 January, first autumn frost around 26 December.

Other crops in Castelo Branco, with their dates