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When to plant hyacinths in Porto: by 19 November

In Porto, hyacinth: plant by 19 November. The winter here is too mild for our late-planting rule, so we give no later limit.

Hyacinth in Porto: soil, season and weather

No month averages below 0 °C at night; the coldest nights, in January, average 6.2 °C.

Plantingby 19 November
First autumn frost19 December
Coldest nightsJanuary, 6.2 °C
Soil back at 1 °C in springalready in the first week of January
Daylight9:46 on 19 November
Daylight at the winter solstice9:12

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

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

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

In Porto 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 Porto, Guarda is 24 days earlier and Braga 4 days later.

CityDistanceDateDifference
Braga47 kmby 23 November4 days later
Viana do Castelo63 kmby 12 November7 days earlier
Vila Real75 kmby 22 November3 days later
Viseu80 kmby 10 November9 days earlier
Guarda132 km26 October – end of December24 days earlier
Ourense146 kmby 3 November16 days earlier

Where to buy hyacinth for planting in Porto

Planting stock goes into the ground by 19 November; buy it before that. Within 15 km of Porto OpenStreetMap lists 13 garden centres, 6 farm-supply shops, 2 plant nurseries, 45 markets and 5 farm shops (collected 7 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Porto?

In Porto, hyacinth: plant by 19 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 Porto?

Last spring frost around 26 January, first autumn frost around 19 December.

Other crops in Porto, with their dates