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When to plant hyacinths in Copenhagen: 20 October – end of December

In Copenhagen, hyacinth: plant from 20 October to the end of December.

Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

The average daily temperature here stays above 0 °C all winter, and at least three months average 7 °C or less: our rule of thumb for the winter cold spring bulbs need. Sources: Iowa State University Extension, Wisconsin Horticulture Extension, UNH Extension, RHS.

Hyacinth in Copenhagen: soil, season and weather

Nights then average below 0 °C in January; the coldest, January, averages -0.2 °C.

Planting20 October – end of December
First autumn frost19 November
Coldest nightsJanuary, -0.2 °C
Soil back at 1 °C in springalready in the first week of January
Daylight10:10 on 20 October
Daylight at the winter solstice7:01

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

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

Plant hyacinths 10 cm deep, at least 7.5 cm apart (RHS). In the ground hyacinths are fully hardy, but in containers they can be frost tender in cold winters (RHS); here winter nights average below 0 °C, so wrap the pots or move them to a sheltered spot.

In Copenhagen the average daily temperature stays at 10 °C or lower for about 28 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 Copenhagen, Rostock is 2 days earlier and Potsdam 2 days later.

CityDistanceDateDifference
Rostock179 km18 October – end of December2 days earlier
Kiel217 km21 October – end of December1 day later
Szczecin281 km18 October – end of December2 days earlier
Hamburg289 km20 October – end of Decembersame day
Berlin356 km20 October – end of Decembersame day
Potsdam366 km22 October – end of December2 days later

Where to buy hyacinth for planting in Copenhagen

Planting stock goes into the ground from 20 October to the end of December; buy it before that. Within 15 km of Copenhagen OpenStreetMap lists 9 garden centres, 2 farm-supply shops, 3 plant nurseries, 7 markets and 7 farm shops (collected 7 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Copenhagen?

In Copenhagen, hyacinth: plant from 20 October to the end of December. Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

When is the last spring frost in Copenhagen?

Last spring frost around 19 April, first autumn frost around 19 November.

Other crops in Copenhagen, with their dates