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When to plant hyacinths in Seoul: 7 October – 26 November

In Seoul, hyacinth: plant from 7 October to about 26 November.

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 date is about two weeks before the average daily temperature here falls below 0 °C (ten years of weather): an estimate, not the day the ground freezes, and a cold spell can freeze it earlier. Sources: Iowa State University Extension, Wisconsin Horticulture Extension, UNH Extension, RHS, how the ground freezes (NRC Canada, CBD-26).

Hyacinth in Seoul: soil, season and weather

Nights then average below 0 °C in December–February; the coldest, January, averages -7.1 °C.

Planting7 October – 26 November
First autumn frost6 November
Coldest nightsJanuary, -7.1 °C
Soil back at 1 °C in spring24 January
Daylight11:35 on 7 October
Daylight at the winter solstice9:34

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

Hyacinth in Seoul: 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 Seoul the average daily temperature stays at 10 °C or lower for about 22 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 Seoul, Chuncheon is 6 days earlier and Gwangju 17 days later.

CityDistanceDateDifference
Chuncheon74 km1 October – 22 November6 days earlier
Daejeon139 km13 October – 5 December6 days later
Gangneung169 km22 October – end of December15 days later
Jeonju194 km18 October – 17 December11 days later
Daegu236 km22 October – end of December15 days later
Gwangju266 km24 October – end of December17 days later

Where to buy hyacinth for planting in Seoul

Planting stock goes into the ground from 7 October to about 26 November; buy it before that. Within 15 km of Seoul OpenStreetMap lists 1 garden centre, 2 plant nurseries and 85 markets (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Seoul?

In Seoul, hyacinth: plant from 7 October to about 26 November. 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 Seoul?

Last spring frost around 29 March, first autumn frost around 6 November.

Other crops in Seoul, with their dates