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When to plant hyacinths in Jeju City: by 19 November

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

Hyacinth in Jeju City: soil, season and weather

No month averages below 0 °C at night; the coldest nights, in January, average 3.2 °C.

Plantingby 19 November
First autumn frost19 December
Coldest nightsJanuary, 3.2 °C
Soil back at 1 °C in springalready in the first week of January
Daylight10:21 on 19 November
Daylight at the winter solstice9:56

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

Hyacinth in Jeju City: depth, winter cold, pests and pets

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

In Jeju City 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

All the nearest cities on our list plant hyacinth earlier than Jeju City; the closest date is in Gwangju, 26 days earlier.

CityDistanceDateDifference
Gwangju187 km24 October – end of December26 days earlier
Jeonju263 km18 October – 17 December32 days earlier
Busan299 km23 October – end of December27 days earlier
Daegu324 km22 October – end of December28 days earlier
Daejeon326 km13 October – 5 December37 days earlier
Ulsan342 km17 October – end of December33 days earlier

Where to buy hyacinth for planting in Jeju City

Planting stock goes into the ground by 19 November; buy it before that. Within 15 km of Jeju City OpenStreetMap lists 1 garden centre, 7 markets and 1 farm shop (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Jeju City?

In Jeju City, 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 Jeju City?

Last spring frost around 18 February, first autumn frost around 19 December.

Other crops in Jeju City, with their dates