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When to plant hyacinths in Jeonju: 18 October – 17 December

In Jeonju, hyacinth: plant from 18 October to about 17 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 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 Jeonju: soil, season and weather

Nights then average below 0 °C in December–February; the coldest, January, averages -4.6 °C.

Planting18 October – 17 December
First autumn frost17 November
Coldest nightsJanuary, -4.6 °C
Soil back at 1 °C in spring18 January
Daylight11:13 on 18 October
Daylight at the winter solstice9:44

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

Hyacinth in Jeonju: 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 Jeonju the average daily temperature stays at 10 °C or lower for about 21 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 Jeonju, Seoul is 11 days earlier and Gwangju 6 days later.

CityDistanceDateDifference
Daejeon63 km13 October – 5 December5 days earlier
Gwangju77 km24 October – end of December6 days later
Daegu131 km22 October – end of December4 days later
Busan188 km23 October – end of December5 days later
Seoul194 km7 October – 26 November11 days earlier
Ulsan198 km17 October – end of December1 day earlier

Where to buy hyacinth for planting in Jeonju

Planting stock goes into the ground from 18 October to about 17 December; buy it before that. Within 15 km of Jeonju OpenStreetMap lists 7 markets (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Jeonju?

In Jeonju, hyacinth: plant from 18 October to about 17 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 Jeonju?

Last spring frost around 27 March, first autumn frost around 17 November.

Other crops in Jeonju, with their dates