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When to plant hyacinths in Daejeon: 13 October – 5 December

In Daejeon, hyacinth: plant from 13 October to about 5 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 Daejeon: soil, season and weather

Nights then average below 0 °C in December–February; the coldest, January, averages -5.1 °C.

Planting13 October – 5 December
First autumn frost12 November
Coldest nightsJanuary, -5.1 °C
Soil back at 1 °C in spring23 January
Daylight11:23 on 13 October
Daylight at the winter solstice9:41

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

Hyacinth in Daejeon: 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 Daejeon 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 Daejeon, Chuncheon is 12 days earlier and Gwangju 11 days later.

CityDistanceDateDifference
Jeonju63 km18 October – 17 December5 days later
Daegu121 km22 October – end of December9 days later
Seoul139 km7 October – 26 November6 days earlier
Gwangju140 km24 October – end of December11 days later
Chuncheon172 km1 October – 22 November12 days earlier
Ulsan195 km17 October – end of December4 days later

Where to buy hyacinth for planting in Daejeon

Planting stock goes into the ground from 13 October to about 5 December; buy it before that. Within 15 km of Daejeon OpenStreetMap lists 24 markets and 1 farm shop (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Daejeon?

In Daejeon, hyacinth: plant from 13 October to about 5 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 Daejeon?

Last spring frost around 1 April, first autumn frost around 12 November.

Other crops in Daejeon, with their dates