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When to plant hyacinths in Okayama: 15 November – end of December

In Okayama, hyacinth: plant from 15 November to the end of December. For planting stock, the places nearby include JA岡山はなやか南店 (farm shop, 5 km) and 早島町ふれあい青空市 (farm shop, 10 km); addresses and opening hours are below.

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 Okayama: soil, season and weather

No month averages below 0 °C at night; the coldest nights, in January, average 0.3 °C.

Planting15 November – end of December
First autumn frost15 December
Coldest nightsJanuary, 0.3 °C
Soil back at 1 °C in springalready in the first week of January
Daylight10:22 on 15 November
Daylight at the winter solstice9:50

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

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

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

In Okayama the average daily temperature stays at 10 °C or lower for about 16 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 Okayama, Hiroshima is 20 days earlier and Fukuoka 6 days later.

CityDistanceDateDifference
Hiroshima138 km26 October – end of December20 days earlier
Osaka145 km17 November – end of December2 days later
Kyoto174 km7 November – end of December8 days earlier
Nagoya278 km10 November – end of December5 days earlier
Fukuoka345 kmby 21 November6 days later
Hamamatsu348 kmby 18 November3 days later

Where to buy hyacinth for planting in Okayama

Planting stock goes into the ground from 15 November to the end of December; buy it before that. Within 15 km of Okayama OpenStreetMap lists 8 garden centres, 5 farm-supply shops, 3 markets and 19 farm shops (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Okayama?

In Okayama, hyacinth: plant from 15 November 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 Okayama?

Last spring frost around 20 March, first autumn frost around 15 December.

Other crops in Okayama, with their dates