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When to plant hyacinths in Hamamatsu: by 18 November

In Hamamatsu, hyacinth: plant by 18 November. The winter here is too mild for our late-planting rule, so we give no later limit.

Hyacinth in Hamamatsu: soil, season and weather

No month averages below 0 °C at night; the coldest nights, in January, average 1.7 °C.

Plantingby 18 November
First autumn frost18 December
Coldest nightsJanuary, 1.7 °C
Soil back at 1 °C in springalready in the first week of January
Daylight10:17 on 18 November
Daylight at the winter solstice9:50

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

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

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

In Hamamatsu 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

Around Hamamatsu, Kyoto is 11 days earlier and Niigata 2 days later.

CityDistanceDateDifference
Nagoya92 km10 November – end of December8 days earlier
Kyoto182 km7 November – end of December11 days earlier
Osaka204 km17 November – end of December1 day earlier
Tokyo209 km14 November – end of December4 days earlier
Okayama348 km15 November – end of December3 days earlier
Niigata376 km20 November – end of December2 days later

Where to buy hyacinth for planting in Hamamatsu

Planting stock goes into the ground by 18 November; buy it before that. Within 15 km of Hamamatsu OpenStreetMap lists 5 garden centres, 6 farm-supply shops, 5 markets and 39 farm shops (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Hamamatsu?

In Hamamatsu, hyacinth: plant by 18 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 Hamamatsu?

Last spring frost around 24 February, first autumn frost around 18 December.

Other crops in Hamamatsu, with their dates