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When to plant crocuses in Kumamoto: by 3 November

In Kumamoto, crocus: plant by 3 November. The winter here is too mild for our late-planting rule, so we give no later limit. For planting stock, the places nearby include 合志物産館 志来菜彩 (farm shop, 11 km) and ガーデン館 (garden centre, 12 km); addresses and opening hours are below.

Crocus in Kumamoto: soil, season and weather

No month averages below 0 °C at night; the coldest nights, in January, average 1.4 °C.

Plantingby 3 November
First autumn frost3 December
Coldest nightsJanuary, 1.4 °C
Soil back at 1 °C in springalready in the first week of January
Daylight10:49 on 3 November
Daylight at the winter solstice9:59

The same dates in Kumamoto hold for Garlic, Tulip, Daffodil and Hyacinth.

Crocus in Kumamoto: depth, winter cold, pests and pets

Plant Dutch crocuses (Crocus vernus) about 12 cm deep and 9 cm apart; smaller species go 7–10 cm deep (RHS).

In Kumamoto the average daily temperature stays at 10 °C or lower for about 13 weeks a year (our estimate from ten years of monthly weather). For this bulb Wisconsin Horticulture Extension gives a cold period of 15–17 weeks at about 2–10 °C. That is less than the bulbs need, and without more cold they may not flower properly. The cold can also be given in a refrigerator at about 2–7 °C, as Wisconsin Horticulture Extension does for crocuses forced in pots.

Crocuses multiply on their own (they naturalise); in a lawn, hold off mowing until their leaves die back (RHS).

Birds, squirrels and rodents damage crocuses; planting under metal mesh may reduce losses (RHS). Spring crocus gives dogs and cats vomiting and diarrhoea; do not confuse it with autumn crocus (Colchicum), which is very toxic (Pet Poison Helpline).

Sources: RHS, Wisconsin Horticulture Extension, Pet Poison Helpline.

Crocus in nearby cities

Around Kumamoto, Ulsan is 17 days earlier and Kagoshima 23 days later.

CityDistanceDateDifference
Fukuoka92 kmby 21 November18 days later
Kagoshima134 kmby 26 November23 days later
Hiroshima239 km26 October – end of December8 days earlier
Busan305 km23 October – end of December11 days earlier
Ulsan331 km17 October – end of December17 days earlier
Okayama361 km15 November – end of December12 days later

Where to buy crocus for planting in Kumamoto

Planting stock goes into the ground by 3 November; buy it before that. Within 15 km of Kumamoto OpenStreetMap lists 3 garden centres, 5 markets and 2 farm shops (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant crocuses in Kumamoto?

In Kumamoto, crocus: plant by 3 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 Kumamoto?

Last spring frost around 18 March, first autumn frost around 3 December.

Other crops in Kumamoto, with their dates