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When to plant cucumbers in Japan: 28 April – 11 October

Cucumber in Japan: plant out into open ground from 28 April to 11 October; the window opens earliest in Tokyo and closes latest in Kagoshima (13 cities).

Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

Planting window by climate zone

ZoneCitiesWindow
270 frost-free days or moreTokyo, Osaka, Fukuoka, Niigata, Hamamatsu, Okayama, Kagoshima28 April – 11 October
210–269 frost-free daysNagoya, Kyoto, Hiroshima, Sendai, Kumamoto2 May – 25 September
150–209 frost-free daysSapporo17 July – 2 August
Frost without a regular seasonKitakyushufrom 15 May

Cucumber: the window in each city

CityWindowZone
Tokyo28 April – 29 September270 frost-free days or more
Hamamatsu2 May – 3 October270 frost-free days or more
Kumamoto2 May – 18 September210–269 frost-free days
Fukuoka5 May – 6 October270 frost-free days or more
Osaka5 May – 2 October270 frost-free days or more
Kagoshima6 May – 11 October270 frost-free days or more
Nagoya6 May – 25 September210–269 frost-free days
Kyoto14 May – 22 September210–269 frost-free days
Okayama14 May – 30 September270 frost-free days or more
Kitakyushufrom 15 MayFrost without a regular season
Niigata20 May – 5 October270 frost-free days or more
Hiroshima26 May – 10 September210–269 frost-free days
Sendai7 June – 8 September210–269 frost-free days
Sapporo17 July – 2 August150–209 frost-free days