When to plant cucumbers in South Korea: 6 May – 4 October

Cucumber in South Korea: plant out into open ground from 6 May to 4 October.

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

Zone	Cities	Window
270 frost-free days or more	Jeju City	6 May – 4 October
210–269 frost-free days	Seoul, Busan, Daegu, Daejeon, Gwangju, Ulsan, Jeonju, Gangneung	15 May – 8 September
150–209 frost-free days	Chuncheon	24 May – 16 August

Cucumber: the window in each city

City	Window	Zone
Jeju City	6 May – 4 October	270 frost-free days or more
Busan	15 May – 7 September	210–269 frost-free days
Seoul	15 May – 22 August	210–269 frost-free days
Daegu	16 May – 6 September	210–269 frost-free days
Daejeon	17 May – 28 August	210–269 frost-free days
Gangneung	17 May – 6 September	210–269 frost-free days
Gwangju	17 May – 8 September	210–269 frost-free days
Ulsan	18 May – 1 September	210–269 frost-free days
Jeonju	19 May – 2 September	210–269 frost-free days
Chuncheon	24 May – 16 August	150–209 frost-free days