When to plant cucumbers in Busan: 15 May – 7 September

In Busan, cucumber: sow for seedlings from 27 March to 10 August; plant into a greenhouse from 24 April to 7 September; plant out into open ground from 15 May to 7 September.

Cucumber in Busan: soil, season and weather

In Busan the soil, not frost, sets the date: the last frost is over around 19 March, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 15 May, 57 days later.

Last spring frost	19 March
Top 7 cm of soil at 18 °C	15 May, 57 days after the last frost
Into an unheated greenhouse	24 April – 7 September; April outside: 8.7 °C at night, 19 °C by day; card 18–25 °C
First autumn frost	22 November, 191 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	18 June – 11 October
Days left for picking	157
Daylight	13:08 on 17 April, 14:00 on 15 May
Watering outdoors when fruiting (card)	every 2 days; the driest month, November, has 4 rainy days

The same dates in Busan hold for Bell Pepper, Eggplant, Zucchini, Pumpkin and Watermelon.

Cucumber in Busan: care after planting

Planted on 15 May: in the first weeks water every 4 days.

Feeding, by the card’s schedule from that day:

22 May — feed: nitrogen

Pests and diseases of cucumber to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in Busan during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, August, averages 30.6 °C. Months that stay below 18 °C even by day on average: November (15.4 °C). Nights average below 18 °C in May (13.4 °C), October (12.3 °C) and November (5.1 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	23.4	13.4	127	9	14:00
June	26.8	18.3	197	11	14:31
July	29.6	23	272	17	14:19
August	30.6	23.7	226	17	13:30
September	26.3	19.4	257	14	12:26
October	21.3	12.3	99	8	11:20
November	15.4	5.1	42	4	10:20

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

Around Busan, Fukuoka is 10 days earlier and Jeonju 4 days later.

City	Distance	Date	Difference
Ulsan	47 km	18 May – 1 September	3 days later
Daegu	88 km	16 May – 6 September	1 day later
Jeonju	188 km	19 May – 2 September	4 days later
Daejeon	200 km	17 May – 28 August	2 days later
Gwangju	202 km	17 May – 8 September	2 days later
Fukuoka	215 km	5 May – 6 October	10 days earlier

Where to buy cucumber plants and seeds near Busan

Buy plants ready to set out from 15 May to 7 September (from 24 April to 7 September for an unheated greenhouse); seed for raising your own is sown from 27 March to 10 August. Within 15 km of Busan OpenStreetMap lists 27 markets (collected 28 October 2026).

Haeundae Traditional Market — market
Mon–Sun 09:00–22:00 · 9 km
기장회센터 — market
읍내로104번길 16, 부산광역시 · 15 km
Seomyeon Traditional Market — market
3 km
Dongrae market — market
3 km

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.

Questions