When to plant cucumbers in Gwangju: 17 May – 8 September

In Gwangju, cucumber: sow for seedlings from 29 March to 11 August; plant into a greenhouse from 26 April to 8 September; plant out into open ground from 17 May to 8 September.

Cucumber in Gwangju: soil, season and weather

In Gwangju the soil, not frost, sets the date: the last frost is over around 1 April, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 17 May, 46 days later.

Last spring frost	1 April
Top 7 cm of soil at 18 °C	17 May, 46 days after the last frost
Into an unheated greenhouse	26 April – 8 September; April outside: 7.4 °C at night, 18.8 °C by day; card 18–25 °C
First autumn frost	23 November, 190 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	20 June – 12 October
Days left for picking	156
Daylight	13:12 on 19 April, 14:03 on 17 May
Watering outdoors when fruiting (card)	every 2 days; the driest month, November, has 5 rainy days

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

Cucumber in Gwangju: care after planting

Planted on 17 May: in the first weeks water every 4 days.

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

24 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 Gwangju during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, August, averages 30.4 °C. Months that stay below 18 °C even by day on average: November (13.9 °C). Nights average below 18 °C in May, June and October, November (4.4–17.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	23.3	12.2	118	9	14:00
June	27.2	17.8	176	12	14:31
July	29.4	22.5	287	18	14:19
August	30.4	23	217	16	13:30
September	26.3	18.5	178	12	12:26
October	20.1	11.3	94	7	11:20
November	13.9	4.4	50	5	10:20

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

Around Gwangju, Jeju City is 11 days earlier and Jeonju 2 days later.

City	Distance	Date	Difference
Jeonju	77 km	19 May – 2 September	2 days later
Daejeon	140 km	17 May – 28 August	same day
Daegu	176 km	16 May – 6 September	1 day earlier
Jeju City	187 km	6 May – 4 October	11 days earlier
Busan	202 km	15 May – 7 September	2 days earlier
Ulsan	228 km	18 May – 1 September	1 day later

Where to buy cucumber plants and seeds near Gwangju

Buy plants ready to set out from 17 May to 8 September (from 26 April to 8 September for an unheated greenhouse); seed for raising your own is sown from 29 March to 11 August. Within 15 km of Gwangju OpenStreetMap lists 1 garden centre, 14 markets and 1 farm shop (collected 28 October 2026).

봉선시장 — market
봉선중앙로91번길, 광주광역시 · 7 km
Seoksan Florist — garden centre
3 km
1913 Songjeong Market — market
7 km
Namgwangu Market — market
7 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