When to plant zucchini in Seoul: 15 May – 20 August

In Seoul, zucchini: sow for seedlings from 3 April to 30 July; plant into a greenhouse from 24 April to 20 August; plant out into open ground from 15 May to 20 August. For plants and seeds, the places nearby include 방실농원 (garden centre, 13 km); addresses and opening hours are below.

Zucchini in Seoul: soil, season and weather

In Seoul the soil, not frost, sets the date: the last frost is over around 29 March, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 15 May, 47 days later.

Last spring frost	29 March
Top 7 cm of soil at 18 °C	15 May, 47 days after the last frost
First autumn frost	6 November, 175 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	20 June – 25 September
Days left for picking	139
Daylight	13:29 on 24 April, 14:11 on 15 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 6 rainy days

The same dates in Seoul hold for Cucumber, Bell Pepper, Eggplant, Pumpkin and Watermelon.

Zucchini in Seoul: care after planting

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

Pests and diseases of zucchini to watch for:

Weather in Seoul during the zucchini season

About 1097 mm of rain falls in the season; November is the driest month (52 mm) and July the wettest (310 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	22.7	12.1	107	9	14:11
June	27.1	17.7	126	10	14:45
July	29.3	22.4	310	17	14:31
August	29.5	22.5	276	16	13:38
September	25.3	17.4	148	10	12:28
October	18.5	9.5	78	7	11:16
November	11.1	1.6	52	6	10:10

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

All the nearest cities on our list plant zucchini later than Seoul; the closest date is in Daegu, 1 day later.

City	Distance	Date	Difference
Chuncheon	74 km	24 May – 14 August	9 days later
Daejeon	139 km	17 May – 26 August	2 days later
Gangneung	169 km	17 May – 4 September	2 days later
Jeonju	194 km	19 May – 31 August	4 days later
Daegu	236 km	16 May – 4 September	1 day later
Gwangju	266 km	17 May – 6 September	2 days later

Where to buy zucchini plants and seeds near Seoul

Buy plants ready to set out from 15 May to 20 August (from 24 April to 20 August for an unheated greenhouse); seed for raising your own is sown from 3 April to 30 July. Within 15 km of Seoul OpenStreetMap lists 1 garden centre, 2 plant nurseries and 85 markets (collected 28 October 2026).

Malli market — market
3 km
Seoul Jungang Market — market
3 km
방실농원 — garden centre
동구릉로53번길 227-11, 11911 구리시 · 13 km
Tongin Market — market
자하문로15길 18, 03036 서울특별시 · 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