When to plant zucchini in Gangneung: 17 May – 4 September

In Gangneung, zucchini: sow for seedlings from 5 April to 14 August; plant into a greenhouse from 26 April to 4 September; plant out into open ground from 17 May to 4 September.

Zucchini in Gangneung: soil, season and weather

In Gangneung 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 zucchini card — only around 17 May, 59 days later.

Last spring frost	19 March
Top 7 cm of soil at 18 °C	17 May, 59 days after the last frost
First autumn frost	21 November, 188 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	22 June – 10 October
Days left for picking	152
Daylight	13:34 on 26 April, 14:15 on 17 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 6 rainy days

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

Zucchini in Gangneung: care after planting

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

Pests and diseases of zucchini to watch for:

Weather in Gangneung during the zucchini season

About 1157 mm of rain falls in the season; November is the driest month (48 mm) and August the wettest (307 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	21.6	13.3	75	9	14:11
June	25	18.1	100	10	14:46
July	27.9	22.4	229	15	14:32
August	28.4	22.8	307	17	13:39
September	23.9	18	226	15	12:28
October	18.4	11.6	172	12	11:16
November	13.1	5.1	48	6	10:10

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Gangneung, Seoul is 2 days earlier and Chuncheon 7 days later.

City	Distance	Date	Difference
Chuncheon	103 km	24 May – 14 August	7 days later
Seoul	169 km	15 May – 20 August	2 days earlier
Daejeon	205 km	17 May – 26 August	same day
Daegu	211 km	16 May – 4 September	1 day earlier
Ulsan	248 km	18 May – 30 August	1 day later
Jeonju	265 km	19 May – 31 August	2 days later

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