When to plant tomatoes in Seoul: 24 April – 17 July

In Seoul, tomato: sow for seedlings from 10 February to 26 May; plant into a greenhouse from 3 April to 17 July; plant out into open ground from 24 April to 17 July. For plants and seeds, the places nearby include 방실농원 (garden centre, 13 km); addresses and opening hours are below.

Tomato 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 15 °C — the minimum on the tomato card — only around 24 April, 26 days later.

Last spring frost	29 March
Top 7 cm of soil at 15 °C	24 April, 26 days after the last frost
Into an unheated greenhouse	3 April – 17 July; April outside: 6.7 °C at night, 17.8 °C by day; card 16–27 °C
First autumn frost	6 November, 196 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	3 July – 25 September
Days left for picking	126
Daylight	11:26 on 3 March, 13:29 on 24 April
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 6 rainy days

Tomato in Seoul: care after planting

Planted on 24 April: in the first weeks water every 4 days.

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

24 April — feed: balanced (NPK)
22 May — feed: nitrogen

Pests and diseases of tomato 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 Seoul during the tomato season

Days average above the tomato card's 16–27 °C in June (27.1 °C), July (29.3 °C) and August (29.5 °C). Months that stay below 16 °C even by day on average: November (11.1 °C). Nights average below 16 °C in April, May and October, November (1.6–12.1 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	17.8	6.7	63	7	13:09
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

Tomato in nearby cities

Around Seoul, Daegu is 2 days earlier and Chuncheon 19 days later.

City	Distance	Date	Difference
Chuncheon	74 km	13 May – 11 July	19 days later
Daejeon	139 km	24 April – 23 July	same day
Gangneung	169 km	28 April – 1 August	4 days later
Jeonju	194 km	25 April – 28 July	1 day later
Daegu	236 km	22 April – 1 August	2 days earlier
Gwangju	266 km	24 April – 3 August	same day

Where to buy tomato plants and seeds near Seoul

Buy plants ready to set out from 24 April to 17 July (from 3 April to 17 July for an unheated greenhouse); seed for raising your own is sown from 10 February to 26 May. Within 15 km of Seoul OpenStreetMap lists 1 garden centre, 2 plant nurseries and 85 markets (collected 28 October 2026).

방실농원 — garden centre
동구릉로53번길 227-11, 11911 구리시 · 13 km
Tongin Market — market
자하문로15길 18, 03036 서울특별시 · 3 km
Mangwon Market — market
Mon–Sun 09:00–21:00 · 7 km
증산종합시장 — market
증산로3길 12, 03500 서울특별시 · 8 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.

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