When to plant tomatoes in Ulsan: 22 April – 27 July

In Ulsan, tomato: sow for seedlings from 8 February to 5 June; plant into a greenhouse from 1 April to 27 July; plant out into open ground from 22 April to 27 July. For plants and seeds, the places nearby include 조운어바웃플랜츠 (garden centre, 12 km); addresses and opening hours are below.

Tomato in Ulsan: soil, season and weather

In Ulsan the soil, not frost, sets the date: the last frost is over around 22 March, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 22 April, 31 days later.

Last spring frost	22 March
Top 7 cm of soil at 15 °C	22 April, 31 days after the last frost
Into an unheated greenhouse	1 April – 27 July; April outside: 7.8 °C at night, 18.1 °C by day; card 16–27 °C
First autumn frost	16 November, 208 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	1 July – 5 October
Days left for picking	138
Daylight	11:24 on 1 March, 13:19 on 22 April
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 4 rainy days

Tomato in Ulsan: care after planting

Planted on 22 April: in the first weeks water every 4 days.

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

22 April — feed: balanced (NPK)
20 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 Ulsan during the tomato season

Days average above the tomato card's 16–27 °C in July (28.9 °C) and August (29.7 °C). Months that stay below 16 °C even by day on average: November (14.7 °C). Nights average below 16 °C in April, May and October, November (4.3–12.5 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	18.1	7.8	104	8	13:04
May	22.6	12.5	112	9	14:02
June	25.9	17.4	180	11	14:33
July	28.9	22.3	266	16	14:21
August	29.7	22.9	216	16	13:32
September	25	18.6	268	16	12:26
October	20	11.8	120	9	11:20
November	14.7	4.3	37	4	10:19

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Ulsan, Kitakyushu is 8 days earlier and Jeonju 3 days later.

City	Distance	Date	Difference
Busan	47 km	21 April – 2 August	1 day earlier
Daegu	74 km	22 April – 1 August	same day
Daejeon	195 km	24 April – 23 July	2 days later
Jeonju	198 km	25 April – 28 July	3 days later
Gwangju	228 km	24 April – 3 August	2 days later
Kitakyushu	234 km	from 14 April	8 days earlier

Where to buy tomato plants and seeds near Ulsan

Buy plants ready to set out from 22 April to 27 July (from 1 April to 27 July for an unheated greenhouse); seed for raising your own is sown from 8 February to 5 June. Within 15 km of Ulsan OpenStreetMap lists 1 garden centre, 8 markets and 1 farm shop (collected 28 October 2026).

조운어바웃플랜츠 — garden centre
서진3길 22, 44109 울산광역시 · 12 km
전하시장 — market
녹수1길(Noksu 1-gil) 6, 울산광역시 · 11 km
월봉시장(Wolbong Market) — market
화정6길 16, 울산광역시 · 11 km
Ulsannongsusanmul Wholesale Market — market
2 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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