When to plant tomatoes in Jeonju: 25 April – 28 July

In Jeonju, tomato: sow for seedlings from 11 February to 6 June; plant into a greenhouse from 4 April to 28 July; plant out into open ground from 25 April to 28 July.

Tomato in Jeonju: soil, season and weather

In Jeonju the soil, not frost, sets the date: the last frost is over around 27 March, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 25 April, 29 days later.

Last spring frost	27 March
Top 7 cm of soil at 15 °C	25 April, 29 days after the last frost
Into an unheated greenhouse	4 April – 28 July; April outside: 7.3 °C at night, 17.9 °C by day; card 16–27 °C
First autumn frost	17 November, 206 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	4 July – 6 October
Days left for picking	136
Daylight	11:30 on 4 March, 13:26 on 25 April
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 7 rainy days

Tomato in Jeonju: care after planting

Planted on 25 April: in the first weeks water every 4 days.

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

25 April — feed: balanced (NPK)
23 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 Jeonju during the tomato season

Days average above the tomato card's 16–27 °C in July (28.7 °C) and August (29.5 °C). Months that stay below 16 °C even by day on average: November (12.3 °C). Nights average below 16 °C in April, May and October, November (3.5–12 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	17.9	7.3	86	9	13:05
May	22.3	12	106	10	14:03
June	26.3	17.1	150	13	14:34
July	28.7	21.7	267	19	14:22
August	29.5	22.1	232	18	13:32
September	25.4	17.6	178	12	12:26
October	19	10.4	85	8	11:19
November	12.3	3.5	55	7	10:18

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

All the nearest cities on our list plant tomato earlier than Jeonju; the closest date is in Daejeon, 1 day earlier.

City	Distance	Date	Difference
Daejeon	63 km	24 April – 23 July	1 day earlier
Gwangju	77 km	24 April – 3 August	1 day earlier
Daegu	131 km	22 April – 1 August	3 days earlier
Busan	188 km	21 April – 2 August	4 days earlier
Seoul	194 km	24 April – 17 July	1 day earlier
Ulsan	198 km	22 April – 27 July	3 days earlier

Where to buy tomato plants and seeds near Jeonju

Buy plants ready to set out from 25 April to 28 July (from 4 April to 28 July for an unheated greenhouse); seed for raising your own is sown from 11 February to 6 June. Within 15 km of Jeonju OpenStreetMap lists 7 markets (collected 28 October 2026).

Jeonju National Agricultural Cooperative Federation Gongpanjang — market
5 km
모래내시장 — market
2 km
농수산시장 — market
6 km
Samnye Traditional Market — market
12 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