When to plant tomatoes in Daejeon: 24 April – 23 July

In Daejeon, tomato: sow for seedlings from 10 February to 1 June; plant into a greenhouse from 3 April to 23 July; plant out into open ground from 24 April to 23 July.

Tomato in Daejeon: soil, season and weather

In Daejeon the soil, not frost, sets the date: the last frost is over around 1 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 24 April, 23 days later.

Last spring frost	1 April
Top 7 cm of soil at 15 °C	24 April, 23 days after the last frost
Into an unheated greenhouse	3 April – 23 July; April outside: 6.8 °C at night, 18.5 °C by day; card 16–27 °C
First autumn frost	12 November, 202 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	3 July – 1 October
Days left for picking	132
Daylight	11:27 on 3 March, 13:25 on 24 April
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 5 rainy days

Tomato in Daejeon: 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 Daejeon during the tomato season

Days average above the tomato card's 16–27 °C in June (27.4 °C), July (29.2 °C) and August (30 °C). Months that stay below 16 °C even by day on average: November (12.1 °C). Nights average below 16 °C in April, May and October, November (2.4–11.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	18.5	6.8	73	7	13:06
May	23.2	11.8	89	9	14:05
June	27.4	17.1	145	11	14:37
July	29.2	21.6	265	17	14:25
August	30	22	219	18	13:34
September	25.2	17.2	168	11	12:27
October	18.7	9.8	78	8	11:18
November	12.1	2.4	45	5	10:15

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

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

City	Distance	Date	Difference
Jeonju	63 km	25 April – 28 July	1 day later
Daegu	121 km	22 April – 1 August	2 days earlier
Seoul	139 km	24 April – 17 July	same day
Gwangju	140 km	24 April – 3 August	same day
Chuncheon	172 km	13 May – 11 July	19 days later
Ulsan	195 km	22 April – 27 July	2 days earlier

Where to buy tomato plants and seeds near Daejeon

Buy plants ready to set out from 24 April to 23 July (from 3 April to 23 July for an unheated greenhouse); seed for raising your own is sown from 10 February to 1 June. Within 15 km of Daejeon OpenStreetMap lists 24 markets and 1 farm shop (collected 28 October 2026).

축산물도매시장 — market
한밭대로1003번길 161-67, 34377 대전광역시 · 2 km
Sin Jungang Market — market
5 km
Songgang Market — market
10 km
Dasomuiwon — market
1 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