When to plant tomatoes in Chuncheon: 13 May – 11 July

In Chuncheon, tomato: sow for seedlings from 1 March to 20 May; plant into a greenhouse from 22 April to 11 July; plant out into open ground from 13 May to 11 July.

Tomato in Chuncheon: soil, season and weather

In Chuncheon the soil, not frost, sets the date: the last frost is over around 6 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 13 May, 37 days later.

Last spring frost	6 April
Top 7 cm of soil at 15 °C	13 May, 37 days after the last frost
Into an unheated greenhouse	22 April – 11 July; April outside: 5.1 °C at night, 16.9 °C by day; card 16–27 °C
First autumn frost	31 October, 171 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	22 July – 19 September
Days left for picking	101
Daylight	12:12 on 22 March, 14:08 on 13 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, October, has 7 rainy days

Tomato in Chuncheon: care after planting

Planted on 13 May: in the first weeks water every 4 days.

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

13 May — feed: balanced (NPK)
10 June — 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 Chuncheon during the tomato season

Days average above the tomato card's 16–27 °C in July (28.6 °C) and August (28.6 °C). Nights average below 16 °C in May (10.4 °C), September (15.5 °C) and October (7.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	21.9	10.4	103	9	14:12
June	26.4	16.1	125	11	14:46
July	28.6	20.7	287	18	14:33
August	28.6	20.8	277	16	13:39
September	24.3	15.5	153	11	12:28
October	17.6	7.8	79	7	11:16

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

All the nearest cities on our list plant tomato earlier than Chuncheon; the closest date is in Gangneung, 15 days earlier.

City	Distance	Date	Difference
Seoul	74 km	24 April – 17 July	19 days earlier
Gangneung	103 km	28 April – 1 August	15 days earlier
Daejeon	172 km	24 April – 23 July	19 days earlier
Jeonju	234 km	25 April – 28 July	18 days earlier
Daegu	235 km	22 April – 1 August	21 days earlier
Ulsan	294 km	22 April – 27 July	21 days earlier

Where to buy tomato plants and seeds near Chuncheon

Buy plants ready to set out from 13 May to 11 July (from 22 April to 11 July for an unheated greenhouse); seed for raising your own is sown from 1 March to 20 May. Within 15 km of Chuncheon OpenStreetMap lists 2 markets (collected 28 October 2026).

동부시장 — market
1 km
춘천시농수산물도매시장 — market
5 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