When to plant watermelons in Chuncheon: 24 May – 22 July

In Chuncheon, watermelon: sow for seedlings from 5 April to 24 June; plant into a greenhouse from 3 May to 22 July; plant out into open ground from 24 May to 22 July.

Watermelon 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 18 °C — the minimum on the watermelon card — only around 24 May, 48 days later.

Last spring frost	6 April
Top 7 cm of soil at 18 °C	24 May, 48 days after the last frost
Into an unheated greenhouse	3 May – 22 July; May outside: 10.4 °C at night, 21.9 °C by day; card 18–35 °C
First autumn frost	31 October, 160 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	22 July – 19 September
Days left for picking	101
Daylight	13:34 on 26 April, 14:26 on 24 May
Watering outdoors when fruiting (card)	every 5 days; the driest month, October, has 7 rainy days

The same dates in Chuncheon hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Chuncheon: care after planting

Planted on 24 May: in the first weeks water every 5 days.

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

24 May — feed: balanced (NPK)

Pests and diseases of watermelon 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 watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 28.6 °C. Months that stay below 18 °C even by day on average: October (17.6 °C). Nights average below 18 °C in May, June and September, October (7.8–16.1 °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

Watermelon in nearby cities

All the nearest cities on our list plant watermelon earlier than Chuncheon; the closest date is in Jeonju, 5 days earlier.

City	Distance	Date	Difference
Seoul	74 km	15 May – 28 July	9 days earlier
Gangneung	103 km	17 May – 12 August	7 days earlier
Daejeon	172 km	17 May – 3 August	7 days earlier
Jeonju	234 km	19 May – 8 August	5 days earlier
Daegu	235 km	16 May – 12 August	8 days earlier
Ulsan	294 km	18 May – 7 August	6 days earlier

Where to buy watermelon plants and seeds near Chuncheon

Buy plants ready to set out from 24 May to 22 July (from 3 May to 22 July for an unheated greenhouse); seed for raising your own is sown from 5 April to 24 June. 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