Winter melon · Gunpo, Gyeonggi-do, South Korea
When to plant winter melons in Gunpo
Main outdoor window
17 Apr - 8 May
The window this page is built around.
Timed from last spring frost
3 April
In Gunpo, on your chosen risk.
Ready to pick
1 Sep - 30 Nov
If you plant at the start of the window.
The average last frost. Half of all years are later than this.
Step by step in Gunpo
Each window is a range, not a single day. Earlier in the range buys you a longer season; later in it buys you a safer one.
Start indoors
27 Feb - 20 Mar
Five weeks before your last frost, under cover or on a windowsill.
Plant out
17 Apr - 8 May
Two weeks after your last frost.
Harvest
1 Sep - 30 Nov
Winter melons through the year
Against the frost risk in Gunpo
Why these dates
Start indoors five weeks before the last frost and plant out two weeks after it. It needs a longer warm run than a pumpkin, so it is marginal in cool summers.
Killed at 0C. The wax bloom that makes it store so well only develops on fully mature fruit, which needs the whole season.
Seed packets and extension guides express timing as weeks either side of the last spring frost, because that is the only reference point that travels. Winter melons are timed from 5 weeks before that frost for an indoor start, with planting out 2 weeks after it, and this page simply resolves those offsets against the frost date computed for Gunpo.
The median frost-free season here is 223 days, against 110 to 140 days to maturity for this crop counted from planting out. That margin is what decides whether a late sowing is worth attempting.
Also in Gunpo
Other vegetables to time
Growing winter melons in Gunpo
When should I plant winter melons in Gunpo?
Aim for 17 Apr - 8 May in an average year. If you would rather not gamble on the weather, wait until 26 Apr - 17 May - by then frost has finished in nine years out of ten.
When will winter melons be ready to harvest in Gunpo?
Expect to start picking around 1 Sep - 30 Nov, based on 110 to 140 days to maturity from the planting date calculated for this location.
How much frost will winter melons tolerate?
Killed at 0C. The wax bloom that makes it store so well only develops on fully mature fruit, which needs the whole season.