Pumpkin · Seongnam-si, Gyeonggi-do, South Korea
When to plant pumpkins in Seongnam-si
Main outdoor window
17 Apr - 1 May
The window this page is built around.
Timed from last spring frost
3 April
In Seongnam-si, on your chosen risk.
Ready to pick
16 Jul - 15 Aug
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 Seongnam-si
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
13-27 Mar
Three weeks before your last frost, under cover or on a windowsill.
Sow direct
17 Apr - 1 May
Two weeks after your last frost.
Plant out
17 Apr - 1 May
Two weeks after your last frost.
Harvest
16 Jul - 15 Aug
Pumpkins through the year
Against the frost risk in Seongnam-si
Why these dates
If your frost-free season is shorter than 110 days, start indoors and choose a smaller cultivar. Giant pumpkins are a long-season crop, not a beginner one.
Foliage dies at the first frost, but mature fruit tolerates a light touch. Harvest before a hard frost or the flesh will not store.
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. Pumpkins are timed from 3 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 Seongnam-si.
The median frost-free season here is 223 days, against 90 to 120 days to maturity for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Also in Seongnam-si
Other vegetables to time
Growing pumpkins in Seongnam-si
When should I plant pumpkins in Seongnam-si?
Aim for 17 Apr - 1 May in an average year. If you would rather not gamble on the weather, wait until 26 Apr - 10 May - by then frost has finished in nine years out of ten.
When will pumpkins be ready to harvest in Seongnam-si?
Expect to start picking around 16 Jul - 15 Aug, based on 90 to 120 days to maturity from the planting date calculated for this location.
How much frost will pumpkins tolerate?
Foliage dies at the first frost, but mature fruit tolerates a light touch. Harvest before a hard frost or the flesh will not store.