Yardlong bean · Gunpo, Gyeonggi-do, South Korea
When to plant yardlong beans 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 Jul - 31 Oct
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
13 Mar - 3 Apr
Three weeks before your last frost, under cover or on a windowsill.
Sow direct
17 Apr - 8 May
Two weeks after your last frost.
Plant out
17 Apr - 8 May
Two weeks after your last frost.
Harvest
1 Jul - 31 Oct
Yardlong beans through the year
Against the frost risk in Gunpo
Why these dates
Sow two weeks after the last frost onto warm soil, up a tall support. Pick at about 40cm, before the seeds swell, and pick every second day.
Killed at 0C. Growth stalls below 18C, so in cool summers the plant climbs without ever flowering usefully.
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. Yardlong beans 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 Gunpo.
The median frost-free season here is 223 days, against 60 to 80 days to maturity for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Nearby
Yardlong beans in places close by
Also in Gunpo
Other vegetables to time
Growing yardlong beans in Gunpo
When should I plant yardlong beans 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 yardlong beans be ready to harvest in Gunpo?
Expect to start picking around 1 Jul - 31 Oct, based on 60 to 80 days to maturity from the planting date calculated for this location.
How much frost will yardlong beans tolerate?
Killed at 0C. Growth stalls below 18C, so in cool summers the plant climbs without ever flowering usefully.