Cucumber · Chinju, Gyeongsangnam-do, South Korea
When to plant cucumbers in Chinju
Main outdoor window
10-24 Apr
The window this page is built around.
Timed from last spring frost
27 March
In Chinju, on your chosen risk.
Ready to pick
30 May - 19 Jun
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 Chinju
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
6-20 Mar
Three weeks before your last frost, under cover or on a windowsill.
Sow direct
10-24 Apr
Two weeks after your last frost.
Plant out
10-24 Apr
Two weeks after your last frost.
Harvest
30 May - 19 Jun
Cucumbers through the year
Against the frost risk in Chinju
Why these dates
Only three weeks indoors: cucumbers hate root disturbance, so sow into modules or pots you can plant whole. A second sowing three weeks after the first extends picking by a month.
Cold soil rots cucumber seed before it germinates. If soil is below 18C, wait - the seed is cheaper than the fortnight you would lose.
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. Cucumbers 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 Chinju.
The median frost-free season here is 240 days, against 50 to 70 days to maturity for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Also in Chinju
Other vegetables to time
Growing cucumbers in Chinju
When should I plant cucumbers in Chinju?
Aim for 10-24 Apr 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 cucumbers be ready to harvest in Chinju?
Expect to start picking around 30 May - 19 Jun, based on 50 to 70 days to maturity from the planting date calculated for this location.
How much frost will cucumbers tolerate?
Cold soil rots cucumber seed before it germinates. If soil is below 18C, wait - the seed is cheaper than the fortnight you would lose.