Courgette · Zhenjiang, Jiangsu, China
When to plant courgettes in Zhenjiang
Main outdoor window
2-16 Apr
The window this page is built around.
Timed from last spring frost
19 March
In Zhenjiang, on your chosen risk.
Ready to pick
17 May - 1 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 Zhenjiang
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
26 Feb - 12 Mar
Three weeks before your last frost, under cover or on a windowsill.
Sow direct
2-16 Apr
Two weeks after your last frost.
Plant out
2-16 Apr
Two weeks after your last frost.
Harvest
17 May - 1 Jun
Courgettes through the year
Against the frost risk in Zhenjiang
Why these dates
Two plants feed most households. A single sowing two weeks after last frost is usually enough; a July sowing gives cleaner, mildew-free fruit in long-season climates.
One light frost ends the plant. Because it crops so quickly, a courgette sown after all frost risk has passed still produces for months.
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. Courgettes 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 Zhenjiang.
The median frost-free season here is 252 days, against 45 to 60 days to maturity for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Also in Zhenjiang
Other vegetables to time
Growing courgettes in Zhenjiang
When should I plant courgettes in Zhenjiang?
Aim for 2-16 Apr in an average year. If you would rather not gamble on the weather, wait until 13-27 Apr - by then frost has finished in nine years out of ten.
When will courgettes be ready to harvest in Zhenjiang?
Expect to start picking around 17 May - 1 Jun, based on 45 to 60 days to maturity from the planting date calculated for this location.
How much frost will courgettes tolerate?
One light frost ends the plant. Because it crops so quickly, a courgette sown after all frost risk has passed still produces for months.