Courgette · Sasebo, Nagasaki, Japan
When to plant courgettes in Sasebo
Main outdoor window
3-17 Mar
The window this page is built around.
Timed from last spring frost
17 February
In Sasebo, on your chosen risk.
Ready to pick
17 Apr - 2 May
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 Sasebo
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 Jan - 10 Feb
Three weeks before your last frost, under cover or on a windowsill.
Sow direct
3-17 Mar
Two weeks after your last frost.
Plant out
3-17 Mar
Two weeks after your last frost.
Harvest
17 Apr - 2 May
Courgettes through the year
Against the frost risk in Sasebo
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 Sasebo.
The median frost-free season here is 309 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 Sasebo
Other vegetables to time
Growing courgettes in Sasebo
When should I plant courgettes in Sasebo?
Aim for 3-17 Mar in an average year. If you would rather not gamble on the weather, wait until 18 Mar - 1 Apr - by then frost has finished in nine years out of ten.
When will courgettes be ready to harvest in Sasebo?
Expect to start picking around 17 Apr - 2 May, 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.