Cucumber · Centurion, Gauteng, South Africa
When to plant cucumbers in Centurion
Main outdoor window
19 Aug - 2 Sep
The window this page is built around.
Timed from last spring frost
5 August
In Centurion, on your chosen risk.
Ready to pick
8-28 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 Centurion
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
15-29 Jul
Three weeks before your last frost, under cover or on a windowsill.
Sow direct
19 Aug - 2 Sep
Two weeks after your last frost.
Plant out
19 Aug - 2 Sep
Two weeks after your last frost.
Harvest
8-28 Oct
Cucumbers through the year
Against the frost risk in Centurion
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 Centurion.
The median frost-free season here is 304 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 Centurion
Other vegetables to time
Growing cucumbers in Centurion
When should I plant cucumbers in Centurion?
Aim for 19 Aug - 2 Sep in an average year. If you would rather not gamble on the weather, wait until 13-27 Sep - by then frost has finished in nine years out of ten.
When will cucumbers be ready to harvest in Centurion?
Expect to start picking around 8-28 Oct, 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.