When to plant leek in Sydney
Leek is cold-hardy, so every date keys off Sydney's frost dates of Jul 25.
Step 1 · Sow
Start seeds indoors
May 16 – Jun 6
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Jul 11 – Aug 1
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Oct 19 – Nov 8
Picking runs until conditions turn against the crop.
Window
Days to maturity
100 – 120 d
Sydney's 345-day season leaves this much room.
Leek on Sydney's growing year
Frost-bounded season with crops mapped onto the 12-month axis.
Frost risk Growing Harvest
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
JUL 25
JUL 5
Common questions
When will leek be ready to harvest in Sydney?
Expect to harvest from around mid October (Oct 19–Nov 8) in Sydney, based on its local frost dates. Confidence 76%.
When should I start leek seeds indoors in Sydney?
Start seeds indoors around mid May (May 16–Jun 6) in Sydney, based on its local frost dates. Confidence 80%.
When can I transplant leek outdoors in Sydney?
Transplant outdoors around mid July (Jul 11–Aug 1) in Sydney, based on its local frost dates. Confidence 84%.
How long is the growing season in Sydney?
Sydney has roughly 345 frost-free days, which is enough time to grow leek to maturity outdoors.
The rule of thumb
Sow leek as soon as the soil is workable — it tolerates cool weather and light frost. Every date on this page is derived from that rule and Sydney's frost dates.
Confidence 84/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.