When to plant leek in Newark
Leek is cold-hardy, so every date keys off Newark's frost dates of Apr 3.
Step 1 · Sow
Start seeds indoors
Jan 23 – Feb 13
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 6 – Apr 27
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 15 – Aug 4
Picking runs until conditions turn against the crop.
Window
Days to maturity
100 – 120 d
Newark's 223-day season leaves this much room.
Leek on Newark'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
FROST
FROST
APR 3
NOV 11
Common questions
When will leek be ready to harvest in Newark?
Expect to harvest from around mid July (Jul 15–Aug 4) in Newark, based on its local frost dates. Confidence 77%.
When should I start leek seeds indoors in Newark?
Start seeds indoors around late January (Jan 23–Feb 13) in Newark, based on its local frost dates. Confidence 82%.
When can I transplant leek outdoors in Newark?
Transplant outdoors around early April (Apr 6–Apr 27) in Newark, based on its local frost dates. Confidence 83%.
How long is the growing season in Newark?
Newark has roughly 223 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 Newark's frost dates.
Confidence 86/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.