When to plant leek in Cincinnati
Leek is cold-hardy, so every date keys off Cincinnati's frost dates of Apr 13.
Step 1 · Sow
Start seeds indoors
Feb 2 – Feb 23
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Mar 30 – Apr 20
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 8 – Jul 28
Picking runs until conditions turn against the crop.
Window
Days to maturity
100 – 120 d
Cincinnati's 194-day season leaves this much room.
Leek on Cincinnati'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 13
OCT 22
Common questions
When will leek be ready to harvest in Cincinnati?
Expect to harvest from around early July (Jul 8–Jul 28) in Cincinnati, based on its local frost dates. Confidence 79%.
When should I start leek seeds indoors in Cincinnati?
Start seeds indoors around early February (Feb 2–Feb 23) in Cincinnati, based on its local frost dates. Confidence 84%.
When can I transplant leek outdoors in Cincinnati?
Transplant outdoors around late March (Mar 30–Apr 20) in Cincinnati, based on its local frost dates. Confidence 88%.
How long is the growing season in Cincinnati?
Cincinnati has roughly 194 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 Cincinnati's frost dates.
Confidence 88/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.