When to plant leek in Milwaukee
Leek is cold-hardy, so every date keys off Milwaukee's frost dates of Apr 23.
Step 1 · Sow
Start seeds indoors
Feb 12 – Mar 5
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 22 – May 13
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 31 – Aug 20
Picking runs until conditions turn against the crop.
Window
Days to maturity
100 – 120 d
Milwaukee's 182-day season leaves this much room.
Leek on Milwaukee'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 23
OCT 23
Common questions
When will leek be ready to harvest in Milwaukee?
Expect to harvest from around late July (Jul 31–Aug 20) in Milwaukee, based on its local frost dates. Confidence 80%.
When should I start leek seeds indoors in Milwaukee?
Start seeds indoors around mid February (Feb 12–Mar 5) in Milwaukee, based on its local frost dates. Confidence 85%.
When can I transplant leek outdoors in Milwaukee?
Transplant outdoors around late April (Apr 22–May 13) in Milwaukee, based on its local frost dates. Confidence 86%.
How long is the growing season in Milwaukee?
Milwaukee has roughly 182 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 Milwaukee's frost dates.
Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.