When to plant kale in Green Bay

Kale is cold-hardy, so every date keys off Green Bay's frost dates of May 4.
Step 1 · Sow
Start seeds indoors
Mar 23 – Apr 13
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 17 – May 8
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 11 – Jul 1
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Jul 1 – Jul 15
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Sep 1 – Sep 21
Maturity window for the second sowing.
Window
Days to maturity
55 – 75 d
Green Bay's 152-day season leaves this much room.
Kale on Green Bay'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
MAY 4
OCT 5

Common questions

When can I sow kale outdoors in Green Bay?

Direct-sow around mid April (Apr 17–May 8) in Green Bay, based on its local frost dates. Confidence 85%.

When will kale be ready to harvest in Green Bay?

Expect to harvest from around mid June (Jun 11–Jul 1) in Green Bay, based on its local frost dates. Confidence 79%.

When should I start kale seeds indoors in Green Bay?

Start seeds indoors around late March (Mar 23–Apr 13) in Green Bay, based on its local frost dates. Confidence 84%.

When can I transplant kale outdoors in Green Bay?

Transplant outdoors around mid April (Apr 17–May 8) in Green Bay, based on its local frost dates. Confidence 85%.

Can I plant kale in autumn in Green Bay?

Yes — Green Bay supports a second, autumn sowing of kale around early July (Jul 1–Jul 15), timed to mature before the first fall frost.

How long is the growing season in Green Bay?

Green Bay has roughly 152 frost-free days, which is enough time to grow kale to maturity outdoors.

The rule of thumb

Sow kale 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 Green Bay's frost dates.

Confidence 88/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.