When to plant summer squash / zucchini in Green Bay
Summer squash / Zucchini is frost-tender, so every date keys off Green Bay's last spring frost of May 4.
Step 1 · Sow
Start seeds indoors
May 2 – May 23
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Jun 7 – Jun 28
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 22 – Aug 6
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Green Bay's 152-day season leaves this much room.
Summer squash / Zucchini 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
FROST
FROST
MAY 4
OCT 5
Common questions
When can I sow summer squash / zucchini outdoors in Green Bay?
Direct-sow around early June (Jun 7–Jun 28) in Green Bay, based on its local frost dates. Confidence 85%.
When will summer squash / zucchini be ready to harvest in Green Bay?
Expect to harvest from around late July (Jul 22–Aug 6) in Green Bay, based on its local frost dates. Confidence 79%.
When should I start summer squash / zucchini seeds indoors in Green Bay?
Start seeds indoors around early May (May 2–May 23) in Green Bay, based on its local frost dates. Confidence 84%.
When can I transplant summer squash / zucchini outdoors in Green Bay?
Transplant outdoors around early June (Jun 7–Jun 28) in Green Bay, based on its local frost dates. Confidence 85%.
How long is the growing season in Green Bay?
Green Bay has roughly 152 frost-free days, which is enough time to grow summer squash / zucchini to maturity outdoors.
The rule of thumb
Sow summer squash / zucchini 6–8 weeks before your last spring frost; plant out 2–3 weeks after it. 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.