When to plant summer squash / zucchini in Birmingham

Summer squash / Zucchini is frost-tender, so every date keys off Birmingham's last spring frost of Mar 27.
Step 1 · Sow
Start seeds indoors
Mar 28 – Apr 18
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 18 – May 9
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 2 – Jun 17
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Birmingham's 229-day season leaves this much room.
Summer squash / Zucchini on Birmingham'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
MAR 27
NOV 11

Common questions

When can I sow summer squash / zucchini outdoors in Birmingham?

Direct-sow around mid April (Apr 18–May 9) in Birmingham, based on its local frost dates. Confidence 89%.

When will summer squash / zucchini be ready to harvest in Birmingham?

Expect to harvest from around early June (Jun 2–Jun 17) in Birmingham, based on its local frost dates. Confidence 80%.

When should I start summer squash / zucchini seeds indoors in Birmingham?

Start seeds indoors around late March (Mar 28–Apr 18) in Birmingham, based on its local frost dates. Confidence 85%.

When can I transplant summer squash / zucchini outdoors in Birmingham?

Transplant outdoors around mid April (Apr 18–May 9) in Birmingham, based on its local frost dates. Confidence 89%.

How long is the growing season in Birmingham?

Birmingham has roughly 229 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 Birmingham's frost dates.

Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.