When to plant summer squash / zucchini in Oklahoma City

Summer squash / Zucchini is frost-tender, so every date keys off Oklahoma City's last spring frost of Apr 3.
Step 1 · Sow
Start seeds indoors
Apr 1 – Apr 22
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 27 – May 18
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 11 – Jun 26
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Oklahoma City's 223-day season leaves this much room.
Summer squash / Zucchini on Oklahoma City'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
APR 3
NOV 5

Common questions

When can I sow summer squash / zucchini outdoors in Oklahoma City?

Direct-sow around late April (Apr 27–May 18) in Oklahoma City, based on its local frost dates. Confidence 85%.

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

Expect to harvest from around mid June (Jun 11–Jun 26) in Oklahoma City, based on its local frost dates. Confidence 79%.

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

Start seeds indoors around early April (Apr 1–Apr 22) in Oklahoma City, based on its local frost dates. Confidence 84%.

When can I transplant summer squash / zucchini outdoors in Oklahoma City?

Transplant outdoors around late April (Apr 27–May 18) in Oklahoma City, based on its local frost dates. Confidence 85%.

How long is the growing season in Oklahoma City?

Oklahoma City has roughly 223 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 Oklahoma City's frost dates.

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