When to plant summer squash / zucchini in Tulsa
Summer squash / Zucchini is frost-tender, so every date keys off Tulsa's last spring frost of Mar 31.
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 26 – May 17
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 10 – Jun 25
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Tulsa's 214-day season leaves this much room.
Summer squash / Zucchini on Tulsa'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
MAR 31
NOV 3
Common questions
When can I sow summer squash / zucchini outdoors in Tulsa?
Direct-sow around late April (Apr 26–May 17) in Tulsa, based on its local frost dates. Confidence 85%.
When will summer squash / zucchini be ready to harvest in Tulsa?
Expect to harvest from around early June (Jun 10–Jun 25) in Tulsa, based on its local frost dates. Confidence 79%.
When should I start summer squash / zucchini seeds indoors in Tulsa?
Start seeds indoors around early April (Apr 1–Apr 22) in Tulsa, based on its local frost dates. Confidence 84%.
When can I transplant summer squash / zucchini outdoors in Tulsa?
Transplant outdoors around late April (Apr 26–May 17) in Tulsa, based on its local frost dates. Confidence 85%.
How long is the growing season in Tulsa?
Tulsa has roughly 214 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 Tulsa's frost dates.
Confidence 88/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.