When to plant summer squash / zucchini in Houston
Summer squash / Zucchini is frost-tender, so every date keys off Houston's last spring frost of Jan 26.
Step 1 · Sow
Start seeds indoors
Feb 19 – Mar 12
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Mar 12 – Apr 2
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Apr 26 – May 11
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Houston's 317-day season leaves this much room.
Summer squash / Zucchini on Houston'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
JAN 26
DEC 9
Common questions
When can I sow summer squash / zucchini outdoors in Houston?
Direct-sow around mid March (Mar 12–Apr 2) in Houston, based on its local frost dates. Confidence 84%.
When will summer squash / zucchini be ready to harvest in Houston?
Expect to harvest from around late April (Apr 26–May 11) in Houston, based on its local frost dates. Confidence 76%.
When should I start summer squash / zucchini seeds indoors in Houston?
Start seeds indoors around mid February (Feb 19–Mar 12) in Houston, based on its local frost dates. Confidence 80%.
When can I transplant summer squash / zucchini outdoors in Houston?
Transplant outdoors around mid March (Mar 12–Apr 2) in Houston, based on its local frost dates. Confidence 84%.
How long is the growing season in Houston?
Houston has roughly 317 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 Houston's frost dates.
Confidence 84/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.