When to plant summer squash / zucchini in San Antonio

Summer squash / Zucchini is frost-tender, so every date keys off San Antonio's last spring frost of Feb 21.
Step 1 · Sow
Start seeds indoors
Feb 20 – Mar 13
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Mar 13 – Apr 3
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Apr 27 – May 12
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
San Antonio's 282-day season leaves this much room.
Summer squash / Zucchini on San Antonio'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
FEB 21
NOV 29

Common questions

When can I sow summer squash / zucchini outdoors in San Antonio?

Direct-sow around mid March (Mar 13–Apr 3) in San Antonio, based on its local frost dates. Confidence 83%.

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

Expect to harvest from around late April (Apr 27–May 12) in San Antonio, based on its local frost dates. Confidence 75%.

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

Start seeds indoors around mid February (Feb 20–Mar 13) in San Antonio, based on its local frost dates. Confidence 79%.

When can I transplant summer squash / zucchini outdoors in San Antonio?

Transplant outdoors around mid March (Mar 13–Apr 3) in San Antonio, based on its local frost dates. Confidence 83%.

How long is the growing season in San Antonio?

San Antonio has roughly 282 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 San Antonio's frost dates.

Confidence 83/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.