When to plant basil in San Antonio
Basil is frost-tender, so every date keys off San Antonio's last spring frost of Feb 21.
Step 1 · Sow
Start seeds indoors
Jan 30 – Feb 20
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
May 12 – Jun 11
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 90 d
San Antonio's 282-day season leaves this much room.
Basil 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
FROST
FROST
FEB 21
NOV 29
Common questions
When can I sow basil 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 basil be ready to harvest in San Antonio?
Expect to harvest from around mid May (May 12–Jun 11) in San Antonio, based on its local frost dates. Confidence 75%.
When should I start basil seeds indoors in San Antonio?
Start seeds indoors around late January (Jan 30–Feb 20) in San Antonio, based on its local frost dates. Confidence 79%.
When can I transplant basil 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 basil to maturity outdoors.
The rule of thumb
Sow basil 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.