When to plant spinach in San Antonio
Spinach is cold-hardy, so every date keys off San Antonio's frost dates of Feb 21.
Step 1 · Sow
Direct sow outdoors
Jan 10 – Jan 31
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Feb 19 – Mar 1
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Sep 19 – Oct 3
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Nov 5 – Nov 15
Maturity window for the second sowing.
Window
Days to maturity
40 – 50 d
San Antonio's 282-day season leaves this much room.
Spinach 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 spinach outdoors in San Antonio?
Direct-sow around early January (Jan 10–Jan 31) in San Antonio, based on its local frost dates. Confidence 83%.
When will spinach be ready to harvest in San Antonio?
Expect to harvest from around mid February (Feb 19–Mar 1) in San Antonio, based on its local frost dates. Confidence 75%.
Can I plant spinach in autumn in San Antonio?
Yes — San Antonio supports a second, autumn sowing of spinach around mid September (Sep 19–Oct 3), timed to mature before the first fall frost.
How long is the growing season in San Antonio?
San Antonio has roughly 282 frost-free days, which is enough time to grow spinach to maturity outdoors.
The rule of thumb
Sow spinach as soon as the soil is workable — it tolerates cool weather and light frost. 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.