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When to plant swiss chard in San Antonio

Swiss chard is cold-hardy, so every date keys off San Antonio's frost dates of Feb 21.
Step 1 · Sow
Start seeds indoors
Jan 24 – Feb 14
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Feb 7 – Feb 28
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Mar 29 – Apr 8
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Aug 28 – Sep 11
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Oct 24 – Nov 3
Maturity window for the second sowing.
Window
Days to maturity
50 – 60 d
San Antonio's 282-day season leaves this much room.
Swiss chard 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 swiss chard outdoors in San Antonio?

Direct-sow around early February (Feb 7–Feb 28) in San Antonio, based on its local frost dates. Confidence 83%.

When will swiss chard be ready to harvest in San Antonio?

Expect to harvest from around late March (Mar 29–Apr 8) in San Antonio, based on its local frost dates. Confidence 75%.

When should I start swiss chard seeds indoors in San Antonio?

Start seeds indoors around late January (Jan 24–Feb 14) in San Antonio, based on its local frost dates. Confidence 79%.

When can I transplant swiss chard outdoors in San Antonio?

Transplant outdoors around early February (Feb 7–Feb 28) in San Antonio, based on its local frost dates. Confidence 83%.

Can I plant swiss chard in autumn in San Antonio?

Yes — San Antonio supports a second, autumn sowing of swiss chard around late August (Aug 28–Sep 11), 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 swiss chard to maturity outdoors.

The rule of thumb

Sow swiss chard 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.
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