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When to plant swiss chard in Oklahoma City

Swiss chard is cold-hardy, so every date keys off Oklahoma City's frost dates of Apr 3.
Step 1 · Sow
Start seeds indoors
Mar 6 – Mar 27
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Mar 20 – Apr 10
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
May 9 – May 19
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Jul 29 – Aug 12
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Sep 24 – Oct 4
Maturity window for the second sowing.
Window
Days to maturity
50 – 60 d
Oklahoma City's 223-day season leaves this much room.
Swiss chard on Oklahoma City'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
APR 3
NOV 5

Common questions

When can I sow swiss chard outdoors in Oklahoma City?

Direct-sow around mid March (Mar 20–Apr 10) in Oklahoma City, based on its local frost dates. Confidence 88%.

When will swiss chard be ready to harvest in Oklahoma City?

Expect to harvest from around early May (May 9–May 19) in Oklahoma City, based on its local frost dates. Confidence 79%.

When should I start swiss chard seeds indoors in Oklahoma City?

Start seeds indoors around early March (Mar 6–Mar 27) in Oklahoma City, based on its local frost dates. Confidence 84%.

When can I transplant swiss chard outdoors in Oklahoma City?

Transplant outdoors around mid March (Mar 20–Apr 10) in Oklahoma City, based on its local frost dates. Confidence 88%.

Can I plant swiss chard in autumn in Oklahoma City?

Yes — Oklahoma City supports a second, autumn sowing of swiss chard around late July (Jul 29–Aug 12), timed to mature before the first fall frost.

How long is the growing season in Oklahoma City?

Oklahoma City has roughly 223 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 Oklahoma City's frost dates.

Confidence 88/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.
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