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When to plant swiss chard in Phoenix

Swiss chard is cold-hardy, so every date keys off Phoenix's frost dates of Jan 27.
Step 1 · Sow
Start seeds indoors
Dec 30 – Jan 20
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Dec 27 – Jan 17
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Feb 15 – Feb 25
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Sep 6 – Sep 20
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Nov 2 – Nov 12
Maturity window for the second sowing.
Window
Days to maturity
50 – 60 d
Phoenix's 314-day season leaves this much room.
Swiss chard on Phoenix'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
JAN 27
DEC 7

Common questions

When can I sow swiss chard outdoors in Phoenix?

Direct-sow around late December (Dec 27–Jan 17) in Phoenix, based on its local frost dates. Confidence 80%.

When will swiss chard be ready to harvest in Phoenix?

Expect to harvest from around mid February (Feb 15–Feb 25) in Phoenix, based on its local frost dates. Confidence 74%.

When should I start swiss chard seeds indoors in Phoenix?

Start seeds indoors around late December (Dec 30–Jan 20) in Phoenix, based on its local frost dates. Confidence 78%.

When can I transplant swiss chard outdoors in Phoenix?

Transplant outdoors around late December (Dec 27–Jan 17) in Phoenix, based on its local frost dates. Confidence 80%.

Can I plant swiss chard in autumn in Phoenix?

Yes — Phoenix supports a second, autumn sowing of swiss chard around early September (Sep 6–Sep 20), timed to mature before the first fall frost.

How long is the growing season in Phoenix?

Phoenix has roughly 314 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 Phoenix's frost dates.

Confidence 82/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.
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