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When to plant swiss chard in Columbia

Swiss chard is cold-hardy, so every date keys off Columbia's frost dates of Mar 11.
Step 1 · Sow
Start seeds indoors
Feb 11 – Mar 4
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Feb 25 – Mar 18
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Apr 16 – Apr 26
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Aug 15 – Aug 29
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Oct 11 – Oct 21
Maturity window for the second sowing.
Window
Days to maturity
50 – 60 d
Columbia's 248-day season leaves this much room.
Swiss chard on Columbia'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
MAR 11
NOV 17

Common questions

When can I sow swiss chard outdoors in Columbia?

Direct-sow around late February (Feb 25–Mar 18) in Columbia, based on its local frost dates. Confidence 88%.

When will swiss chard be ready to harvest in Columbia?

Expect to harvest from around mid April (Apr 16–Apr 26) in Columbia, based on its local frost dates. Confidence 79%.

When should I start swiss chard seeds indoors in Columbia?

Start seeds indoors around mid February (Feb 11–Mar 4) in Columbia, based on its local frost dates. Confidence 84%.

When can I transplant swiss chard outdoors in Columbia?

Transplant outdoors around late February (Feb 25–Mar 18) in Columbia, based on its local frost dates. Confidence 88%.

Can I plant swiss chard in autumn in Columbia?

Yes — Columbia supports a second, autumn sowing of swiss chard around mid August (Aug 15–Aug 29), timed to mature before the first fall frost.

How long is the growing season in Columbia?

Columbia has roughly 248 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 Columbia'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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