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When to plant swiss chard in New Haven

Swiss chard is cold-hardy, so every date keys off New Haven's frost dates of Apr 19.
Step 1 · Sow
Start seeds indoors
Mar 22 – Apr 12
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 9 – Apr 30
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
May 29 – Jun 8
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Jul 16 – Jul 30
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Sep 11 – Sep 21
Maturity window for the second sowing.
Window
Days to maturity
50 – 60 d
New Haven's 184-day season leaves this much room.
Swiss chard on New Haven'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 19
OCT 19

Common questions

When can I sow swiss chard outdoors in New Haven?

Direct-sow around early April (Apr 9–Apr 30) in New Haven, based on its local frost dates. Confidence 81%.

When will swiss chard be ready to harvest in New Haven?

Expect to harvest from around late May (May 29–Jun 8) in New Haven, based on its local frost dates. Confidence 75%.

When should I start swiss chard seeds indoors in New Haven?

Start seeds indoors around late March (Mar 22–Apr 12) in New Haven, based on its local frost dates. Confidence 79%.

When can I transplant swiss chard outdoors in New Haven?

Transplant outdoors around early April (Apr 9–Apr 30) in New Haven, based on its local frost dates. Confidence 81%.

Can I plant swiss chard in autumn in New Haven?

Yes — New Haven supports a second, autumn sowing of swiss chard around mid July (Jul 16–Jul 30), timed to mature before the first fall frost.

How long is the growing season in New Haven?

New Haven has roughly 184 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 New Haven'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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