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When to plant swiss chard in Duluth

Swiss chard is cold-hardy, so every date keys off Duluth's frost dates of May 10.
Step 1 · Sow
Start seeds indoors
Apr 12 – May 3
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 13 – Jun 3
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 2 – Jul 12
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Jul 5 – Jul 19
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Aug 31 – Sep 10
Maturity window for the second sowing.
Window
Days to maturity
50 – 60 d
Duluth's 150-day season leaves this much room.
Swiss chard on Duluth'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
MAY 10
OCT 7

Common questions

When can I sow swiss chard outdoors in Duluth?

Direct-sow around mid May (May 13–Jun 3) in Duluth, based on its local frost dates. Confidence 84%.

When will swiss chard be ready to harvest in Duluth?

Expect to harvest from around early July (Jul 2–Jul 12) in Duluth, based on its local frost dates. Confidence 78%.

When should I start swiss chard seeds indoors in Duluth?

Start seeds indoors around mid April (Apr 12–May 3) in Duluth, based on its local frost dates. Confidence 83%.

When can I transplant swiss chard outdoors in Duluth?

Transplant outdoors around mid May (May 13–Jun 3) in Duluth, based on its local frost dates. Confidence 84%.

Can I plant swiss chard in autumn in Duluth?

Yes — Duluth supports a second, autumn sowing of swiss chard around early July (Jul 5–Jul 19), timed to mature before the first fall frost.

How long is the growing season in Duluth?

Duluth has roughly 150 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 Duluth's frost dates.

Confidence 87/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.
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