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When to plant swiss chard in Glasgow

Swiss chard is cold-hardy, so every date keys off Glasgow's frost dates of May 1.
Step 1 · Sow
Start seeds indoors
Apr 3 – Apr 24
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 17 – May 8
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 6 – Jun 16
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Jul 14 – Jul 28
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Sep 9 – Sep 19
Maturity window for the second sowing.
Window
Days to maturity
50 – 60 d
Glasgow's 183-day season leaves this much room.
Swiss chard on Glasgow'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 1
OCT 27

Common questions

When can I sow swiss chard outdoors in Glasgow?

Direct-sow around mid April (Apr 17–May 8) in Glasgow, based on its local frost dates. Confidence 82%.

When will swiss chard be ready to harvest in Glasgow?

Expect to harvest from around early June (Jun 6–Jun 16) in Glasgow, based on its local frost dates. Confidence 74%.

When should I start swiss chard seeds indoors in Glasgow?

Start seeds indoors around early April (Apr 3–Apr 24) in Glasgow, based on its local frost dates. Confidence 78%.

When can I transplant swiss chard outdoors in Glasgow?

Transplant outdoors around mid April (Apr 17–May 8) in Glasgow, based on its local frost dates. Confidence 82%.

Can I plant swiss chard in autumn in Glasgow?

Yes — Glasgow supports a second, autumn sowing of swiss chard around mid July (Jul 14–Jul 28), timed to mature before the first fall frost.

How long is the growing season in Glasgow?

Glasgow has roughly 183 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 Glasgow'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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