When to plant kale in Glasgow

Kale is cold-hardy, so every date keys off Glasgow's frost dates of May 1.
Step 1 · Sow
Start seeds indoors
Mar 20 – Apr 10
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 10 – May 1
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 4 – Jun 24
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Jul 23 – Aug 6
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Sep 23 – Oct 13
Maturity window for the second sowing.
Window
Days to maturity
55 – 75 d
Glasgow's 183-day season leaves this much room.
Kale 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 kale outdoors in Glasgow?

Direct-sow around early April (Apr 10–May 1) in Glasgow, based on its local frost dates. Confidence 82%.

When will kale be ready to harvest in Glasgow?

Expect to harvest from around early June (Jun 4–Jun 24) in Glasgow, based on its local frost dates. Confidence 74%.

When should I start kale seeds indoors in Glasgow?

Start seeds indoors around mid March (Mar 20–Apr 10) in Glasgow, based on its local frost dates. Confidence 78%.

When can I transplant kale outdoors in Glasgow?

Transplant outdoors around early April (Apr 10–May 1) in Glasgow, based on its local frost dates. Confidence 82%.

Can I plant kale in autumn in Glasgow?

Yes — Glasgow supports a second, autumn sowing of kale around late July (Jul 23–Aug 6), 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 kale to maturity outdoors.

The rule of thumb

Sow kale 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.