When to plant leek in Glasgow
Leek is cold-hardy, so every date keys off Glasgow's frost dates of May 1.
Step 1 · Sow
Start seeds indoors
Feb 20 – Mar 13
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
Jul 26 – Aug 15
Picking runs until conditions turn against the crop.
Window
Days to maturity
100 – 120 d
Glasgow's 183-day season leaves this much room.
Leek 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
FROST
FROST
MAY 1
OCT 27
Common questions
When will leek be ready to harvest in Glasgow?
Expect to harvest from around late July (Jul 26–Aug 15) in Glasgow, based on its local frost dates. Confidence 74%.
When should I start leek seeds indoors in Glasgow?
Start seeds indoors around mid February (Feb 20–Mar 13) in Glasgow, based on its local frost dates. Confidence 78%.
When can I transplant leek outdoors in Glasgow?
Transplant outdoors around mid April (Apr 17–May 8) in Glasgow, based on its local frost dates. Confidence 82%.
How long is the growing season in Glasgow?
Glasgow has roughly 183 frost-free days, which is enough time to grow leek to maturity outdoors.
The rule of thumb
Sow leek 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.