When to plant garlic in Glasgow
Garlic is cold-hardy, so every date keys off Glasgow's frost dates of May 5.
Step 1 · Sow
Direct sow outdoors
Sep 17 – Oct 8
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
May 14 – May 14
Picking runs until conditions turn against the crop.
Window
Days to maturity
240 d
Glasgow's 163-day season leaves this much room.
Garlic 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 5
OCT 15
Common questions
When can I sow garlic outdoors in Glasgow?
Direct-sow around mid September (Sep 17–Oct 8) in Glasgow, based on its local frost dates. Confidence 70%.
When will garlic be ready to harvest in Glasgow?
Expect to harvest from around mid May (May 14–May 14) in Glasgow, based on its local frost dates. Confidence 63%.
How long is the growing season in Glasgow?
Glasgow has roughly 163 frost-free days, which is marginal time to grow garlic to maturity outdoors.
The rule of thumb
Sow garlic 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 70/100 · NASA POWER (modeled) · 1991–2020 · frost dates are probabilities, not guarantees.