When to plant garlic in Portland
Garlic is cold-hardy, so every date keys off Portland's frost dates of Mar 1.
Step 1 · Sow
Direct sow outdoors
Oct 25 – Nov 15
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Jun 22 – Jun 22
Picking runs until conditions turn against the crop.
Window
Days to maturity
240 d
Portland's 266-day season leaves this much room.
Garlic on Portland'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
MAR 1
NOV 22
Common questions
When can I sow garlic outdoors in Portland?
Direct-sow around late October (Oct 25–Nov 15) in Portland, based on its local frost dates. Confidence 88%.
When will garlic be ready to harvest in Portland?
Expect to harvest from around late June (Jun 22–Jun 22) in Portland, based on its local frost dates. Confidence 79%.
How long is the growing season in Portland?
Portland has roughly 266 frost-free days, which is enough 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 Portland's frost dates.
Confidence 88/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.