When to plant garlic in Duluth
Garlic is cold-hardy, so every date keys off Duluth's frost dates of May 10.
Step 1 · Sow
Direct sow outdoors
Sep 9 – Sep 30
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
May 7 – May 7
Picking runs until conditions turn against the crop.
Window
Days to maturity
240 d
Duluth's 150-day season leaves this much room.
Garlic on Duluth'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 10
OCT 7
Common questions
When can I sow garlic outdoors in Duluth?
Direct-sow around early September (Sep 9–Sep 30) in Duluth, based on its local frost dates. Confidence 87%.
When will garlic be ready to harvest in Duluth?
Expect to harvest from around early May (May 7–May 7) in Duluth, based on its local frost dates. Confidence 78%.
How long is the growing season in Duluth?
Duluth has roughly 150 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 Duluth's frost dates.
Confidence 87/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.