When to plant cilantro / coriander in Duluth
Cilantro / Coriander is cold-hardy, so every date keys off Duluth's frost dates of May 10.
Step 1 · Sow
Direct sow outdoors
May 13 – Jun 3
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Jun 27 – Jul 22
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Jun 25 – Jul 9
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Aug 16 – Sep 10
Maturity window for the second sowing.
Window
Days to maturity
45 – 70 d
Duluth's 150-day season leaves this much room.
Cilantro / Coriander 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 cilantro / coriander outdoors in Duluth?
Direct-sow around mid May (May 13–Jun 3) in Duluth, based on its local frost dates. Confidence 84%.
When will cilantro / coriander be ready to harvest in Duluth?
Expect to harvest from around late June (Jun 27–Jul 22) in Duluth, based on its local frost dates. Confidence 78%.
Can I plant cilantro / coriander in autumn in Duluth?
Yes — Duluth supports a second, autumn sowing of cilantro / coriander around late June (Jun 25–Jul 9), timed to mature before the first fall frost.
How long is the growing season in Duluth?
Duluth has roughly 150 frost-free days, which is enough time to grow cilantro / coriander to maturity outdoors.
The rule of thumb
Sow cilantro / coriander 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.