When to plant cauliflower in Duluth
Cauliflower is cold-hardy, so every date keys off Duluth's frost dates of May 10.
Step 1 · Sow
Start seeds indoors
Mar 29 – Apr 19
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 13 – Jun 3
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 12 – Aug 6
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 85 d
Duluth's 150-day season leaves this much room.
Cauliflower 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 will cauliflower be ready to harvest in Duluth?
Expect to harvest from around mid July (Jul 12–Aug 6) in Duluth, based on its local frost dates. Confidence 78%.
When should I start cauliflower seeds indoors in Duluth?
Start seeds indoors around late March (Mar 29–Apr 19) in Duluth, based on its local frost dates. Confidence 83%.
When can I transplant cauliflower outdoors in Duluth?
Transplant outdoors around mid May (May 13–Jun 3) in Duluth, based on its local frost dates. Confidence 84%.
How long is the growing season in Duluth?
Duluth has roughly 150 frost-free days, which is enough time to grow cauliflower to maturity outdoors.
The rule of thumb
Sow cauliflower 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.