When to plant cauliflower in Halifax
Cauliflower is cold-hardy, so every date keys off Halifax's frost dates of May 13.
Step 1 · Sow
Start seeds indoors
Apr 1 – Apr 22
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 12 – Jun 2
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 11 – Aug 5
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Jun 22 – Jul 6
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Aug 28 – Sep 22
Maturity window for the second sowing.
Window
Days to maturity
60 – 85 d
Halifax's 158-day season leaves this much room.
Cauliflower on Halifax'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 13
OCT 20
Common questions
When will cauliflower be ready to harvest in Halifax?
Expect to harvest from around mid July (Jul 11–Aug 5) in Halifax, based on its local frost dates. Confidence 70%.
When should I start cauliflower seeds indoors in Halifax?
Start seeds indoors around early April (Apr 1–Apr 22) in Halifax, based on its local frost dates. Confidence 74%.
When can I transplant cauliflower outdoors in Halifax?
Transplant outdoors around mid May (May 12–Jun 2) in Halifax, based on its local frost dates. Confidence 76%.
Can I plant cauliflower in autumn in Halifax?
Yes — Halifax supports a second, autumn sowing of cauliflower around late June (Jun 22–Jul 6), timed to mature before the first fall frost.
How long is the growing season in Halifax?
Halifax has roughly 158 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 Halifax's frost dates.
Confidence 78/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.