When to plant cauliflower in San Bernardino

Cauliflower is cold-hardy, so every date keys off San Bernardino's frost dates of Feb 23.
Step 1 · Sow
Start seeds indoors
Jan 12 – Feb 2
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Dec 26 – Jan 16
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Feb 24 – Mar 21
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Aug 11 – Aug 25
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Oct 17 – Nov 11
Maturity window for the second sowing.
Window
Days to maturity
60 – 85 d
San Bernardino's 284-day season leaves this much room.
Cauliflower on San Bernardino'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
FEB 23
DEC 9

Common questions

When will cauliflower be ready to harvest in San Bernardino?

Expect to harvest from around late February (Feb 24–Mar 21) in San Bernardino, based on its local frost dates. Confidence 70%.

When should I start cauliflower seeds indoors in San Bernardino?

Start seeds indoors around mid January (Jan 12–Feb 2) in San Bernardino, based on its local frost dates. Confidence 74%.

When can I transplant cauliflower outdoors in San Bernardino?

Transplant outdoors around late December (Dec 26–Jan 16) in San Bernardino, based on its local frost dates. Confidence 76%.

Can I plant cauliflower in autumn in San Bernardino?

Yes — San Bernardino supports a second, autumn sowing of cauliflower around mid August (Aug 11–Aug 25), timed to mature before the first fall frost.

How long is the growing season in San Bernardino?

San Bernardino has roughly 284 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 San Bernardino's frost dates.

Confidence 78/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.