When to plant cabbage in San Bernardino

Cabbage 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
Mar 6 – Apr 5
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Aug 10 – Aug 24
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Oct 26 – Nov 25
Maturity window for the second sowing.
Window
Days to maturity
70 – 100 d
San Bernardino's 284-day season leaves this much room.
Cabbage 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 cabbage be ready to harvest in San Bernardino?

Expect to harvest from around early March (Mar 6–Apr 5) in San Bernardino, based on its local frost dates. Confidence 70%.

When should I start cabbage 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 cabbage 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 cabbage in autumn in San Bernardino?

Yes — San Bernardino supports a second, autumn sowing of cabbage around early August (Aug 10–Aug 24), 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 cabbage to maturity outdoors.

The rule of thumb

Sow cabbage 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.