When to plant cilantro / coriander in San Bernardino
Cilantro / Coriander is cold-hardy, so every date keys off San Bernardino's frost dates of Feb 23.
Step 1 · Sow
Direct sow outdoors
Dec 26 – Jan 16
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Feb 9 – Mar 6
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Aug 26 – Sep 9
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Oct 17 – Nov 11
Maturity window for the second sowing.
Window
Days to maturity
45 – 70 d
San Bernardino's 284-day season leaves this much room.
Cilantro / Coriander 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
FROST
FEB 23
DEC 9
Common questions
When can I sow cilantro / coriander outdoors in San Bernardino?
Direct-sow around late December (Dec 26–Jan 16) in San Bernardino, based on its local frost dates. Confidence 76%.
When will cilantro / coriander be ready to harvest in San Bernardino?
Expect to harvest from around early February (Feb 9–Mar 6) in San Bernardino, based on its local frost dates. Confidence 70%.
Can I plant cilantro / coriander in autumn in San Bernardino?
Yes — San Bernardino supports a second, autumn sowing of cilantro / coriander around late August (Aug 26–Sep 9), 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 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 San Bernardino's frost dates.
Confidence 78/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.