When to plant cilantro / coriander in Philadelphia
Cilantro / Coriander is cold-hardy, so every date keys off Philadelphia's frost dates of Mar 28.
Step 1 · Sow
Direct sow outdoors
Mar 23 – Apr 13
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
May 7 – Jun 1
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Aug 8 – Aug 22
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Sep 29 – Oct 24
Maturity window for the second sowing.
Window
Days to maturity
45 – 70 d
Philadelphia's 234-day season leaves this much room.
Cilantro / Coriander on Philadelphia'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
MAR 28
NOV 22
Common questions
When can I sow cilantro / coriander outdoors in Philadelphia?
Direct-sow around late March (Mar 23–Apr 13) in Philadelphia, based on its local frost dates. Confidence 84%.
When will cilantro / coriander be ready to harvest in Philadelphia?
Expect to harvest from around early May (May 7–Jun 1) in Philadelphia, based on its local frost dates. Confidence 78%.
Can I plant cilantro / coriander in autumn in Philadelphia?
Yes — Philadelphia supports a second, autumn sowing of cilantro / coriander around early August (Aug 8–Aug 22), timed to mature before the first fall frost.
How long is the growing season in Philadelphia?
Philadelphia has roughly 234 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 Philadelphia's frost dates.
Confidence 87/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.