When to plant cilantro / coriander in St. Louis
Cilantro / Coriander is cold-hardy, so every date keys off St. Louis's frost dates of Mar 30.
Step 1 · Sow
Direct sow outdoors
Mar 17 – Apr 7
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
May 1 – May 26
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Jul 27 – Aug 10
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Sep 17 – Oct 12
Maturity window for the second sowing.
Window
Days to maturity
45 – 70 d
St. Louis's 218-day season leaves this much room.
Cilantro / Coriander on St. Louis'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 30
NOV 5
Common questions
When can I sow cilantro / coriander outdoors in St. Louis?
Direct-sow around mid March (Mar 17–Apr 7) in St. Louis, based on its local frost dates. Confidence 81%.
When will cilantro / coriander be ready to harvest in St. Louis?
Expect to harvest from around early May (May 1–May 26) in St. Louis, based on its local frost dates. Confidence 76%.
Can I plant cilantro / coriander in autumn in St. Louis?
Yes — St. Louis supports a second, autumn sowing of cilantro / coriander around late July (Jul 27–Aug 10), timed to mature before the first fall frost.
How long is the growing season in St. Louis?
St. Louis has roughly 218 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 St. Louis's frost dates.
Confidence 84/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.