When to plant cilantro / coriander in Washington
Cilantro / Coriander is cold-hardy, so every date keys off Washington's frost dates of Mar 24.
Step 1 · Sow
Direct sow outdoors
Mar 12 – Apr 2
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Apr 26 – May 21
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Aug 5 – Aug 19
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Sep 26 – Oct 21
Maturity window for the second sowing.
Window
Days to maturity
45 – 70 d
Washington's 234-day season leaves this much room.
Cilantro / Coriander on Washington'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 24
NOV 17
Common questions
When can I sow cilantro / coriander outdoors in Washington?
Direct-sow around mid March (Mar 12–Apr 2) in Washington, based on its local frost dates. Confidence 86%.
When will cilantro / coriander be ready to harvest in Washington?
Expect to harvest from around late April (Apr 26–May 21) in Washington, based on its local frost dates. Confidence 80%.
Can I plant cilantro / coriander in autumn in Washington?
Yes — Washington supports a second, autumn sowing of cilantro / coriander around early August (Aug 5–Aug 19), timed to mature before the first fall frost.
How long is the growing season in Washington?
Washington 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 Washington's frost dates.
Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.