When to plant cilantro / coriander in Denver
Cilantro / Coriander is cold-hardy, so every date keys off Denver's frost dates of May 4.
Step 1 · Sow
Direct sow outdoors
Apr 20 – May 11
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Jun 4 – Jun 29
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Jun 26 – Jul 10
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Aug 17 – Sep 11
Maturity window for the second sowing.
Window
Days to maturity
45 – 70 d
Denver's 157-day season leaves this much room.
Cilantro / Coriander on Denver'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
MAY 4
OCT 10
Common questions
When can I sow cilantro / coriander outdoors in Denver?
Direct-sow around mid April (Apr 20–May 11) in Denver, based on its local frost dates. Confidence 85%.
When will cilantro / coriander be ready to harvest in Denver?
Expect to harvest from around early June (Jun 4–Jun 29) in Denver, based on its local frost dates. Confidence 76%.
Can I plant cilantro / coriander in autumn in Denver?
Yes — Denver supports a second, autumn sowing of cilantro / coriander around late June (Jun 26–Jul 10), timed to mature before the first fall frost.
How long is the growing season in Denver?
Denver has roughly 157 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 Denver's frost dates.
Confidence 85/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.