When to plant spinach in Columbia
Spinach is cold-hardy, so every date keys off Columbia's frost dates of Mar 11.
Step 1 · Sow
Direct sow outdoors
Jan 28 – Feb 18
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Mar 9 – Mar 19
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Sep 7 – Sep 21
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Oct 24 – Nov 3
Maturity window for the second sowing.
Window
Days to maturity
40 – 50 d
Columbia's 248-day season leaves this much room.
Spinach on Columbia'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 11
NOV 17
Common questions
When can I sow spinach outdoors in Columbia?
Direct-sow around late January (Jan 28–Feb 18) in Columbia, based on its local frost dates. Confidence 88%.
When will spinach be ready to harvest in Columbia?
Expect to harvest from around early March (Mar 9–Mar 19) in Columbia, based on its local frost dates. Confidence 79%.
Can I plant spinach in autumn in Columbia?
Yes — Columbia supports a second, autumn sowing of spinach around early September (Sep 7–Sep 21), timed to mature before the first fall frost.
How long is the growing season in Columbia?
Columbia has roughly 248 frost-free days, which is enough time to grow spinach to maturity outdoors.
The rule of thumb
Sow spinach 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 Columbia's frost dates.
Confidence 88/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.