When to plant radish in Columbia
Radish is cold-hardy, so every date keys off Columbia's frost dates of Mar 11.
Step 1 · Sow
Direct sow outdoors
Feb 11 – Mar 4
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Mar 8 – Mar 13
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Sep 27 – Oct 11
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Oct 29 – Nov 3
Maturity window for the second sowing.
Window
Days to maturity
25 – 30 d
Columbia's 248-day season leaves this much room.
Radish 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 radish outdoors in Columbia?
Direct-sow around mid February (Feb 11–Mar 4) in Columbia, based on its local frost dates. Confidence 88%.
When will radish be ready to harvest in Columbia?
Expect to harvest from around early March (Mar 8–Mar 13) in Columbia, based on its local frost dates. Confidence 79%.
Can I plant radish in autumn in Columbia?
Yes — Columbia supports a second, autumn sowing of radish around late September (Sep 27–Oct 11), 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 radish to maturity outdoors.
The rule of thumb
Sow radish 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.