When to plant radish in Charleston
Radish is cold-hardy, so every date keys off Charleston's frost dates of Apr 16.
Step 1 · Sow
Direct sow outdoors
Mar 19 – Apr 9
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Apr 13 – Apr 18
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Aug 31 – Sep 14
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Oct 2 – Oct 7
Maturity window for the second sowing.
Window
Days to maturity
25 – 30 d
Charleston's 186-day season leaves this much room.
Radish on Charleston'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
APR 16
OCT 21
Common questions
When can I sow radish outdoors in Charleston?
Direct-sow around mid March (Mar 19–Apr 9) in Charleston, based on its local frost dates. Confidence 88%.
When will radish be ready to harvest in Charleston?
Expect to harvest from around mid April (Apr 13–Apr 18) in Charleston, based on its local frost dates. Confidence 79%.
Can I plant radish in autumn in Charleston?
Yes — Charleston supports a second, autumn sowing of radish around late August (Aug 31–Sep 14), timed to mature before the first fall frost.
How long is the growing season in Charleston?
Charleston has roughly 186 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 Charleston's frost dates.
Confidence 88/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.