When to plant radish in Louisville
Radish is cold-hardy, so every date keys off Louisville's frost dates of Apr 1.
Step 1 · Sow
Direct sow outdoors
Mar 4 – Mar 25
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Mar 29 – Apr 3
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Sep 8 – Sep 22
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Oct 10 – Oct 15
Maturity window for the second sowing.
Window
Days to maturity
25 – 30 d
Louisville's 212-day season leaves this much room.
Radish on Louisville'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 1
OCT 29
Common questions
When can I sow radish outdoors in Louisville?
Direct-sow around early March (Mar 4–Mar 25) in Louisville, based on its local frost dates. Confidence 82%.
When will radish be ready to harvest in Louisville?
Expect to harvest from around late March (Mar 29–Apr 3) in Louisville, based on its local frost dates. Confidence 74%.
Can I plant radish in autumn in Louisville?
Yes — Louisville supports a second, autumn sowing of radish around early September (Sep 8–Sep 22), timed to mature before the first fall frost.
How long is the growing season in Louisville?
Louisville has roughly 212 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 Louisville's frost dates.
Confidence 82/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.