When to plant radish in Madison
Radish is cold-hardy, so every date keys off Madison's frost dates of May 5.
Step 1 · Sow
Direct sow outdoors
Apr 10 – May 1
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
May 5 – May 10
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Aug 16 – Aug 30
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Sep 17 – Sep 22
Maturity window for the second sowing.
Window
Days to maturity
25 – 30 d
Madison's 151-day season leaves this much room.
Radish on Madison'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 5
OCT 6
Common questions
When can I sow radish outdoors in Madison?
Direct-sow around early April (Apr 10–May 1) in Madison, based on its local frost dates. Confidence 86%.
When will radish be ready to harvest in Madison?
Expect to harvest from around early May (May 5–May 10) in Madison, based on its local frost dates. Confidence 80%.
Can I plant radish in autumn in Madison?
Yes — Madison supports a second, autumn sowing of radish around mid August (Aug 16–Aug 30), timed to mature before the first fall frost.
How long is the growing season in Madison?
Madison has roughly 151 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 Madison's frost dates.
Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.