When to plant radish in Detroit
Radish is cold-hardy, so every date keys off Detroit's frost dates of Apr 15.
Step 1 · Sow
Direct sow outdoors
Apr 5 – Apr 26
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Apr 30 – May 5
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Sep 10 – Sep 24
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Oct 12 – Oct 17
Maturity window for the second sowing.
Window
Days to maturity
25 – 30 d
Detroit's 194-day season leaves this much room.
Radish on Detroit'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 15
OCT 31
Common questions
When can I sow radish outdoors in Detroit?
Direct-sow around early April (Apr 5–Apr 26) in Detroit, based on its local frost dates. Confidence 85%.
When will radish be ready to harvest in Detroit?
Expect to harvest from around late April (Apr 30–May 5) in Detroit, based on its local frost dates. Confidence 79%.
Can I plant radish in autumn in Detroit?
Yes — Detroit supports a second, autumn sowing of radish around early September (Sep 10–Sep 24), timed to mature before the first fall frost.
How long is the growing season in Detroit?
Detroit has roughly 194 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 Detroit's frost dates.
Confidence 88/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.