When to plant radish in Cologne
Radish is cold-hardy, so every date keys off Cologne's frost dates of Mar 26.
Step 1 · Sow
Direct sow outdoors
Feb 26 – Mar 19
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Mar 23 – Mar 28
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
Cologne's 238-day season leaves this much room.
Radish on Cologne'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 26
NOV 17
Common questions
When can I sow radish outdoors in Cologne?
Direct-sow around late February (Feb 26–Mar 19) in Cologne, based on its local frost dates. Confidence 89%.
When will radish be ready to harvest in Cologne?
Expect to harvest from around late March (Mar 23–Mar 28) in Cologne, based on its local frost dates. Confidence 80%.
Can I plant radish in autumn in Cologne?
Yes — Cologne 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 Cologne?
Cologne has roughly 238 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 Cologne's frost dates.
Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.