When to plant radish in New Haven
Radish is cold-hardy, so every date keys off New Haven's frost dates of Apr 19.
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
Aug 29 – Sep 12
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Sep 30 – Oct 5
Maturity window for the second sowing.
Window
Days to maturity
25 – 30 d
New Haven's 184-day season leaves this much room.
Radish on New Haven'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 19
OCT 19
Common questions
When can I sow radish outdoors in New Haven?
Direct-sow around early April (Apr 5–Apr 26) in New Haven, based on its local frost dates. Confidence 81%.
When will radish be ready to harvest in New Haven?
Expect to harvest from around late April (Apr 30–May 5) in New Haven, based on its local frost dates. Confidence 75%.
Can I plant radish in autumn in New Haven?
Yes — New Haven supports a second, autumn sowing of radish around late August (Aug 29–Sep 12), timed to mature before the first fall frost.
How long is the growing season in New Haven?
New Haven has roughly 184 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 New Haven's frost dates.
Confidence 83/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.