When to plant radish in Boston
Radish is cold-hardy, so every date keys off Boston's frost dates of Apr 4.
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 19 – Oct 3
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Oct 21 – Oct 26
Maturity window for the second sowing.
Window
Days to maturity
25 – 30 d
Boston's 220-day season leaves this much room.
Radish on Boston'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 4
NOV 9
Common questions
When can I sow radish outdoors in Boston?
Direct-sow around early April (Apr 5–Apr 26) in Boston, based on its local frost dates. Confidence 86%.
When will radish be ready to harvest in Boston?
Expect to harvest from around late April (Apr 30–May 5) in Boston, based on its local frost dates. Confidence 80%.
Can I plant radish in autumn in Boston?
Yes — Boston supports a second, autumn sowing of radish around mid September (Sep 19–Oct 3), timed to mature before the first fall frost.
How long is the growing season in Boston?
Boston has roughly 220 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 Boston's frost dates.
Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.