When to plant radish in Montreal
Radish is cold-hardy, so every date keys off Montreal's frost dates of Apr 19.
Step 1 · Sow
Direct sow outdoors
Apr 20 – May 11
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
May 15 – May 20
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Sep 7 – Sep 21
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Oct 9 – Oct 14
Maturity window for the second sowing.
Window
Days to maturity
25 – 30 d
Montreal's 192-day season leaves this much room.
Radish on Montreal'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 28
Common questions
When can I sow radish outdoors in Montreal?
Direct-sow around mid April (Apr 20–May 11) in Montreal, based on its local frost dates. Confidence 82%.
When will radish be ready to harvest in Montreal?
Expect to harvest from around mid May (May 15–May 20) in Montreal, based on its local frost dates. Confidence 76%.
Can I plant radish in autumn in Montreal?
Yes — Montreal supports a second, autumn sowing of radish around early September (Sep 7–Sep 21), timed to mature before the first fall frost.
How long is the growing season in Montreal?
Montreal has roughly 192 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 Montreal's frost dates.
Confidence 85/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.