When to plant leek in Strasbourg
Leek is cold-hardy, so every date keys off Strasbourg's frost dates of Apr 9.
Step 1 · Sow
Start seeds indoors
Jan 29 – Feb 19
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Mar 26 – Apr 16
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 4 – Jul 24
Picking runs until conditions turn against the crop.
Window
Days to maturity
100 – 120 d
Strasbourg's 206-day season leaves this much room.
Leek on Strasbourg'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 9
OCT 30
Common questions
When will leek be ready to harvest in Strasbourg?
Expect to harvest from around early July (Jul 4–Jul 24) in Strasbourg, based on its local frost dates. Confidence 80%.
When should I start leek seeds indoors in Strasbourg?
Start seeds indoors around late January (Jan 29–Feb 19) in Strasbourg, based on its local frost dates. Confidence 85%.
When can I transplant leek outdoors in Strasbourg?
Transplant outdoors around late March (Mar 26–Apr 16) in Strasbourg, based on its local frost dates. Confidence 89%.
How long is the growing season in Strasbourg?
Strasbourg has roughly 206 frost-free days, which is enough time to grow leek to maturity outdoors.
The rule of thumb
Sow leek 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 Strasbourg's frost dates.
Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.