When to plant leek in Lyon
Leek is cold-hardy, so every date keys off Lyon's frost dates of Apr 15.
Step 1 · Sow
Start seeds indoors
Feb 4 – Feb 25
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 1 – Apr 22
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 10 – Jul 30
Picking runs until conditions turn against the crop.
Window
Days to maturity
100 – 120 d
Lyon's 193-day season leaves this much room.
Leek on Lyon'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 15
OCT 25
Common questions
When will leek be ready to harvest in Lyon?
Expect to harvest from around early July (Jul 10–Jul 30) in Lyon, based on its local frost dates. Confidence 77%.
When should I start leek seeds indoors in Lyon?
Start seeds indoors around early February (Feb 4–Feb 25) in Lyon, based on its local frost dates. Confidence 82%.
When can I transplant leek outdoors in Lyon?
Transplant outdoors around early April (Apr 1–Apr 22) in Lyon, based on its local frost dates. Confidence 86%.
How long is the growing season in Lyon?
Lyon has roughly 193 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 Lyon's frost dates.
Confidence 86/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.