When to plant basil in Lyon
Basil is frost-tender, so every date keys off Lyon's last spring frost of Apr 15.
Step 1 · Sow
Start seeds indoors
Mar 11 – Apr 1
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 22 – May 13
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 21 – Jul 21
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 90 d
Lyon's 193-day season leaves this much room.
Basil 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 can I sow basil outdoors in Lyon?
Direct-sow around late April (Apr 22–May 13) in Lyon, based on its local frost dates. Confidence 86%.
When will basil be ready to harvest in Lyon?
Expect to harvest from around late June (Jun 21–Jul 21) in Lyon, based on its local frost dates. Confidence 77%.
When should I start basil seeds indoors in Lyon?
Start seeds indoors around mid March (Mar 11–Apr 1) in Lyon, based on its local frost dates. Confidence 82%.
When can I transplant basil outdoors in Lyon?
Transplant outdoors around late April (Apr 22–May 13) 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 basil to maturity outdoors.
The rule of thumb
Sow basil 6–8 weeks before your last spring frost; plant out 2–3 weeks after it. 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.