When to plant basil in Lyon
Basil is frost-tender, so every date keys off Lyon's last spring frost of Mar 26.
Step 1 · Sow
Start seeds indoors
Mar 10 – Mar 31
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 21 – Jun 11
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 20 – Aug 19
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 90 d
Lyon's 232-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
MAR 26
NOV 16
Common questions
When can I sow basil outdoors in Lyon?
Direct-sow around late May (May 21–Jun 11) in Lyon, based on its local frost dates. Confidence 84%.
When will basil be ready to harvest in Lyon?
Expect to harvest from around mid July (Jul 20–Aug 19) in Lyon, based on its local frost dates. Confidence 78%.
When should I start basil seeds indoors in Lyon?
Start seeds indoors around early March (Mar 10–Mar 31) in Lyon, based on its local frost dates. Confidence 83%.
When can I transplant basil outdoors in Lyon?
Transplant outdoors around late May (May 21–Jun 11) in Lyon, based on its local frost dates. Confidence 84%.
How long is the growing season in Lyon?
Lyon has roughly 232 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 87/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.