When to plant basil in Louisville
Basil is frost-tender, so every date keys off Louisville's last spring frost of Apr 1.
Step 1 · Sow
Start seeds indoors
Mar 13 – Apr 3
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 28 – May 19
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 27 – Jul 27
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 90 d
Louisville's 212-day season leaves this much room.
Basil on Louisville'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 1
OCT 29
Common questions
When can I sow basil outdoors in Louisville?
Direct-sow around late April (Apr 28–May 19) in Louisville, based on its local frost dates. Confidence 80%.
When will basil be ready to harvest in Louisville?
Expect to harvest from around late June (Jun 27–Jul 27) in Louisville, based on its local frost dates. Confidence 74%.
When should I start basil seeds indoors in Louisville?
Start seeds indoors around mid March (Mar 13–Apr 3) in Louisville, based on its local frost dates. Confidence 78%.
When can I transplant basil outdoors in Louisville?
Transplant outdoors around late April (Apr 28–May 19) in Louisville, based on its local frost dates. Confidence 80%.
How long is the growing season in Louisville?
Louisville has roughly 212 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 Louisville's frost dates.
Confidence 82/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.