When to plant onion in Baton Rouge
Onion is cold-hardy, so every date keys off Baton Rouge's frost dates of Feb 17.
Step 1 · Sow
Start seeds indoors
Dec 9 – Dec 30
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Jan 27 – Feb 17
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Apr 27 – May 17
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 110 d
Baton Rouge's 278-day season leaves this much room.
Onion on Baton Rouge'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
FEB 17
NOV 24
Common questions
When will onion be ready to harvest in Baton Rouge?
Expect to harvest from around late April (Apr 27–May 17) in Baton Rouge, based on its local frost dates. Confidence 79%.
When should I start onion seeds indoors in Baton Rouge?
Start seeds indoors around early December (Dec 9–Dec 30) in Baton Rouge, based on its local frost dates. Confidence 84%.
When can I transplant onion outdoors in Baton Rouge?
Transplant outdoors around late January (Jan 27–Feb 17) in Baton Rouge, based on its local frost dates. Confidence 88%.
How long is the growing season in Baton Rouge?
Baton Rouge has roughly 278 frost-free days, which is enough time to grow onion to maturity outdoors.
The rule of thumb
Sow onion 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 Baton Rouge's frost dates.
Confidence 88/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.