When to plant onion in Toulouse
Onion is cold-hardy, so every date keys off Toulouse's frost dates of Apr 5.
Step 1 · Sow
Start seeds indoors
Jan 25 – Feb 15
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Mar 15 – Apr 5
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 13 – Jul 3
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 110 d
Toulouse's 217-day season leaves this much room.
Onion on Toulouse'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 5
NOV 8
Common questions
When will onion be ready to harvest in Toulouse?
Expect to harvest from around mid June (Jun 13–Jul 3) in Toulouse, based on its local frost dates. Confidence 65%.
When should I start onion seeds indoors in Toulouse?
Start seeds indoors around late January (Jan 25–Feb 15) in Toulouse, based on its local frost dates. Confidence 68%.
When can I transplant onion outdoors in Toulouse?
Transplant outdoors around mid March (Mar 15–Apr 5) in Toulouse, based on its local frost dates. Confidence 72%.
How long is the growing season in Toulouse?
Toulouse has roughly 217 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 Toulouse's frost dates.
Confidence 72/100 · NASA POWER (modeled) · 1991–2020 · frost dates are probabilities, not guarantees.