When to plant onion in Winston-Salem
Onion is cold-hardy, so every date keys off Winston-Salem's frost dates of Mar 29.
Step 1 · Sow
Start seeds indoors
Jan 18 – Feb 8
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Mar 19 – Apr 9
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 17 – Jul 7
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 110 d
Winston-Salem's 219-day season leaves this much room.
Onion on Winston-Salem'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 29
NOV 5
Common questions
When will onion be ready to harvest in Winston-Salem?
Expect to harvest from around mid June (Jun 17–Jul 7) in Winston-Salem, based on its local frost dates. Confidence 75%.
When should I start onion seeds indoors in Winston-Salem?
Start seeds indoors around mid January (Jan 18–Feb 8) in Winston-Salem, based on its local frost dates. Confidence 79%.
When can I transplant onion outdoors in Winston-Salem?
Transplant outdoors around mid March (Mar 19–Apr 9) in Winston-Salem, based on its local frost dates. Confidence 81%.
How long is the growing season in Winston-Salem?
Winston-Salem has roughly 219 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 Winston-Salem's frost dates.
Confidence 83/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.