When to plant onion in Jackson
Onion is cold-hardy, so every date keys off Jackson's frost dates of Mar 3.
Step 1 · Sow
Start seeds indoors
Dec 23 – Jan 13
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Feb 10 – Mar 3
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
May 11 – May 31
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 110 d
Jackson's 267-day season leaves this much room.
Onion on Jackson'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 3
NOV 20
Common questions
When will onion be ready to harvest in Jackson?
Expect to harvest from around mid May (May 11–May 31) in Jackson, based on its local frost dates. Confidence 74%.
When should I start onion seeds indoors in Jackson?
Start seeds indoors around late December (Dec 23–Jan 13) in Jackson, based on its local frost dates. Confidence 78%.
When can I transplant onion outdoors in Jackson?
Transplant outdoors around early February (Feb 10–Mar 3) in Jackson, based on its local frost dates. Confidence 82%.
How long is the growing season in Jackson?
Jackson has roughly 267 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 Jackson's frost dates.
Confidence 82/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.