When to plant onion in Lincoln
Onion is cold-hardy, so every date keys off Lincoln's frost dates of Apr 25.
Step 1 · Sow
Start seeds indoors
Feb 14 – Mar 7
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 16 – May 7
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 15 – Aug 4
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 110 d
Lincoln's 167-day season leaves this much room.
Onion on Lincoln'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 25
OCT 11
Common questions
When will onion be ready to harvest in Lincoln?
Expect to harvest from around mid July (Jul 15–Aug 4) in Lincoln, based on its local frost dates. Confidence 80%.
When should I start onion seeds indoors in Lincoln?
Start seeds indoors around mid February (Feb 14–Mar 7) in Lincoln, based on its local frost dates. Confidence 85%.
When can I transplant onion outdoors in Lincoln?
Transplant outdoors around mid April (Apr 16–May 7) in Lincoln, based on its local frost dates. Confidence 86%.
How long is the growing season in Lincoln?
Lincoln has roughly 167 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 Lincoln's frost dates.
Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.