When to plant onion in North Las Vegas
Onion is cold-hardy, so every date keys off North Las Vegas's frost dates of Feb 4.
Step 1 · Sow
Start seeds indoors
Nov 26 – Dec 17
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Jan 29 – Feb 19
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Apr 29 – May 19
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 110 d
North Las Vegas's 305-day season leaves this much room.
Onion on North Las Vegas'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
FEB 4
DEC 5
Common questions
When will onion be ready to harvest in North Las Vegas?
Expect to harvest from around late April (Apr 29–May 19) in North Las Vegas, based on its local frost dates. Confidence 76%.
When should I start onion seeds indoors in North Las Vegas?
Start seeds indoors around late November (Nov 26–Dec 17) in North Las Vegas, based on its local frost dates. Confidence 81%.
When can I transplant onion outdoors in North Las Vegas?
Transplant outdoors around late January (Jan 29–Feb 19) in North Las Vegas, based on its local frost dates. Confidence 82%.
How long is the growing season in North Las Vegas?
North Las Vegas has roughly 305 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 North Las Vegas's frost dates.
Confidence 85/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.