When to plant onion in Reno
Onion is cold-hardy, so every date keys off Reno'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 28 – May 19
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 27 – Aug 16
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 110 d
Reno's 180-day season leaves this much room.
Onion on Reno'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 24
Common questions
When will onion be ready to harvest in Reno?
Expect to harvest from around late July (Jul 27–Aug 16) in Reno, based on its local frost dates. Confidence 75%.
When should I start onion seeds indoors in Reno?
Start seeds indoors around mid February (Feb 14–Mar 7) in Reno, based on its local frost dates. Confidence 79%.
When can I transplant onion outdoors in Reno?
Transplant outdoors around late April (Apr 28–May 19) in Reno, based on its local frost dates. Confidence 81%.
How long is the growing season in Reno?
Reno has roughly 180 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 Reno's frost dates.
Confidence 83/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.