When to plant onion in Los Angeles
Onion is cold-hardy, so every date keys off Los Angeles's frost dates.
Step 1 · Sow
Direct sow outdoors
Dec 27 – Jan 17
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Mar 27 – Apr 16
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 110 d
From sowing to first pick.
Common questions
When can I sow onion outdoors in Los Angeles?
Direct-sow around late December (Dec 27–Jan 17) in Los Angeles, based on its local frost dates. Confidence 78%.
When will onion be ready to harvest in Los Angeles?
Expect to harvest from around late March (Mar 27–Apr 16) in Los Angeles, based on its local frost dates. Confidence 72%.
How long is the growing season in Los Angeles?
Los Angeles has roughly 365 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 Los Angeles's frost dates.
Confidence 80/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.