When to plant spinach in Irvine
Spinach is cold-hardy, so every date keys off Irvine's frost dates.
Step 1 · Sow
Direct sow outdoors
Jan 1 – Jan 22
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Feb 10 – Feb 20
Picking runs until conditions turn against the crop.
Window
Days to maturity
40 – 50 d
From sowing to first pick.
Common questions
When can I sow spinach outdoors in Irvine?
Direct-sow around early January (Jan 1–Jan 22) in Irvine, based on its local frost dates. Confidence 77%.
When will spinach be ready to harvest in Irvine?
Expect to harvest from around early February (Feb 10–Feb 20) in Irvine, based on its local frost dates. Confidence 71%.
How long is the growing season in Irvine?
Irvine has roughly 365 frost-free days, which is enough time to grow spinach to maturity outdoors.
The rule of thumb
Sow spinach 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 Irvine's frost dates.
Confidence 79/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.