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When to plant onions in zone 10
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Onions in USDA zone 10
| Step | Dates |
|---|---|
| Start seeds indoors | Nov 22 – Dec 6 |
| Transplant outdoors | Jan 3 – Jan 24 |
| Expected first harvest | from Apr 13 |
Average zone 10 frost dates: last spring frost ≈ Jan 31, first fall frost ≈ Dec 15 (318 frost-free days). Local dates can vary by 2-3 weeks.
Plant sets or transplants 2-4 weeks before the last frost; pick long-day varieties in the north, short-day in the south.
FAQ
When to plant onions in zone 10?
Start seeds indoors: Nov 22 – Dec 6; Transplant outdoors: Jan 3 – Jan 24; Expected first harvest: from Apr 13.
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