When to plant onions in zone 9b
In zone 9b, the last spring frost usually comes around Feb 15 and the first fall frost around Dec 10. Here is when to plant onions.
Sow in the bedJan 18
Start pickingApr 28
Your onion (from sets) calendar for zone 9b
- Jan 18: Plant onion sets in the bed
- Apr 28: Start picking onions
Plant small bulbs ("sets") pointy end up. Harvest when the tops fall over.
Spacing in a raised bed: 9 plants per square foot.
These dates are estimates from the average frost dates for zone 9b. Your local frost dates may be a week or two different. If a late cold snap is forecast, wait a few days.
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