When to plant onions in zone 5b
In zone 5b, the last spring frost usually comes around Apr 28 and the first fall frost around Oct 10. Here is when to plant onions.
Sow in the bedMar 31
Start pickingJul 9
Your onion (from sets) calendar for zone 5b
- Mar 31: Plant onion sets in the bed
- Jul 9: 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 5b. 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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