When to plant onions in zone 3b
In zone 3b, the last spring frost usually comes around May 15 and the first fall frost around Sep 15. Here is when to plant onions.
Sow in the bedApr 17
Start pickingJul 26
Your onion (from sets) calendar for zone 3b
- Apr 17: Plant onion sets in the bed
- Jul 26: 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 3b. 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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