When to plant onions in zone 4b
In zone 4b, the last spring frost usually comes around May 8 and the first fall frost around Sep 28. Here is when to plant onions.
Sow in the bedApr 10
Start pickingJul 19
Your onion (from sets) calendar for zone 4b
- Apr 10: Plant onion sets in the bed
- Jul 19: 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 4b. 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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