When to plant onions in zone 4a
In zone 4a, the last spring frost usually comes around May 12 and the first fall frost around Sep 21. Here is when to plant onions.
Sow in the bedApr 14
Start pickingJul 23
Your onion (from sets) calendar for zone 4a
- Apr 14: Plant onion sets in the bed
- Jul 23: 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 4a. Your local frost dates may be a week or two different. If a late cold snap is forecast, wait a few days.
Plan your raised bed in 3D. Pick your bed size and material, choose your plants, and get a printable plan with measurements, a shopping list and planting dates for your ZIP code. Free, no sign-up.
Open the free planner →