Growing Onions in Zone 4
When to plant and harvest onions in Zone 4— based on your zone's frost dates.
Zone 4 sits comfortably within onions' best range (Zones 3–9), so it grows well here on a standard schedule.
Onions planting calendar for Zone 4
These months are derived from Zone 4's frost dates — last frost around Early – mid May, first frost around Mid September – mid October.
Start indoors
March
Sow outdoors
—
Transplant
April
Harvest
September
Free planting calendar
Put onions on your own planting calendar
A month-by-month Zone 4 chart with onions already on it — add the rest of your garden, then print it or save it as a PDF.
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Onions care at a glance
- Sunlight
- Full sun
- Water
- 1 inch per week; stop as tops fall
- Spacing
- 4 in apart
- Days to maturity
- 90–120 days
- Best zones
- 3–9 (choose day-length type for your latitude)
Growing onions in Zone 4: FAQs
Can you grow onions in Zone 4?＋
Zone 4 sits comfortably within onions' best range (Zones 3–9), so it grows well here on a standard schedule.
When should I plant onions in Zone 4?＋
In Zone 4, start seeds indoors around March. Zone 4's last spring frost is typically Early – mid May and its first fall frost around Mid September – mid October, which sets the planting window.
When to harvest onions in Zone 4?＋
Expect to harvest onions in Zone 4 around September, depending on the season and variety.
Full Onions guide →
Complete care, problems, companions, and harvest tips.
Zone 4 overview →
Frost dates, climate, and everything to grow here.
July in Zone 4 →
What to sow, transplant, and harvest this month.