Growing Onions in Zone 3
When to plant and harvest onions in Zone 3— based on your zone's frost dates.
Zone 3 sits comfortably within onions' best range (Zones 3–9), so it grows well here on a standard schedule.
Onions planting calendar for Zone 3
These months are derived from Zone 3's frost dates — last frost around Mid May – early June, first frost around Early September – early October.
Start indoors
January
Sow outdoors
—
Transplant
April
Harvest
—
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 3: FAQs
Can you grow onions in Zone 3?＋
Zone 3 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 3?＋
In Zone 3, start seeds indoors around January. Zone 3's last spring frost is typically Mid May – early June and its first fall frost around Early September – early October, which sets the planting window.
When to harvest onions in Zone 3?＋
Harvest timing depends on your planting date and variety — onions typically matures in 90–120 days. See the full guide for harvest cues.
Full Onions guide →
Complete care, problems, companions, and harvest tips.
Zone 3 overview →
Frost dates, climate, and everything to grow here.
June in Zone 3 →
What to sow, transplant, and harvest this month.