Growing Onions in Zone 12
When to plant and harvest onions in Zone 12— based on your zone's frost dates.
Zone 12 runs warmer than onions' usual range (Zones 3–9). Heat can cut the season short, so focus on the cooler shoulder months.
Onions planting calendar for Zone 12
These months are derived from Zone 12's frost dates — last frost around None, first frost around None.
Start indoors
November
Sow outdoors
—
Transplant
December
Harvest
May
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 12: FAQs
Can you grow onions in Zone 12?＋
Zone 12 runs warmer than onions' usual range (Zones 3–9). Heat can cut the season short, so focus on the cooler shoulder months.
When should I plant onions in Zone 12?＋
In Zone 12, start seeds indoors around November. Zone 12's last spring frost is typically None and its first fall frost around None, which sets the planting window.
When to harvest onions in Zone 12?＋
Expect to harvest onions in Zone 12 around May, depending on the season and variety.
Full Onions guide →
Complete care, problems, companions, and harvest tips.
Zone 12 overview →
Frost dates, climate, and everything to grow here.
June in Zone 12 →
What to sow, transplant, and harvest this month.