When to Plant Onion in Zone 13A
USDA Zone
13A
Cities Covered
2
Avg Last Frost
Friday, January 1, 2027
Plant Type
Indoor Start
📅 Planting Calendar for Zone 13A
Start Seeds Indoors Friday, November 6, 2026
Transplant Outdoors Friday, January 15, 2027
Pro Tip: Start Onion seeds indoors 8 weeks before your last frost date for best results.
🌿 Plant Details
Scientific Name Allium cepa
Days to Maturity 100 days
Sun Requirements Full Sun (6+ hours)
Plant Spacing 4" apart
Cities in Zone 13A
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Growing Onion in USDA Zone 13A
Onion (Allium cepa) grows well in USDA Hardiness Zone 13A. This zone includes cities like Keauhou, M C B H Kaneohe Bay.
The average last frost date for Zone 13A is around Friday, January 1, 2027. For best results, start your Onion seeds indoors around Friday, November 6, 2026, then transplant outdoors around Friday, January 15, 2027.
Expect to harvest your Onion approximately 100 days after planting.