When to Plant Onion in Zone 1A
USDA Zone
1A
Cities Covered
5
Avg Last Frost
Monday, June 15, 2026
Plant Type
Indoor Start
📅 Planting Calendar for Zone 1A
Start Seeds Indoors Monday, April 20, 2026
Transplant Outdoors Monday, June 29, 2026
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 1A
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Growing Onion in USDA Zone 1A
Onion (Allium cepa) grows well in USDA Hardiness Zone 1A. This zone includes cities like Allakaket, Beaver, Circle and 2 more.
The average last frost date for Zone 1A is around Monday, June 15, 2026. For best results, start your Onion seeds indoors around Monday, April 20, 2026, then transplant outdoors around Monday, June 29, 2026.
Expect to harvest your Onion approximately 100 days after planting.