When to Plant Onion in Unknown
State
Unknown
Cities Covered
13
USDA Zones
5a, 7a, 7b, 8b, 9a, 9b
Plant Type
Indoor Start
📅 Planting Calendar for Unknown
Based on ZIP 32143 (Zone 9b). Dates may vary by city.
Start Seeds Indoors Wednesday, December 16, 2026
Transplant Outdoors Wednesday, February 24, 2027
Note: Unknown spans multiple zones (5a, 7a, 7b, 8b, 9a, 9b). Select your city below for more precise dates.
🌿 Plant Details
Scientific Name Allium cepa
Days to Maturity 100 days
Sun Requirements Full Sun (6+ hours)
Plant Spacing 4" apart
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Growing Onion in Unknown
Onion (Allium cepa) is a popular garden vegetable in Unknown. The state spans USDA Hardiness Zones 5a, 7a, 7b, 8b, 9a, 9b, so planting dates can vary significantly depending on your location.
For most of Unknown, you should start Onion seeds indoors around Wednesday, December 16, 2026, then transplant outdoors around Wednesday, February 24, 2027.
For the most accurate planting dates, enter your ZIP code on our homepage or select your city from the list above.