When to Plant Collard Green in Honolulu, Hawaii (96821)
Location
Honolulu, Hawaii
ZIP Code
96821
USDA Zone
12b
Last Frost
Friday, January 1, 2027
📅 Planting Calendar
Start Seeds Indoors Friday, November 6, 2026
Transplant Outdoors Friday, January 15, 2027
Pro Tip: Start Collard Green seeds indoors 8 weeks before your last frost date for best results.
🌿 Plant Details
Scientific Name Brassica oleracea
Days to Maturity 168 days
☀️ Growing Requirements
☀️
Sun
Full Sun
💧
Water
Regular
Seeds typically germinate in 8-21 days
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Growing Collard Green in Zone 12b
Collard Green (Brassica oleracea) is a popular garden vegetable. In Honolulu, Hawaii, which is in USDA Hardiness Zone 12b, you should start seeds indoors around Friday, November 6, 2026.
Your average last frost date is Friday, January 1, 2027. Plan to transplant your Collard Green seedlings outdoors around Friday, January 15, 2027, about 2 weeks after your last frost date.