When to Plant Fennel in Honolulu, Hawaii (96813)
Location
Honolulu, Hawaii
ZIP Code
96813
USDA Zone
12b
Last Frost
Friday, January 1, 2027
📅 Planting Calendar
Start Seeds Indoors Friday, December 4, 2026
Transplant Outdoors Friday, December 18, 2026
Pro Tip: Start Fennel seeds indoors 4 weeks before your last frost date for best results.
🌿 Plant Details
Scientific Name Foeniculum vulgare
Days to Maturity 80 days
☀️ Growing Requirements
☀️
Sun
Full Sun
💧
Water
Regular
Seeds typically germinate in 7-14 days
🤝 Good Companions
Dill
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Growing Fennel in Zone 12b
Fennel (Foeniculum vulgare) is a popular garden vegetable. In Honolulu, Hawaii, which is in USDA Hardiness Zone 12b, you should start seeds indoors around Friday, December 4, 2026.
Your average last frost date is Friday, January 1, 2027. Plan to transplant your Fennel seedlings outdoors around Friday, December 18, 2026, about -2 weeks after your last frost date.