When to Plant Dahlia in Honolulu, Hawaii (96806)

Location

Honolulu, Hawaii

ZIP Code

96806

USDA Zone

12b

Last Frost

Thursday, January 1, 2026

📅 Planting Calendar

Start Seeds Indoors Thursday, November 20, 2025

Transplant Outdoors Thursday, January 8, 2026

Pro Tip: Start Dahlia seeds indoors 6 weeks before your last frost date, then transplant outdoors around Thursday, January 8, 2026.

🌿 Plant Details

Scientific Name Dahlia pinnata

Days to Maturity 90 days

Mature Height 18-60"

Spread 18"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

18" apart

🌱

Planting Depth

4" deep

Seeds typically germinate in 7-14 days

Ready to Plant Dahlia in Honolulu?

Get your seeds now so they're ready by Thursday, November 20, 2025.

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Growing Dahlia in Zone 12b

Dahlia (Dahlia pinnata) is a popular garden vegetable. In Honolulu, Hawaii, which is in USDA Hardiness Zone 12b, you should start seeds indoors around Thursday, November 20, 2025.

Your average last frost date is Thursday, January 1, 2026. Plan to transplant your Dahlia seedlings outdoors around Thursday, January 8, 2026, about 1 weeks after your last frost date.