When to Plant Zinnia in Honolulu, Hawaii (96813)

Location

Honolulu, Hawaii

ZIP Code

96813

USDA Zone

12b

Last Frost

Thursday, January 1, 2026

📅 Planting Calendar

Direct Sow Outdoors Thursday, January 8, 2026

Pro Tip: Sow Zinnia directly outdoors 1 week after your last frost date — it needs warm soil.

🌿 Plant Details

Scientific Name Zinnia elegans

Days to Maturity 60 days

Mature Height 12-36"

Spread 12"

Type Annual

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

12" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 5-10 days

Ready to Plant Zinnia in Honolulu?

Get your seeds now so they're ready by Thursday, January 8, 2026.

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Growing Zinnia in Zone 12b

Zinnia (Zinnia elegans) is a popular garden vegetable. In Honolulu, Hawaii, which is in USDA Hardiness Zone 12b, you should direct sow seeds around Thursday, January 8, 2026.

Your average last frost date is Thursday, January 1, 2026. Zinnia grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.