When to Plant Rosemary in Honolulu, Hawaii (96840)

Location

Honolulu, Hawaii

ZIP Code

96840

USDA Zone

12b

Last Frost

Thursday, January 1, 2026

📅 Planting Calendar

Start Seeds Indoors Thursday, October 23, 2025

Transplant Outdoors Thursday, January 15, 2026

Pro Tip: Start Rosemary seeds indoors 10 weeks before your last frost date, then transplant outdoors around Thursday, January 15, 2026.

🌿 Plant Details

Scientific Name Salvia rosmarinus

Days to Maturity 120 days

Mature Height 24-48"

Spread 24"

Type Shrub

Fruit Size N/A

☀️ Growing Requirements

☀️

Sun

Full Sun (6+ hours)

💧

Water

Low (drought tolerant)

↔️

Spacing

24" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 14-21 days

Ready to Plant Rosemary in Honolulu?

Get your seeds now so they're ready by Thursday, October 23, 2025.

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Growing Rosemary in Zone 12b

Rosemary (Salvia rosmarinus) is a popular garden vegetable. In Honolulu, Hawaii, which is in USDA Hardiness Zone 12b, you should start seeds indoors around Thursday, October 23, 2025.

Your average last frost date is Thursday, January 1, 2026. Plan to transplant your Rosemary seedlings outdoors around Thursday, January 15, 2026, about 2 weeks after your last frost date.