When to Plant Celosia in Honolulu, Hawaii (96813)

Location

Honolulu, Hawaii

ZIP Code

96813

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 Celosia seeds indoors 6 weeks before your last frost date, then transplant outdoors around Thursday, January 8, 2026.

🌿 Plant Details

Scientific Name Celosia argentea

Days to Maturity 75 days

Mature Height 12-36"

Spread 9"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

9" apart

🌱

Planting Depth

0.125" deep

Seeds typically germinate in 10-14 days

Ready to Plant Celosia in Honolulu?

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

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🤝 Good Companions

MarigoldZinniaBasil

See the full companion planting guide for Celosia →

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Growing Celosia in Zone 12b

Celosia (Celosia argentea) 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 Celosia seedlings outdoors around Thursday, January 8, 2026, about 1 weeks after your last frost date.