When to Plant Radicchio in Honolulu, Hawaii (96821)

Location

Honolulu, Hawaii

ZIP Code

96821

USDA Zone

12b

Last Frost

Thursday, January 1, 2026

📅 Planting Calendar

Start Seeds Indoors Thursday, December 4, 2025

Transplant Outdoors Thursday, December 18, 2025

Pro Tip: Start Radicchio seeds indoors 4 weeks before your last frost date, then transplant outdoors around Thursday, December 18, 2025.

🌿 Plant Details

Scientific Name Cichorium intybus

Days to Maturity 80 days

Mature Height 6-12"

Spread 10"

Type Head

Fruit Size Small-Medium (fist-sized head)

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Regular (keep moist)

↔️

Spacing

10" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 5-10 days

Ready to Plant Radicchio in Honolulu?

Get your seeds now so they're ready by Thursday, December 4, 2025.

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Growing Radicchio in Zone 12b

Radicchio (Cichorium intybus) is a popular garden vegetable. In Honolulu, Hawaii, which is in USDA Hardiness Zone 12b, you should start seeds indoors around Thursday, December 4, 2025.

Your average last frost date is Thursday, January 1, 2026. Plan to transplant your Radicchio seedlings outdoors around Thursday, December 18, 2025, about -2 weeks after your last frost date.