When to Plant Rutabaga in Honolulu, Hawaii (96821)

Location

Honolulu, Hawaii

ZIP Code

96821

USDA Zone

12b

Last Frost

Thursday, January 1, 2026

📅 Planting Calendar

Direct Sow Outdoors Thursday, September 25, 2025

Pro Tip: Sow Rutabaga directly outdoors 14 weeks before your last frost date.

🌿 Plant Details

Scientific Name Brassica napus var. napobrassica

Days to Maturity 90 days

Mature Height 18-24"

Spread 8"

Type Root

Fruit Size Medium-Large (3-5 inches)

☀️ Growing Requirements

☀️

Sun

Full Sun (6+ hours)

💧

Water

Regular (1 inch/week)

↔️

Spacing

8" apart

🌱

Planting Depth

0.5" deep

Seeds typically germinate in 4-7 days

Ready to Plant Rutabaga in Honolulu?

Get your seeds now so they're ready by Thursday, September 25, 2025.

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🤝 Good Companions

OnionGarlicPeaBean

⚠️ Avoid Planting Near

TomatoPepper

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Growing Rutabaga in Zone 12b

Rutabaga (Brassica napus var. napobrassica) is a popular garden vegetable. In Honolulu, Hawaii, which is in USDA Hardiness Zone 12b, you should direct sow seeds around Thursday, September 25, 2025.

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