When to Plant Turnip in Honolulu, Hawaii (96813)

Location

Honolulu, Hawaii

ZIP Code

96813

USDA Zone

12b

Last Frost

Thursday, January 1, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Thursday, November 20, 2025

Based on last frost Thursday, January 1, 2026 · Zone 12b

Pro tip: Sow Turnip directly outdoors 6 weeks before your last frost date.

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🌿 Plant Details

Scientific Name Brassica rapa

Days to Maturity 91 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 1-7 days

Ready to Plant Turnip in Honolulu?

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

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🛠️ Supplies You'll Need

🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

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🌾 Seed Saving Guide

🟡 Moderate

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Biennial — allow roots to overwinter and harvest seed pods in year 2 when dry.

Processing

Thresh dried stalks, winnow seeds from pod fragments.

Seed Viability

Up to 4 years when stored cool, dark, and dry.

Pro Tip

Brassica rapa — crosses with bok choy, napa cabbage, and other rapa crops. Isolate by 300 feet.

Frequently Asked Questions

When should I plant Turnip in Honolulu, Hawaii? +

In Honolulu (Zone 12b), direct sow Turnip outdoors around Thursday, November 20, 2025.

What is the last frost date for Honolulu, Hawaii? +

The average last spring frost date for Honolulu, Hawaii (ZIP 96813) is around Thursday, January 1, 2026. This is based on NOAA climate normals for USDA Zone 12b.

How long does Turnip take to grow? +

Turnip typically matures in about 91 days from direct sowing. In Honolulu, that means you can expect harvest around Thursday, November 20, 2025 plus 91 days.

Should I start Turnip indoors or direct sow in Hawaii? +

Turnip does best when direct sown outdoors. In Honolulu, sow directly around Thursday, November 20, 2025.

📚 More Turnip Planting Guides

🗺️

Turnip in Hawaii

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 12b Turnip Guide

All cities in your zone · Avg dates

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Growing Turnip in Zone 12b

Turnip (Brassica rapa) is a popular garden vegetable. In Honolulu, Hawaii, which is in USDA Hardiness Zone 12b, you should direct sow seeds around Thursday, November 20, 2025.

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