When to Plant Edamame in Honolulu, Hawaii (96821)

Location

Honolulu, Hawaii

ZIP Code

96821

USDA Zone

12b

Last Frost

Thursday, January 1, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Thursday, January 15, 2026

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

Pro tip: Sow Edamame directly outdoors 2 weeks after your last frost date — it needs warm soil.

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🌿 Plant Details

Scientific Name Glycine max

Days to Maturity 80 days

Mature Height 18-30"

Spread 6"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

6" apart

🌱

Planting Depth

1" deep

Seeds typically germinate in 6-10 days

Ready to Plant Edamame in Honolulu?

Get your seeds now so they're ready by Thursday, January 15, 2026.

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🤝 Good Companions

CornSquashCarrot

⚠️ Avoid Planting Near

OnionGarlicLeek

🤝

Full Companion Planting Guide for Edamame

See which plants help Edamame thrive, which to keep away, and raised bed layout tips →

🛠️ Supplies You'll Need

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

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🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Let pods mature past the green edamame stage — pods will dry and turn tan on the vine.

Processing

Shell dried pods, cure seeds on a screen for 2 weeks to fully dry.

Seed Viability

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

Pro Tip

Soybeans are self-fertile before flowers open — highly recommended as a beginner seed crop.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 4 per sq ft of Edamame. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Edamame in Honolulu, Hawaii? +

In Honolulu (Zone 12b), direct sow Edamame outdoors around Thursday, January 15, 2026.

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

The average last spring frost date for Honolulu, Hawaii (ZIP 96821) is around Thursday, January 1, 2026. This is based on NOAA climate normals for USDA Zone 12b.

How long does Edamame take to grow? +

Edamame typically matures in about 80 days from direct sowing. In Honolulu, that means you can expect harvest around Thursday, January 15, 2026 plus 80 days.

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

Edamame does best when direct sown outdoors. In Honolulu, sow directly around Thursday, January 15, 2026.

📚 More Edamame Planting Guides

🗺️

Edamame in Hawaii

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 12b Edamame Guide

All cities in your zone · Avg dates

→

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Growing Edamame in Zone 12b

Edamame (Glycine max) is a popular garden vegetable. In Honolulu, Hawaii, which is in USDA Hardiness Zone 12b, you should direct sow seeds around Thursday, January 15, 2026.

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