When to Plant Edamame in Mount Wilson, California (91023)

Location

Mount Wilson, California

ZIP Code

91023

USDA Zone

Last Frost

Friday, February 20, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Friday, March 6, 2026

Based on last frost Friday, February 20, 2026 · Zone 9a

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 Mount Wilson?

Get your seeds now so they're ready by Friday, March 6, 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 Mount Wilson, California? +

In Mount Wilson (Zone 9a), direct sow Edamame outdoors around Friday, March 6, 2026.

What is the last frost date for Mount Wilson, California? +

The average last spring frost date for Mount Wilson, California (ZIP 91023) is around Friday, February 20, 2026. This is based on NOAA climate normals for USDA Zone 9a.

How long does Edamame take to grow? +

Edamame typically matures in about 80 days from direct sowing. In Mount Wilson, that means you can expect harvest around Friday, March 6, 2026 plus 80 days.

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

Edamame does best when direct sown outdoors. In Mount Wilson, sow directly around Friday, March 6, 2026.

📚 More Edamame Planting Guides

🗺️

Edamame in California

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 9a Edamame Guide

All cities in your zone · Avg dates

→

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Growing Edamame in Zone 9a

Edamame (Glycine max) is a popular garden vegetable. In Mount Wilson, California, which is in USDA Hardiness Zone 9a, you should direct sow seeds around Friday, March 6, 2026.

Your average last frost date is Friday, February 20, 2026. Edamame grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.