When to Plant Mustard in Berkeley, California (94708)

Location

Berkeley, California

ZIP Code

94708

USDA Zone

10a

Last Frost

Sunday, January 25, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Sunday, December 14, 2025

Based on last frost Sunday, January 25, 2026 · Zone 10a

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

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🌿 Plant Details

Scientific Name Brassica juncea

Days to Maturity 56 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 1-7 days

Ready to Plant Mustard in Berkeley?

Get your seeds now so they're ready by Sunday, December 14, 2025.

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🤝 Good Companions

CabbageCauliflowerRadishBrussel SproutTurnip

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Full Companion Planting Guide for Mustard

See which plants help Mustard 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

Harvest seed pods just as they turn tan — before they shatter and seeds drop.

Processing

Cut stalks into a bag, thresh to release seeds from pods, winnow lightly.

Seed Viability

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

Pro Tip

Mustard crosses freely within the Brassica family — isolate by 300 feet from other mustard varieties.

Frequently Asked Questions

When should I plant Mustard in Berkeley, California? +

In Berkeley (Zone 10a), direct sow Mustard outdoors around Sunday, December 14, 2025.

What is the last frost date for Berkeley, California? +

The average last spring frost date for Berkeley, California (ZIP 94708) is around Sunday, January 25, 2026. This is based on NOAA climate normals for USDA Zone 10a.

How long does Mustard take to grow? +

Mustard typically matures in about 56 days from direct sowing. In Berkeley, that means you can expect harvest around Sunday, December 14, 2025 plus 56 days.

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

Mustard does best when direct sown outdoors. In Berkeley, sow directly around Sunday, December 14, 2025.

📚 More Mustard Planting Guides

🗺️

Mustard in California

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 10a Mustard Guide

All cities in your zone · Avg dates

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Growing Mustard in Zone 10a

Mustard (Brassica juncea) is a popular garden vegetable. In Berkeley, California, which is in USDA Hardiness Zone 10a, you should direct sow seeds around Sunday, December 14, 2025.

Your average last frost date is Sunday, January 25, 2026. Mustard grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.