When to Plant Leek in Los Angeles, California (90021)

Location

Los Angeles, California

ZIP Code

90021

USDA Zone

10b

Last Frost

Thursday, January 15, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Thursday, November 6, 2025

Transplant Outdoors

Thursday, January 29, 2026

Based on last frost Thursday, January 15, 2026 · Zone 10b

Pro tip: Start Leek seeds indoors 10 weeks before your last frost date, then transplant outdoors around Thursday, January 29, 2026.

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🌿 Plant Details

Scientific Name Allium ampeloprasum

Days to Maturity 120 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 1-7 days

Ready to Plant Leek in Los Angeles?

Get your seeds now so they're ready by Thursday, November 6, 2025.

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🤝 Good Companions

CeleryAppleCarrot

⚠️ Avoid Planting Near

Swiss Chard

🤝

Full Companion Planting Guide for Leek

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

🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🪵 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 flowering in year 2. Harvest seed heads when seeds are black and ripe.

Processing

Cut seed heads into bags when most seeds are black, dry 1 week, thresh gently.

Seed Viability

Up to 2 years when stored cool, dark, and dry.

Pro Tip

Leeks cross-pollinate with onions via insects. Isolate by at least a mile for truly pure seed.

Frequently Asked Questions

When should I plant Leek in Los Angeles, California? +

In Los Angeles (Zone 10b), start Leek seeds indoors around Thursday, November 6, 2025 and transplant outdoors around Thursday, January 29, 2026.

What is the last frost date for Los Angeles, California? +

The average last spring frost date for Los Angeles, California (ZIP 90021) is around Thursday, January 15, 2026. This is based on NOAA climate normals for USDA Zone 10b.

How long does Leek take to grow? +

Leek typically matures in about 120 days from transplanting. In Los Angeles, that means you can expect harvest around Thursday, January 29, 2026 plus 120 days.

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

Leek should be started indoors 10 weeks before your last frost date. In Los Angeles, that means starting around Thursday, November 6, 2025.

📚 More Leek Planting Guides

🗺️

Leek in California

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 10b Leek Guide

All cities in your zone · Avg dates

→

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Growing Leek in Zone 10b

Leek (Allium ampeloprasum) is a popular garden vegetable. In Los Angeles, California, which is in USDA Hardiness Zone 10b, you should start seeds indoors around Thursday, November 6, 2025.

Your average last frost date is Thursday, January 15, 2026. Plan to transplant your Leek seedlings outdoors around Thursday, January 29, 2026, about 2 weeks after your last frost date.