When to Plant Leek in Newhall, California (91321)

Location

Newhall, California

ZIP Code

91321

USDA Zone

10a

Last Frost

Sunday, January 25, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Sunday, November 16, 2025

Transplant Outdoors

Sunday, February 8, 2026

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

Pro tip: Start Leek seeds indoors 10 weeks before your last frost date, then transplant outdoors around Sunday, February 8, 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 Newhall?

Get your seeds now so they're ready by Sunday, November 16, 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 Newhall, California? +

In Newhall (Zone 10a), start Leek seeds indoors around Sunday, November 16, 2025 and transplant outdoors around Sunday, February 8, 2026.

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

The average last spring frost date for Newhall, California (ZIP 91321) is around Sunday, January 25, 2026. This is based on NOAA climate normals for USDA Zone 10a.

How long does Leek take to grow? +

Leek typically matures in about 120 days from transplanting. In Newhall, that means you can expect harvest around Sunday, February 8, 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 Newhall, that means starting around Sunday, November 16, 2025.

📚 More Leek Planting Guides

🗺️

Leek in California

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 10a Leek Guide

All cities in your zone · Avg dates

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Growing Leek in Zone 10a

Leek (Allium ampeloprasum) is a popular garden vegetable. In Newhall, California, which is in USDA Hardiness Zone 10a, you should start seeds indoors around Sunday, November 16, 2025.

Your average last frost date is Sunday, January 25, 2026. Plan to transplant your Leek seedlings outdoors around Sunday, February 8, 2026, about 2 weeks after your last frost date.