When to Plant Leek in Simi Valley, California (93063)

Location

Simi Valley, California

ZIP Code

93063

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 Simi Valley?

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 Simi Valley, California? +

In Simi Valley (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 Simi Valley, California? +

The average last spring frost date for Simi Valley, California (ZIP 93063) 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 Simi Valley, 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 Simi Valley, 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

→

Other Plants for Simi Valley

Blackberry Blueberry Raspberry Strawberry Basil Chamomile Chives Cilantro Dill Lavender Lemon Balm Marjoram Mint Oregano Parsley Rosemary Sage Tarragon Thyme Acorn Squash Artichoke Arugula Asparagus Beefsteak Tomato Beet Bell Pepper Bok Choy Broccoli Brussels Sprout Butternut Squash Cabbage Cantaloupe Carrot Cauliflower Cayenne Pepper Celery Cherry Tomato Chili Pepper Collard Green Common Bean Cucumber Eggplant Endive Fennel Garlic Grape Tomato Green Bean Habanero Pepper Head Lettuce Heirloom Tomato Honeydew Melon Jalapeño Pepper Kale Kohlrabi Leaf Lettuce Lima Bean Mustard Okra Onion Parsnip Pea Poblano Pepper Pole Pea Potato Pumpkin Radicchio Radish Rhubarb Roma Tomato Rutabaga Serrano Pepper Shallot Snap Pea Snow Pea Spaghetti Squash Spinach Squash Sweet Corn Sweet Potato Swiss Chard Tomato Turnip Watermelon Zucchini Sunflower Marigold Zinnia Nasturtium Cosmos Echinacea (Coneflower) Petunia Black-eyed Susan Apple Tree Pear Tree Peach Tree Plum Tree Sweet Cherry Tree Lemon Tree Borage Lemongrass Ginger Stevia Tomatillo Edamame Fava Bean Mâche Mizuna Sorrel Shishito Pepper Banana Pepper Watermelon Radish Napa Cabbage Popcorn Broccoli Raab Catnip Valerian Lemon Verbena Bee Balm Anise Lovage Chervil Summer Savory Dahlia Snapdragon Pansy Sweet Pea Morning Glory Hollyhock Larkspur Bachelor Button Columbine Impatiens Salvia (Annual) Sweet Alyssum Celosia Lupine Verbena Elderberry Grape Vine Red Currant Gooseberry Serviceberry Fig Tree Avocado Tree Persimmon Tree Olive Tree

Growing Leek in Zone 10a

Leek (Allium ampeloprasum) is a popular garden vegetable. In Simi Valley, 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.