When to Plant Celery in Winnetka, California (91306)

Location

Winnetka, California

ZIP Code

91306

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 Celery seeds indoors 10 weeks before your last frost date, then transplant outdoors around Sunday, February 8, 2026.

🌿 Plant Details

Scientific Name Apium graveolens

Days to Maturity 130 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 8-28 days

Ready to Plant Celery in Winnetka?

Get your seeds now so they're ready by Sunday, November 16, 2025.

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🤝 Good Companions

CosmosDaisySnapDragon

⚠️ Avoid Planting Near

CornAster

🤝

Full Companion Planting Guide for Celery

See which plants help Celery 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

🔴 Difficult

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Celery is biennial — it seeds in year 2. Harvest umbels just before seeds shatter in summer.

Processing

Cut seed heads into bags, dry 2 weeks, thresh to release seeds.

Seed Viability

Up to 3 years when stored cool, dark, and dry.

Pro Tip

In cold climates, dig celery in fall, store roots in a root cellar, and replant in spring for year-2 flowering.

Frequently Asked Questions

When should I plant Celery in Winnetka, California? +

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

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

The average last spring frost date for Winnetka, California (ZIP 91306) is around Sunday, January 25, 2026. This is based on NOAA climate normals for USDA Zone 10a.

How long does Celery take to grow? +

Celery typically matures in about 130 days from transplanting. In Winnetka, that means you can expect harvest around Sunday, February 8, 2026 plus 130 days.

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

Celery should be started indoors 10 weeks before your last frost date. In Winnetka, that means starting around Sunday, November 16, 2025.

📚 More Celery Planting Guides

🗺️

Celery in California

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 10a Celery Guide

All cities in your zone · Avg dates

→

Other Plants for Winnetka

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Growing Celery in Zone 10a

Celery (Apium graveolens) is a popular garden vegetable. In Winnetka, 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 Celery seedlings outdoors around Sunday, February 8, 2026, about 2 weeks after your last frost date.