When to Plant Dahlia in Berkeley, California (94708)

Location

Berkeley, California

ZIP Code

94708

USDA Zone

10a

Last Frost

Sunday, January 25, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Sunday, December 14, 2025

Transplant Outdoors

Sunday, February 1, 2026

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

Pro tip: Start Dahlia seeds indoors 6 weeks before your last frost date, then transplant outdoors around Sunday, February 1, 2026.

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🌿 Plant Details

Scientific Name Dahlia pinnata

Days to Maturity 90 days

Mature Height 18-60"

Spread 18"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

18" apart

🌱

Planting Depth

4" deep

Seeds typically germinate in 7-14 days

Ready to Plant Dahlia in Berkeley?

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

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🤝 Good Companions

MarigoldBasilCosmos

🤝

Full Companion Planting Guide for Dahlia

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

🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🌍 Flower Garden Soil ✂️ Pruning Shears 🚿 Watering Can

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🌾 Seed Saving Guide

🟡 Moderate

⚠️ Many varieties are F1 hybrid — look for OP/heirloom types

When to Harvest Seed

Allow seed pods (behind the flower) to dry on the plant in fall.

Processing

Remove dried seed pods, extract flat seeds, dry 1 week in an open envelope.

Seed Viability

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

Pro Tip

Dahlia seeds do not grow true to the parent — each seedling is a unique hybrid. Propagate named varieties by tuber division.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 14 plants of Dahlia. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Dahlia in Berkeley, California? +

In Berkeley (Zone 10a), start Dahlia seeds indoors around Sunday, December 14, 2025 and transplant outdoors around Sunday, February 1, 2026.

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 Dahlia take to grow? +

Dahlia typically matures in about 90 days from transplanting. In Berkeley, that means you can expect harvest around Sunday, February 1, 2026 plus 90 days.

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

Dahlia should be started indoors 6 weeks before your last frost date. In Berkeley, that means starting around Sunday, December 14, 2025.

📚 More Dahlia Planting Guides

🗺️

Dahlia in California

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 10a Dahlia Guide

All cities in your zone · Avg dates

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Growing Dahlia in Zone 10a

Dahlia (Dahlia pinnata) is a popular garden vegetable. In Berkeley, California, which is in USDA Hardiness Zone 10a, you should start seeds indoors around Sunday, December 14, 2025.

Your average last frost date is Sunday, January 25, 2026. Plan to transplant your Dahlia seedlings outdoors around Sunday, February 1, 2026, about 1 weeks after your last frost date.