When to Plant Dahlia in Sacramento, California (94271)

Location

Sacramento, California

ZIP Code

94271

USDA Zone

Last Frost

Tuesday, February 10, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Tuesday, December 30, 2025

Transplant Outdoors

Tuesday, February 17, 2026

Based on last frost Tuesday, February 10, 2026 · Zone 9b

Pro tip: Start Dahlia seeds indoors 6 weeks before your last frost date, then transplant outdoors around Tuesday, February 17, 2026.

🌿 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 Sacramento?

Get your seeds now so they're ready by Tuesday, December 30, 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 Sacramento, California? +

In Sacramento (Zone 9b), start Dahlia seeds indoors around Tuesday, December 30, 2025 and transplant outdoors around Tuesday, February 17, 2026.

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

The average last spring frost date for Sacramento, California (ZIP 94271) is around Tuesday, February 10, 2026. This is based on NOAA climate normals for USDA Zone 9b.

How long does Dahlia take to grow? +

Dahlia typically matures in about 90 days from transplanting. In Sacramento, that means you can expect harvest around Tuesday, February 17, 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 Sacramento, that means starting around Tuesday, December 30, 2025.

📚 More Dahlia Planting Guides

🗺️

Dahlia in California

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 9b Dahlia Guide

All cities in your zone · Avg dates

→

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Growing Dahlia in Zone 9b

Dahlia (Dahlia pinnata) is a popular garden vegetable. In Sacramento, California, which is in USDA Hardiness Zone 9b, you should start seeds indoors around Tuesday, December 30, 2025.

Your average last frost date is Tuesday, February 10, 2026. Plan to transplant your Dahlia seedlings outdoors around Tuesday, February 17, 2026, about 1 weeks after your last frost date.