When to Plant Dahlia in Duncans Mills, California (95430)

Location

Duncans Mills, California

ZIP Code

95430

USDA Zone

Last Frost

Tuesday, February 10, 2026

📅 Planting Calendar

Start Seeds Indoors Tuesday, December 30, 2025

Transplant Outdoors Tuesday, February 17, 2026

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 Duncans Mills?

Get your seeds now so they're ready by Tuesday, December 30, 2025.

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Growing Dahlia in Zone 9b

Dahlia (Dahlia pinnata) is a popular garden vegetable. In Duncans Mills, 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.