When to Plant Dahlia in Cullen, Louisiana (71021)

Location

Cullen, Louisiana

ZIP Code

71021

USDA Zone

Last Frost

Sunday, March 15, 2026

📅 Planting Calendar

Start Seeds Indoors Sunday, February 1, 2026

Transplant Outdoors Sunday, March 22, 2026

Pro Tip: Start Dahlia seeds indoors 6 weeks before your last frost date, then transplant outdoors around Sunday, March 22, 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 Cullen?

Get your seeds now so they're ready by Sunday, February 1, 2026.

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Growing Dahlia in Zone 8b

Dahlia (Dahlia pinnata) is a popular garden vegetable. In Cullen, Louisiana, which is in USDA Hardiness Zone 8b, you should start seeds indoors around Sunday, February 1, 2026.

Your average last frost date is Sunday, March 15, 2026. Plan to transplant your Dahlia seedlings outdoors around Sunday, March 22, 2026, about 1 weeks after your last frost date.