When to Plant Dahlia in New Portland, Maine (04954)

Location

New Portland, Maine

ZIP Code

04954

USDA Zone

Last Frost

Sunday, May 10, 2026

📅 Planting Calendar

Start Seeds Indoors Sunday, March 29, 2026

Transplant Outdoors Sunday, May 17, 2026

Pro Tip: Start Dahlia seeds indoors 6 weeks before your last frost date, then transplant outdoors around Sunday, May 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 New Portland?

Get your seeds now so they're ready by Sunday, March 29, 2026.

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Growing Dahlia in Zone 5a

Dahlia (Dahlia pinnata) is a popular garden vegetable. In New Portland, Maine, which is in USDA Hardiness Zone 5a, you should start seeds indoors around Sunday, March 29, 2026.

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