When to Plant Dahlia in Waterbury, Connecticut (06721)

Location

Waterbury, Connecticut

ZIP Code

06721

USDA Zone

Last Frost

Wednesday, April 15, 2026

📅 Planting Calendar

Start Seeds Indoors Wednesday, March 4, 2026

Transplant Outdoors Wednesday, April 22, 2026

Pro Tip: Start Dahlia seeds indoors 6 weeks before your last frost date, then transplant outdoors around Wednesday, April 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 Waterbury?

Get your seeds now so they're ready by Wednesday, March 4, 2026.

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Growing Dahlia in Zone 6b

Dahlia (Dahlia pinnata) is a popular garden vegetable. In Waterbury, Connecticut, which is in USDA Hardiness Zone 6b, you should start seeds indoors around Wednesday, March 4, 2026.

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