When to Plant Dahlia in Duluth, Minnesota (55807)

Location

Duluth, Minnesota

ZIP Code

55807

USDA Zone

Last Frost

Tuesday, May 5, 2026

📅 Planting Calendar

Start Seeds Indoors Tuesday, March 24, 2026

Transplant Outdoors Tuesday, May 12, 2026

Pro Tip: Start Dahlia seeds indoors 6 weeks before your last frost date, then transplant outdoors around Tuesday, May 12, 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 Duluth?

Get your seeds now so they're ready by Tuesday, March 24, 2026.

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Growing Dahlia in Zone 4b

Dahlia (Dahlia pinnata) is a popular garden vegetable. In Duluth, Minnesota, which is in USDA Hardiness Zone 4b, you should start seeds indoors around Tuesday, March 24, 2026.

Your average last frost date is Tuesday, May 5, 2026. Plan to transplant your Dahlia seedlings outdoors around Tuesday, May 12, 2026, about 1 weeks after your last frost date.