When to Plant Dahlia in Oak Brook, Illinois (60523)

Location

Oak Brook, Illinois

ZIP Code

60523

USDA Zone

Last Frost

Monday, April 20, 2026

📅 Planting Calendar

Start Seeds Indoors Monday, March 9, 2026

Transplant Outdoors Monday, April 27, 2026

Pro Tip: Start Dahlia seeds indoors 6 weeks before your last frost date, then transplant outdoors around Monday, April 27, 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 Oak Brook?

Get your seeds now so they're ready by Monday, March 9, 2026.

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Growing Dahlia in Zone 6a

Dahlia (Dahlia pinnata) is a popular garden vegetable. In Oak Brook, Illinois, which is in USDA Hardiness Zone 6a, you should start seeds indoors around Monday, March 9, 2026.

Your average last frost date is Monday, April 20, 2026. Plan to transplant your Dahlia seedlings outdoors around Monday, April 27, 2026, about 1 weeks after your last frost date.