When to Plant Rosemary in Frankfort, Illinois (60423)

Location

Frankfort, Illinois

ZIP Code

60423

USDA Zone

Last Frost

Monday, April 20, 2026

📅 Planting Calendar

Start Seeds Indoors Monday, February 9, 2026

Transplant Outdoors Monday, May 4, 2026

Pro Tip: Start Rosemary seeds indoors 10 weeks before your last frost date, then transplant outdoors around Monday, May 4, 2026.

🌿 Plant Details

Scientific Name Salvia rosmarinus

Days to Maturity 120 days

Mature Height 24-48"

Spread 24"

Type Shrub

Fruit Size N/A

☀️ Growing Requirements

☀️

Sun

Full Sun (6+ hours)

💧

Water

Low (drought tolerant)

↔️

Spacing

24" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 14-21 days

Ready to Plant Rosemary in Frankfort?

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

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Growing Rosemary in Zone 6a

Rosemary (Salvia rosmarinus) is a popular garden vegetable. In Frankfort, Illinois, which is in USDA Hardiness Zone 6a, you should start seeds indoors around Monday, February 9, 2026.

Your average last frost date is Monday, April 20, 2026. Plan to transplant your Rosemary seedlings outdoors around Monday, May 4, 2026, about 2 weeks after your last frost date.