When to Plant Rosemary in Baton Rouge, Louisiana (70821)
Location
Baton Rouge, Louisiana
ZIP Code
70821
USDA Zone
9a
Last Frost
Saturday, February 20, 2027
📅 Planting Calendar
Start Seeds Indoors Saturday, December 12, 2026
Transplant Outdoors Saturday, March 6, 2027
Pro Tip: Start Rosemary seeds indoors 10 weeks before your last frost date for best results.
🌿 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
🤝 Good Companions
BeanCabbageCarrotSage
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Growing Rosemary in Zone 9a
Rosemary (Salvia rosmarinus) is a popular garden vegetable. In Baton Rouge, Louisiana, which is in USDA Hardiness Zone 9a, you should start seeds indoors around Saturday, December 12, 2026.
Your average last frost date is Saturday, February 20, 2027. Plan to transplant your Rosemary seedlings outdoors around Saturday, March 6, 2027, about 2 weeks after your last frost date.