When to Plant Rosemary in Bancroft, Wisconsin (54921)
Location
Bancroft, Wisconsin
ZIP Code
54921
USDA Zone
4b
Last Frost
Tuesday, May 5, 2026
📅 Planting Calendar
Start Seeds Indoors Tuesday, February 24, 2026
Transplant Outdoors Tuesday, May 19, 2026
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
Other Plants for Bancroft
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Growing Rosemary in Zone 4b
Rosemary (Salvia rosmarinus) is a popular garden vegetable. In Bancroft, Wisconsin, which is in USDA Hardiness Zone 4b, you should start seeds indoors around Tuesday, February 24, 2026.
Your average last frost date is Tuesday, May 5, 2026. Plan to transplant your Rosemary seedlings outdoors around Tuesday, May 19, 2026, about 2 weeks after your last frost date.