When to Plant Collard Green in Columbiaville, Michigan (48421)
Location
Columbiaville, Michigan
ZIP Code
48421
USDA Zone
6a
Last Frost
Monday, April 20, 2026
📅 Planting Calendar
Start Seeds Indoors Monday, February 23, 2026
Transplant Outdoors Monday, May 4, 2026
Pro Tip: Start Collard Green seeds indoors 8 weeks before your last frost date for best results.
🌿 Plant Details
Scientific Name Brassica oleracea
Days to Maturity 168 days
☀️ Growing Requirements
☀️
Sun
Full Sun
💧
Water
Regular
Seeds typically germinate in 8-21 days
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Growing Collard Green in Zone 6a
Collard Green (Brassica oleracea) is a popular garden vegetable. In Columbiaville, Michigan, which is in USDA Hardiness Zone 6a, you should start seeds indoors around Monday, February 23, 2026.
Your average last frost date is Monday, April 20, 2026. Plan to transplant your Collard Green seedlings outdoors around Monday, May 4, 2026, about 2 weeks after your last frost date.