When to Plant Collard Green in Grace City, North Dakota (58445)
Location
Grace City, North Dakota
ZIP Code
58445
USDA Zone
4a
Last Frost
Friday, May 15, 2026
📅 Planting Calendar
Start Seeds Indoors Friday, March 20, 2026
Transplant Outdoors Friday, May 29, 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 4a
Collard Green (Brassica oleracea) is a popular garden vegetable. In Grace City, North Dakota, which is in USDA Hardiness Zone 4a, you should start seeds indoors around Friday, March 20, 2026.
Your average last frost date is Friday, May 15, 2026. Plan to transplant your Collard Green seedlings outdoors around Friday, May 29, 2026, about 2 weeks after your last frost date.