When to Plant Butternut Squash in Bay City, Michigan (48708)
Location
Bay City, Michigan
ZIP Code
48708
USDA Zone
6a
Last Frost
Monday, April 20, 2026
📅 Planting Calendar
Start Seeds Indoors Monday, March 23, 2026
Transplant Outdoors Monday, May 4, 2026
Pro Tip: Start Butternut Squash seeds indoors 4 weeks before your last frost date for best results.
🌿 Plant Details
Scientific Name Cucurbita moschata
Days to Maturity 100 days
☀️ Growing Requirements
☀️
Sun
Full Sun
💧
Water
Regular
Seeds typically germinate in 7-14 days
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Growing Butternut Squash in Zone 6a
Butternut Squash (Cucurbita moschata) is a popular garden vegetable. In Bay City, Michigan, which is in USDA Hardiness Zone 6a, you should start seeds indoors around Monday, March 23, 2026.
Your average last frost date is Monday, April 20, 2026. Plan to transplant your Butternut Squash seedlings outdoors around Monday, May 4, 2026, about 2 weeks after your last frost date.