When to Plant Acorn Squash in Boulder, Colorado (80310)
Location
Boulder, Colorado
ZIP Code
80310
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 Acorn Squash seeds indoors 4 weeks before your last frost date for best results.
🌿 Plant Details
Scientific Name Cucurbita pepo
Days to Maturity 85 days
☀️ Growing Requirements
☀️
Sun
Full Sun
💧
Water
Regular
Seeds typically germinate in 7-14 days
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Growing Acorn Squash in Zone 6a
Acorn Squash (Cucurbita pepo) is a popular garden vegetable. In Boulder, Colorado, 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 Acorn Squash seedlings outdoors around Monday, May 4, 2026, about 2 weeks after your last frost date.