When to Plant Acorn Squash in Colorado
State
Colorado
Cities Covered
397
USDA Zones
4a, 4b, 5a, 5b, 6a, 6b, 7a
Plant Type
Indoor Start
📅 Planting Calendar for Colorado
Based on Denver (Zone 6a). Dates may vary by city.
Note: Colorado spans multiple zones (4a, 4b, 5a, 5b, 6a, 6b, 7a). Select your city below for more precise dates.
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Growing Acorn Squash in Colorado
Acorn Squash (Cucurbita pepo) is a popular garden vegetable in Colorado. The state spans USDA Hardiness Zones 4a, 4b, 5a, 5b, 6a, 6b, 7a, so planting dates can vary significantly depending on your location.
For most of Colorado, you should start Acorn Squash seeds indoors around Monday, March 23, 2026, then transplant outdoors around Monday, May 4, 2026.
For the most accurate planting dates, enter your ZIP code on our homepage or select your city from the list above.