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Can You Grow Cauliflower in Colorado?
US · USDA Zone 5b · zones 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b
Cauliflower grows well here if you time it for your cool season — fall crops are often more reliable than spring.
Plant zones
Colorado last frost
Colorado first frost
Days to harvest
When to plant Cauliflowers in Colorado
Start indoors
Transplant
Harvest
Dates are approximate, based on Colorado's average frost dates. Your exact yard may vary by microclimate.
About Cauliflower
Cauliflower is one of the most rewarding cool-season brassicas — and one of the trickiest. It forms a dense white head that needs steady cool weather and consistent moisture.
Start indoors 6 weeks before last frost; transplant 2-3 weeks before last frost. Blanch heads by tying leaves over them once they're 2-3 inches across. Harvest before curds loosen.
Gardening in Colorado
Colorado has a semi-arid mountain climate with intense sunshine and low humidity. Front Range cities like Denver are Zone 5-6; higher elevations are Zones 3-4.
Frequently asked questions
Can you grow Cauliflower in Colorado?
Cauliflower grows well here if you time it for your cool season — fall crops are often more reliable than spring.
What zone is Colorado?
Colorado spans USDA Zone 5b (3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b).
When do you plant Cauliflowers in Colorado?
Plant Cauliflowers around early April (start indoors Feb 23), harvest Jun 6 – Jul 16.