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Can You Grow Broccoli in Colorado?
US · USDA Zone 5b · zones 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b
Broccoli grows well here as a spring or fall crop — time planting to avoid peak summer heat.
Plant zones
Colorado last frost
Colorado first frost
Days to harvest
When to plant Broccolis in Colorado
Start indoors
Transplant
Harvest
Dates are approximate, based on Colorado's average frost dates. Your exact yard may vary by microclimate.
About Broccoli
Broccoli is a cool-season crop that produces best in spring and fall when temperatures are moderate.
Start indoors 6-8 weeks before last frost for spring planting or direct sow in midsummer for fall. Harvest the main head before it flowers — side shoots continue producing after.
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 Broccoli in Colorado?
Broccoli grows well here as a spring or fall crop — time planting to avoid peak summer heat.
What zone is Colorado?
Colorado spans USDA Zone 5b (3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b).
When do you plant Broccolis in Colorado?
Plant Broccolis around early April (start indoors Feb 23), harvest Jun 6 – Jun 26.