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Can You Grow Watermelon in Colorado?

US · USDA Zone 5b · zones 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b

Grows well here

Watermelons thrive here — they love the long warm season your zone provides.

Plant zones

4b–11b

Colorado last frost

early April

Colorado first frost

late October

Days to harvest

70–90 days

When to plant Watermelons in Colorado

Start indoors

Mar 10

Transplant

Apr 7

Harvest

Jun 16 – Jul 6

Dates are approximate, based on Colorado's average frost dates. Your exact yard may vary by microclimate.

About Watermelon

Watermelons love heat space and sun — they are a rewarding crop but need a long warm season.

Start indoors 4 weeks before last frost. Transplant carefully — watermelons hate root disturbance. Give them maximum space. Use black plastic mulch to warm soil. Choose icebox varieties for containers.

Full watermelon growing guide →

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.