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Can You Grow Watermelon in Idaho?

US · USDA Zone 6b · zones 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

Idaho last frost

mid-March

Idaho first frost

mid-November

Days to harvest

70–90 days

When to plant Watermelons in Idaho

Start indoors

Feb 14

Transplant

Mar 15

Harvest

May 24 – Jun 13

Dates are approximate, based on Idaho'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 Idaho

Idaho has a semi-arid continental climate. Southern valleys are Zone 6-7 with hot dry summers; northern regions and mountains are colder. Excellent for root vegetables and cool crops.

See what grows well in Idaho →

Frequently asked questions

Can you grow Watermelon in Idaho?

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

What zone is Idaho?

Idaho spans USDA Zone 6b (3b, 4a, 4b, 5a, 5b, 6a, 6b).

When do you plant Watermelons in Idaho?

Plant Watermelons around mid-March (start indoors Feb 14), harvest May 24 – Jun 13.