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Can You Grow Butternut Squash in Idaho?

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

Grows well here

Butternut squash thrives here with warm, frost-free summers and full sun.

Plant zones

3a–10b

Idaho last frost

mid-March

Idaho first frost

mid-November

Days to harvest

100–120 days

When to plant Butternut Squashes in Idaho

Start indoors

Feb 14

Transplant

Mar 15

Harvest

Jun 23 – Jul 13

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

About Butternut Squash

Butternut squash is the most popular winter squash — sweet, smooth, and superb for storage. A vigorous vining plant that needs warm weather and room to sprawl.

Direct sow after last frost or start indoors 3-4 weeks earlier. Harvest when skin turns tan and hard. Cure 1-2 weeks in a warm spot before storing in a cool dry place.

Full butternut squash 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.