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Can You Grow Butternut Squash in California?

US · USDA Zone 9b · zones 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b

Grows well here

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

Plant zones

3a–10b

California last frost

mid-January

California first frost

late December

Days to harvest

100–120 days

When to plant Butternut Squashes in California

Start indoors

Jan 1

Transplant

Jan 10

Harvest

Apr 20 – May 10

Dates are approximate, based on California'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 California

California spans more climate zones than any other state. Coastal regions are mild year-round; the Central Valley is hot and productive; mountains are cold; deserts are extreme.