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Winter Squash

Butternut

Cucurbitaceae

Spacing1 per sq ft
Days to Harvest100d
Expected Yield3-5 fruits per plant

Winter Squash

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Variety History

Butternut squash was developed in the 1940s in Massachusetts as a cross between gooseneck and Hubbard types. It has become the most popular winter squash for its sweet flavor, manageable size, and excellent storage.

Regional Context

Winter squash grows beautifully in the PNW. Our long mild autumns give plenty of ripening time. Butternut, Delicata, and Kabocha are the most reliable. Pumpkins also thrive but need more space. Cure in a greenhouse or sunroom if outdoor conditions are damp.

Growing Technique

Direct sow in late May when soil is warm, or start indoors 3 weeks before transplanting. These are sprawling vines — give each plant 12-20 sq ft, or train up a sturdy trellis. Plant in hills with lots of compost. Water deeply and consistently through summer. Reduce water in September to encourage hardening. Harvest when skin is hard (can not dent with thumbnail) and stem is dry and corky — typically late September to October. Cure in warm (80°F) spot for 10 days, then store at 50-55°F.

Watch For

  • Powdery mildew by August/September is normal — squash will still ripen if leaves are partially affected. Squash bugs and cucumber beetles — hand-pick and use floating row cover on young plants, remove when flowers appear for pollination. Harvest too early and squash will not store — the thumbnail test is non-negotiable. Curing is essential for storage — skip this step and squash rot within weeks.

Recipes