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Winter Squash Seed Starting Tips

Start winter squash seed in spring after all danger of frost has passed and the soil has warmed to 70°F. This is butternut squash.

Winter squash plantsWinter squash are tender, warm-weather crops very similar to summer squashes. But, winter squashes—unlike summer squashes—must fully mature on the vine before harvest.

Summer squashes can be picked and eaten immature; they have a succulent texture. Winter squashes are drier and more fibrous than summer squashes.

Winter squashes include acorn, banana, buttercup, butternut, cushaw delicious, Hubbard, marrow, and pumpkin.

Sow winter squash indoor 4 to 3 weeks before the last expected frost in spring. Sow winter squash outdoors when the soil temperature has warmed to 70°F (21°C). Protect squash in the garden from cool temperatures with row covers.

Summer squash mature 60 to 100 frost-free days after sowing.

Winter Squash Sowing and Planting Tips

  • Grow winter squash from seeds or seedlings.
  • Seed is viable for 6 years.
  • Direct sow winter squash in the garden in spring after all danger of frost has passed and the soil has warmed to 70°F (21°C). In warm-winter regions, sow squash in midwinter for harvest in early summer.
  • Winter squash seeds will not germinate at a soil temperature below 66°F (18°C).
  • To start plants indoors, sow seed in peat pots 4 to 3 weeks before the last frost in spring. The indoor temperature should be 66°F to 85°F (18-29°C) until germination.
  • Sow seed ½ to 1 inch (1.3-2.5 cm) deep.
  • Seeds germinate in 4 to 10 days at 85°F (29°C) or warmer.
  • Transplant winter squash into the garden after the soil has warmed to at least 70°F (21°C).
  • Space plants in the garden 12 to 18 inches (30-45 cm) apart in all directions.
  • Winter squash will benefit from the warm soil created by planting on hills or mounds; raise the soil 12 inches (30 cm) tall and 20 inches (50 cm) wide and grow individual plants on hills. Space hills 4 to 5 feet (1.2-1.5 m) apart.
  • Water to keep the soil from drying.
  • Fertilize with fish emulsion or a soluble complete fertilizer at half strength.
  • Add aged compost to planting beds in advance of transplanting.
  • Winter squash prefer a soil pH range of 5.5 to 6.8.
  • Grow winter squash in full sun for best yield.
  • Avoid planting winter squash where cucumbers or melons have grown recently.
  • Common squash pest enemies include aphids, cucumber beetles, flea beetles, squash bugs, squash vine borers, slugs, and snails.
  • Common diseases include bacterial wilt, fusarium wilt, downy mildew, powdery mildew, cucumber mosaic.

More tips at How to Grow Winter Squash.

Interplanting: Plant winter squash with bush beans, corn, dill, eggplant, lettuce, cucumbers, summer squash, and tomatoes.

Container Growing: Squashes are not a good choice for container growing. They require significant room to spread and grow.

Winter Squash Planting Calendar

  • 4-3 weeks before the last frost in spring: start seed indoors for transplanting into the garden later.
  • 2-3 weeks after the last frost in spring: transplant seedlings to the garden.
  • 3 weeks after the last frost in spring: direct sow seed in the garden; minimum soil temperature 65°
Squash on mound
Winter squash will benefit from the warm soil created by planting on hills or mounds;

Winter Squash Recommended Varieties

There many types and varieties of winter squash; here are a few:

  • Acorn: acorn-shaped, dark green fruit to 2 pounds.
  • Banana: smooth gray-green skin, light orange flesh to 18 inches long.
  • Butternut: tan-yellow skin, orange fleshy pulp; elongated pear-shape with a bulbous compartment of seeds at the blossom end
  • Buttercup: squat acorn shape; blackish-green rind with yellow-orange flesh.
  • Cushaw: green-striped gourd to 15 inches long.
  • Hubbard: bluish, gray, orange or dark green, smooth and warty skin.
  • Pumpkins are winter squashes.
  • Turban: bright-colored, turban-shaped shells 6 to 7 inches in diameter.

Botanical Names: Cucurbita maxima, Cucurbita moschata, Cucurbita pepo.

Winter squash are members of the Cucurbitaceae family; other members cucumbers, melons, watermelon, and pumpkins.

More tips at Squash and Pumpkin Growing Tips.

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    • All young seedlings can grow leggy, including squash. Legginess is caused by the plant stretching for as much sunlight as possible. If your seedlings are growing in a window, be sure to turn them daily–this reduce legginess. If you are growing your seedlings under a grow light, keep the light just a few inches above the seedlings. Gently brush the seedlings each day with the back of your hand or place a fan nearby to give them a gentle breeze; this will help the stems grow strong and stout.

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