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Can You Grow Winter Squash in Wisconsin?
US · USDA Zone 5a · zones 3b, 4a, 4b, 5a, 5b
Winter squash grows well here with warm summers — it needs heat to mature and set fruit.
Plant zones
Wisconsin last frost
Wisconsin first frost
Days to harvest
When to plant Winter Squashes in Wisconsin
Start indoors
Transplant
Harvest
Dates are approximate, based on Wisconsin's average frost dates. Your exact yard may vary by microclimate.
About Winter Squash
Winter squash (butternut, acorn, spaghetti) are the long-storing hard-skinned squash you plant in spring and harvest in fall. Vigorous, sprawling, and highly productive.
Direct sow or start indoors 4 weeks before last frost; transplant after frost. Give vines room (6-8 ft) or a trellis. Harvest when skin is hard and you can't dent it with a fingernail. Cure in a warm place for 1-2 weeks for long storage.
Gardening in Wisconsin
Wisconsin has a cold humid continental climate. Milwaukee is Zone 5b-6a; northern Wisconsin is Zone 4a-5a. Cold winters but warm productive summers. Known for dairy farming and cold-hardy crops.
Frequently asked questions
Can you grow Winter Squash in Wisconsin?
Winter squash grows well here with warm summers — it needs heat to mature and set fruit.
What zone is Wisconsin?
Wisconsin spans USDA Zone 5a (3b, 4a, 4b, 5a, 5b).
When do you plant Winter Squashes in Wisconsin?
Plant Winter Squashes around mid-April (start indoors Mar 18), harvest Jul 14 – Aug 13.