When to Plant Butternut Squash
The most popular winter squash, producing sweet, nutty-flavored fruits that store for months. A garden-to-pantry staple.
The Short Answer
How to Grow Butternut Squash
Butternut is the winter squash standard — sweeter than acorn, more flavorful than spaghetti squash, and stores longer than almost any other variety (3-6 months at room temperature). The harvest indicator: the stem turns corky and dry, the skin can't be dented by your thumbnail, and the ground spot turns from white to tan. Waltham Butternut is the classic open-pollinated variety; Honeynut is a smaller, sweeter mini-butternut that matures faster. Butternut's sweetness actually increases in storage as starches convert to sugars — squash stored for 2 months tastes better than squash eaten the day it's picked.
Starting Seeds Indoors
Begin butternut squash seeds indoors 3 weeks before your average last frost date. Seeds need soil temperatures of at least 60°F to germinate, which typically takes 5-10 days. Provide 12 hours of light per day using a south-facing window or grow lights.
Transplanting
Move seedlings outside 2 weeks after your last frost date, once soil temperatures reach 60°F. Harden off seedlings for 7 days before transplanting by gradually exposing them to outdoor conditions.
Direct Sowing
Butternut Squash can be direct sown 2 weeks after your last frost date. Plant seeds 1" deep, spaced 48" apart.
Growing Tips
Harvest when stem is dry and corky, skin resists thumbnail, and bottom turns tan. Cure in sun for 10 days. Properly cured butternut stores 3-6 months at room temperature. Sweetness increases in storage.
Companion Planting
Good companions:
Keep away from:
Butternut Squash Planting Dates by State
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Last reviewed: March 29, 2026