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How to grow butternut squash
Plant once the soil has warmed.
Butternut squash seeds won't germinate in cold soil, so it's necessary to plant them once you're certain the last frost has passed. In warmer climates this could be in mid-spring, and in cooler climates you might have to wait until late spring.
If you plant your squash too early, it won't survive. If you want to get a head start, you can start the seeds indoors up to 3 weeks before the last frost.