Butternut Squash is an annual grown for its fruit, ready to harvest about 100 days after planting. It's hardy across USDA zones 2 through 11. Its summer flowers are a moderate draw for honeybees and native bees, even though the fruit is the prize. As a cucurbit (squash, melon, and cucumber), give it a fresh bed each year — away from where its relatives just grew — so the soil-borne pests and diseases of the family never get a foothold.
Zones
2-11
pH Range
4.5-8.3
Sun
Full Sun
Days to Maturity
100
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What Butternut Squash is
Butternut Squash grows as an annual and reaches around a foot and a half at maturity. It blooms yellow in summer.
How to grow Butternut Squash
Butternut Squash grows in USDA zones 2 through 11 and is ready to harvest about 100 days after planting. Butternut Squash does best in full sun — at least 6 hours of direct sun a day — and soil from pH 4.5 to 8.3, on well-drained ground. It needs around 2,200 growing degree days to mature and a growing season of at least 80 frost-free days, which is why climate matters as much as soil.
USDA Zones
2-11
USDA PHZM 2023
Soil pH
4.5 - 8.3
USDA PLANTS Database
Sun
Full Sun
plant_species_v5.csv
Drainage
well (dry spells)
plant_species_v5.csv
Frost Tolerance
50°F
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Days to Maturity
100 days
Winter squash (Butternut convention).
OSU-PNW; Cornell
GDD Required
2200+
plant_species_v5.csv
Mature Height
1.5 ft
plant_species_v5.csv
Frost-Free Days
80+
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Start the season right
Plant butternut squash in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Butternut Squash prefers pH 4.5 to 8.3 (USDA PLANTS Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at maturity
Butternut Squash is ready about 100 days after planting (OSU-PNW; Cornell). Pick when the fruit is full-colored and parts easily from the stem.
Good to know
Good news for pet owners — butternut squash isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Butternut Squash offers moderate value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Butternut Squash thrives
On hardiness alone, butternut squash grows across most of the country — its range (USDA zones 2 through 11) is unusually wide. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
Zones 2–11·Where Butternut Squash growsOpen map →
Continental US shown — Alaska and US Pacific territories sit outside the federal map's polygon dataset.
On USDA hardiness-zone overlap, Butternut Squash can grow in these states:
See if Butternut Squash will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether butternut squash actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Frequently Asked Questions
Can I grow Butternut Squash in my zone?
Butternut Squash grows in USDA hardiness zones 2 through 11 (USDA PHZM 2023). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
How long does Butternut Squash take to grow?
Butternut Squash is ready to harvest about 100 days after planting (OSU-PNW; Cornell). Your local frost dates and soil temperature move that window earlier or later.
When should you plant Butternut Squash?
Most growers plant butternut squash after the last spring frost, once the soil has warmed, leaving enough of the season for its 80-day frost-free need. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Butternut Squash need?
Butternut Squash needs full sun — a spot that catches at least 6 hours of direct summer sun a day. In more shade it still grows, but usually gives a smaller, later crop. The catch is that a yard rarely gets even light everywhere — a fence, the house, or one tall tree can quietly take those hours. A Growable Ground report reads the real sun-hours across your land, canopy and buildings included, so you can pick the brightest bed before you plant.
What soil does Butternut Squash need?
Butternut Squash prefers soil pH 4.5 to 8.3, on well-drained ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Butternut Squash attract pollinators?
Yes — butternut squash's flowers are a solid nectar source for honeybees and native bees (Xerces Society, Pollinator Partnership).
Is Butternut Squash safe for pets?
Butternut Squash is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.