Kabocha Squash is grown for its fruit, ready to harvest about 95 days after planting. It's hardy across USDA zones 3 through 11. Its 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
3-11
pH Range
5-8.5
Sun
Full Sun
Days to Maturity
95
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See Kabocha Squash
What Kabocha Squash is
Kabocha Squash reaches around two feet at maturity.
How to grow Kabocha Squash
Kabocha Squash grows in USDA zones 3 through 11 and is ready to harvest about 95 days after planting. Kabocha Squash does best in full sun — at least 6 hours of direct sun a day — and soil from pH 5 to 8.5, 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
3-11
USDA PHZM 2023
Soil pH
5 - 8.5
USDA PLANTS Database
Sun
Full Sun
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Drainage
well (dry spells)
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Frost Tolerance
48.2°F
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Days to Maturity
95 days
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GDD Required
2200+
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Mature Height
2 ft
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Frost-Free Days
80+
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Start the season right
Plant kabocha 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
Kabocha Squash prefers pH 5 to 8.5 (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
Kabocha Squash is ready about 95 days after planting (University Extension production guides). Pick when the fruit is full-colored and parts easily from the stem.
Good to know
Good news for pet owners — kabocha squash isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Kabocha Squash offers moderate value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Kabocha Squash thrives
On hardiness alone, kabocha squash grows across most of the country — its range (USDA zones 3 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 3–11·Where Kabocha Squash growsOpen map →
On USDA hardiness-zone overlap, Kabocha Squash can grow in these states:
See if Kabocha Squash will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether kabocha squash actually takes — we score it against the real conditions at your address.
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Frequently Asked Questions
Can I grow Kabocha Squash in my zone?
Kabocha Squash grows in USDA hardiness zones 3 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 Kabocha Squash take to grow?
Kabocha Squash is ready to harvest about 95 days after planting (University Extension production guides). Your local frost dates and soil temperature move that window earlier or later.
When should you plant Kabocha Squash?
Most growers plant kabocha 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 Kabocha Squash need?
Kabocha 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 Kabocha Squash need?
Kabocha Squash prefers soil pH 5 to 8.5, on well-drained ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Kabocha Squash attract pollinators?
Yes — kabocha squash's flowers are a solid nectar source for honeybees and native bees (Xerces Society, Pollinator Partnership).
Is Kabocha Squash safe for pets?
Kabocha Squash is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.