Kabocha

Family: Cucurbitaceae Vegetable

Planting Schedule

Provide your location or planting zone to unlock dates and add Kabocha to a garden.

Sink your spoon into Kabocha’s velvety, deep-orange flesh—sweet, nutty, and richly aromatic with a smooth, custard-like texture that feels made for cozy winter tables.

This 90-day winter squash develops a compact, sturdy form and a distinctive, dark green shell that turns even more handsome as it cures. Grow Kabocha for roasting and steaming, or for silky purées and hearty soups, where its naturally sweet flavor shines and its flesh stays beautifully tender.

Light: Full SunMaturity: 90 DaysHabit: Vine

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Kabocha Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	Protected Environment Only
Zone 1b	Protected Environment Only
Zone 2a	May 25th	Jun 8th	Sep 6th – Aug 29th
Zone 2b	May 15th	May 29th	Aug 27th – Aug 25th
Zone 3a	May 15th	May 29th	Aug 27th – Sep 1st
Zone 3b	May 19th	Jun 2nd	Aug 31st – Sep 21st
Zone 4a	May 15th	May 29th	Aug 27th – Sep 24th
Zone 4b	May 13th	May 27th	Aug 25th – Sep 27th
Zone 5a	May 8th	May 22nd	Aug 20th – Sep 30th
Zone 5b	May 4th	May 18th	Aug 16th – Oct 5th
Zone 6a	May 1st	May 15th	Aug 13th – Oct 10th
Zone 6b	Apr 25th	May 9th	Aug 7th – Oct 16th
Zone 7a	Apr 20th	May 4th	Aug 2nd – Oct 20th
Zone 7b	Apr 10th	Apr 24th	Jul 23rd – Oct 28th
Zone 8a	Apr 1st	Apr 15th	Jul 14th – Nov 5th
Zone 8b	Mar 23rd	Apr 6th	Jul 5th – Nov 12th
Zone 9a	Mar 6th	Mar 20th	Jun 18th – Nov 26th
Zone 9b	Feb 9th	Feb 23rd	May 24th – Dec 9th
Zone 10a	Continuous Production
Zone 10b	Continuous Production
Zone 11a	Continuous Production
Zone 11b	Continuous Production
Zone 12a	Continuous Production
Zone 12b	Continuous Production
Zone 13a	Continuous Production
Zone 13b	Continuous Production

Crop Details

Trait	Value
Days to Maturity	90
Sun Requirements	Full Sun
Growth Habit	Vine
Support Needed	Trellis
Planting Depth	Normal
Germination Temp (°F)	75
Min Soil Temp (°F)	65
Min Night Temp (°F)	55
Harden Off (days)	10

Culinary Notes

Chef's Note

Kabocha’s deep-orange flesh turns silky instead of stringy, so it purées like custard and gives soups a spoon-coating thickness. When roasted, it leans nutty and caramel-sweet, making it crave-worthy with browned fats and sharp aromatics like ginger and black pepper.

Best Uses

roast wedges until the edges turn bronzed and the interior becomes pudding-soft
steam and mash with a knob of butter for a smooth, low-effort side
silky purée for soups that need body without added cream
thickening agent for chowders and vegetarian stews—adds sweetness, not starchy heft

Flavor Profile

sweet, roasted squash flavor nutty, lightly caramelized aromatics velvety, custard-like texture soft, spoonable flesh that holds together when heated

Kitchen Pairings

brown butter sage coconut milk ginger smoked paprika black pepper

Frequently Asked Questions

What pest or disease is most likely on Cucurbita maxima (kabocha), and how do I manage it?

Cucurbita maxima commonly suffers from powdery mildew, appearing as a white-gray coating on older leaves and reducing fruit sizing late in the season. Improve airflow by pruning only the densest interior foliage, water at the base to keep leaves dry, and apply a labeled sulfur or potassium-bicarbonate fungicide when you first see spots. If vines are heavily affected, remove the worst leaves to slow spread and avoid watering late in the day.

How often should I water kabocha (Cucurbita maxima) during the main growing phase?

During active vine growth and until fruits start enlarging, keep soil consistently evenly moist but not soggy—aim for about 1 inch (2.5 cm) of water per week, increasing during hot, windy weather. When fruits are forming and swelling, water more steadily to prevent blossom-end problems and cracking—check by digging 4–6 inches down; the soil should feel moist, not wet. Avoid letting the root zone dry out completely between waterings, especially once the plants are flowering.

How can I tell when my kabocha (Cucurbita maxima) is ready to harvest?

Harvest at about 90 days, when the rind becomes fully hard and cannot be easily punctured with a fingernail. The vine/fruit stem should be slightly dry and the fruit color should look uniformly mature (often deep green to tan, depending on strain), with the skin matte rather than glossy. Cut the fruit from the vine with a short stem attached and cure it in a warm, dry place for 7–10 days for better keeping quality.