By Nik Crawley, founder of GardenTrack · Updated July 23, 2026
✓ In your garden
Blue Hubbard is the giant of the winter-squash bin — a slate blue-grey, bumpy, teardrop behemoth that commonly runs 15–20 pounds and can top 40. Its shell is genuinely rock-hard and thick, hard enough that people cut it with cleavers or just bake it whole. That armor is the point: uncut and cured it keeps for five or six months, longer than any other squash here, wrapped around sweet, dry, deep-orange flesh built for pies and soup. It's also a famous squash-bug trap crop.
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a large slate blue-grey Blue Hubbard squash with a bumpy warted rind, tapering to a point at both ends, flanked by two bright-orange pumpkins for scale · Photo: Jamain
(CC BY-SA 3.0, via Wikimedia Commons)
· source
“A 15-to-40-pound slate-blue behemoth with a rock-hard warty shell that genuinely fights you at the cutting board, then pays you back with sweet, dry, keeps-for-months flesh.”
Days to maturity100–110 daysa long season to size up + harden
Size15–20 lb (up to ~40)one squash feeds a crowd
SpeciesCucurbita maximaborer-magnet — also a trap crop
Storage5–6 monthsthe best keeper here, cured
Storage & fleshThe keeper 5/5
Uncut and cured, a Blue Hubbard keeps about 5–6 months — the best-storing squash in this group — with deep golden-orange, dense (not watery) flesh that's the archetypal old New England pie-and-bake squash.
Yield per plantFeeds a crowd 5/5
One fruit is genuinely a meal for many, and batch-processing a single Hubbard into frozen or canned purée can stock a freezer — huge return per plant if you have the space and a crowd to feed.
Cutting & using itRock-hard & huge 2/5
The thick, hard shell is no exaggeration — a chef's knife alone often won't do it, and growers resort to cleavers, mallets, dropping it, or baking it whole (a real safety caution). And once you open it you must process a huge amount at once; a cut Hubbard lasts only days in the fridge.
Pests & spaceBorer-magnet, sprawling 2/5
As a Cucurbita maxima it's among the most squash-vine-borer-susceptible squash (the opposite of borer-resistant butternut), and it also attracts squash bugs. The big sprawling vines plus a 100+ day season make it a poor fit for small or short-season gardens.
The ultimate keeper and crowd-feeder — you just need a cleaver, a crowd, and room to run.
SweetDryFine-grainedDeep-orange
✓ Months of storage + a crowd-sized harvest~ Rock-hard shell — cut it with care (or bake it whole)✗ Not for small beds or short seasons
Numbers from university growing guides. Ratings are our take, judged against all winter squash. Tap a meter to see why.
Growing basics — shared by every winter squash
Blue Hubbard Squash grows like any other winter squash. The full picture — how deep to plant, spacing, feeding, pests, harvest — lives on the Winter Squash page so it's maintained in one place.
✓Pies, custards & bakingThe traditional pumpkin substitute.Great
✓Soups & puréesDry flesh thickens well.Great
✓Batch-processing to freezeOne fruit yields a freezer's worth.Great
✓Trap crop on the perimeterDecoys squash bugs off other squash.Great
✗A quick weeknight squashHuge and rock-hard — not a fast one.Skip it
Our take, from how it grows and cooks — kitchens vary.
What Blue Hubbard Squash is known for
We hold one description of this variety and no record of who made it, so it is not printed here.
An unattributed claim about a plant is a claim we would be making ourselves, and we would rather
show you the gap than fill it.
Greenhouse or cover on: your start slides ~4 weeks earlier and your harvest stretches ~3 weeks later (shown striped).
Planting seeds straight in the ground only works where the season's long and warm — most gardeners start seeds indoors or buy young plants, or you'd pick your first tomato right as frost hits.
Comfortable — first ripe fruit lands around early Aug, well before your typical frost (~late Oct).
Plant seeds outside
early May – early May
Growing
early May – early Aug
Picking
early Aug – early Sep
Typical dates for zone 6b — set your zone or ZIP above for yours.
Growing Blue Hubbard Squash — the things that trip people up
Grow it if you have space and a crowd. One 15–40 lb Blue Hubbard feeds many and, cured, keeps 5–6 months — the best keeper here — but the vines sprawl (hills 3–5 ft apart) and it needs 100+ warm days, so short-season growers should start transplants early.
Respect the shell. It's genuinely rock-hard and thick — a chef's knife often won't do it. Use a cleaver, score-and-tap with a mallet, or just bake it whole and cut it after. This is a real safety note, not marketing color. Once cut, process it all at once (freezing purée is the usual answer).
Cure it to store, and consider the trap-crop trick. Cure 1–2 weeks at 80–85°F, then store around 50–55°F (Hubbards store best with the stem removed entirely). As a C. maxima it's a squash-bug and vine-borer magnet — which is why a Blue Hubbard perimeter is a famous decoy that pulls pests off your other squash. Set your zone on the [winter squash page](/plants/squash-winter/) for your dates.
From university growing guides (see Sources).
Where Blue Hubbard comes from
Blue Hubbard is a Cucurbita maxima, a species domesticated in the Andean region of South America thousands of years ago. The Hubbard type traces to a large squash brought to Marblehead, Massachusetts in 1854; the local seedsman James J. H. Gregory named and popularized it, and by the late 1800s the blue-skinned selection — Blue Hubbard — became the most successful of the hubbards.
(A note to avoid confusion: the smaller 'Baby Blue Hubbard' is a separate 1953 University of New Hampshire cross of Blue Hubbard × Bush Buttercup — not the same as the full-size heirloom you plant for a giant.)
Enormous, and armored
Everything about Blue Hubbard is big. It commonly runs 15–20 pounds and standard strains reach into the 30s and 40s — one squash is genuinely a meal for a crowd — in an unmistakable slate blue-grey with a hard, thick, bumpy, warted rind, tapering to a point at both ends. Cut it open and that thick shell surrounds deep golden-orange, dense flesh.
The size cuts both ways, and it's worth being blunt about the shell. It's genuinely rock-hard: a chef's knife alone often won't crack it, and experienced growers reach for a cleaver, tap it apart with a mallet, drop it on concrete, or simply bake it whole and cut it after. That's a real safety caution, not colorful marketing. And once you open it, you're committed to processing a huge amount at once — a cut Hubbard lasts only days in the fridge, so freezing the purée is the usual plan.
a large Blue Hubbard with a chunk cut out of one end, exposing the thick hard grey rind and dense golden-orange flesh · Photo: Badagnani
(CC BY-SA 3.0, via Wikimedia Commons)
· source
A months-long keeper — and a pest decoy
The reward for the armor is storage. Uncut and properly cured, a Blue Hubbard keeps about five to six months — the best keeper of the common winter squash — so it's the classic old-New-England squash for carrying pies, custards, and soups deep into winter. Its flavor is good and improves with curing and a few weeks of rest; eaten too fresh it can read a touch bland or coarse compared with the sweeter kabochas, and its dry flesh is a virtue for thickening soup rather than a fault.
There's one more genuinely useful trick. Because Blue Hubbard so strongly attracts squash bugs, cucumber beetles, and vine borers, it's a famous trap crop: plant a Blue Hubbard perimeter about a week before your main summer squash, let the pests mass on the Hubbard, and destroy those plants (and the bugs) before they migrate. Research has cut cucumber-beetle and vine-borer pressure on the protected crop by up to 95% and 88%.
Growing Blue Hubbard
Give it full sun, rich soil, and warmth — sow after frost once soil hits ~70°F, or start transplants 3–4 weeks early to bank time on the long season. Give it real room: hills 3–5 feet apart, rows about 5 feet, because the vines run hard. It needs the whole warm season (100–110 days) to size up and harden its shell for storage.
Harvest when the rind can't be dented by a thumbnail and the stem is dry and corky. Cure at 80–85°F for a week or two to harden the skin, then store around 50–55°F — a cured Hubbard keeps best with the stem removed entirely. Handle it gently: nicked rinds rot in storage, and the fruit is heavy and awkward. As a Cucurbita maxima it's very borer- and squash-bug-prone, so scout early (or lean into the trap-crop role deliberately).
What goes wrong — and the fixes
As a Cucurbita maxima, Blue Hubbard is highly susceptible to squash vine borer (larvae tunnel the main stem and collapse the vine) and a heavy squash-bug attractor — the same traits that make it a good decoy make it vulnerable in your own patch. Row-cover until flowering and scout early, or lean into the trap-crop role deliberately.
Immature fruit at first frost won't cure or store — give it the full 100+ day season and start transplants early if yours is short. Cucumber beetles (and the bacterial wilt they vector) and late-season powdery mildew add pressure.
Handling injury is real with a fruit this heavy and awkward: nicked or bruised rinds rot in storage, so move it carefully and cure it before storing (Hubbards keep best with the stem removed entirely).
In the kitchen
Blue Hubbard is a traditional pie-and-bake squash: its sweet, dry, deep-orange flesh makes a classic pumpkin-pie substitute, thickens soups and purées beautifully, and roasts or bakes in wedges (often easiest to bake it whole first, then cut). It mashes well and stands in anywhere you'd use pumpkin.
Because one fruit yields so much, the realistic move is batch-processing — roast or steam the flesh, purée it, and freeze or can it in portions. And don't forget the garden trick: many people grow a Blue Hubbard or two on the perimeter as a deliberate trap crop, protecting their zucchini and cucumbers as much as feeding the family.
Blue Hubbard Squash winter squash at a glance
Blue Hubbard Squash Winter Squash — at a glance
Type
Hubbard
Grows as
Bush (determinate)
Days to ripe
100 days after you plant it outside
Color
Blue
Extra fields from seed-catalog listings and university growing guides. Days to ripe and disease resistance shift with your climate and seed source — double-check with your local extension office before you buy.
Watch: growing Blue Hubbard Squash
How to Direct-Sow Blue Hubbard Squash in Your Garden · Plant-Smart Living w/ Farmer Fred DetwilerHow to Cut Open a Hubbard Squash · Tracy Konoske
Embedded from their creators on YouTube — full credit and views go to the channel.
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Common questions about Blue Hubbard Squash
How do you cut a Blue Hubbard squash?
Carefully — the shell is genuinely rock-hard and thick, and a chef's knife alone often won't crack it. Experienced growers use a cleaver, score a line and tap it apart with a mallet, drop it on a hard surface to split it, or simply bake it whole and cut it once it softens. Treat cutting one as a real task with real safety caution, not a quick chop.
How long does Blue Hubbard squash store?
About 5 to 6 months uncut and cured — the best keeper of the common winter squash, and the reward for that thick hard shell. Cure it 1–2 weeks at 80–85°F, then store around 50–55°F (Hubbards keep best with the stem removed). Once you cut into one, though, it lasts only days in the fridge, so plan to process the whole thing at once and freeze the purée.
Why would I grow such a huge squash?
Two reasons. First, one 15–40 lb fruit feeds a crowd and, cured, stores for months, so a single plant can stock a freezer with purée. Second, Blue Hubbard is a famous trap crop: it so strongly attracts squash bugs, cucumber beetles, and vine borers that a perimeter of it pulls those pests off your other squash — cutting pressure on the protected crop by up to ~88–95% in research.
Is Blue Hubbard resistant to squash vine borer?
No — the opposite. As a Cucurbita maxima it's among the most susceptible squash to the vine borer (and to squash bugs), which is exactly what makes it a good decoy. If you want a borer-resistant squash to actually harvest, grow a butternut (C. moschata); grow Blue Hubbard for its storage, its size, or deliberately as a trap crop.
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