Hubbard is a tear-shaped squash comes in several varieties: green (true), golden, blue, and baby blue. It ranges from dark green to orange and weighs from 5 to 50 pounds.
Because of its size, hubbard’s popularity has decreased over the years. However, pre-cut portions of green and orange hubbard can be found in markets.
Green hubbards are thick, sweet, and dry.
Golden hubbards—a smaller squash than the green or blue—are fairly sweet, but have a bitter aftertaste. CDC.gov - 5 a Day
"Of the origin of the Hubbard squash we have no certain knowledge. The facts relative to its cultivation in Marblehead are simply these. Upwards of twenty years ago, a single specimen was brought into town, the seed from which was planted in the garden of a lady, now deceased; a specimen form this yield was given to Captain Knott Martin, of this town, who raised it for family use for a few years, when it was brought to our notice in the year 1842 or '43. We were first informed of its good qualities by Mrs. Elizabeth Hubbard, a very worthy lady, through whom we obtained seed from Capt. Martin. as the squash up to this time had no specific name to designate it from other varieties, my father termed it the 'Hubbard Squash.'"
Letter by James J.H.Gregory
December, 1857, The Magazine of Horticulture