Potential weight (in pounds) of giant pumpkins (an official classification), according to the Agricultural Marketing Resource Center. Americans consume about 5 pounds of pumpkin per person per year—most of it in the fall. Some 90% of all canned pumpkin is produced by one firm—Libby. More than 1.5 billion pounds of pumpkin are grown each year in the U.S. Illinois (who knew?) is the leading state.