Most pumpkins destined for cans and packaged puree go through a multi-stage industrial process that transforms whole fruit into a smooth, shelf-stable product in a matter of hours. The journey starts on farms concentrated heavily in central Illinois, where production exceeds 634 million pounds per year, more than twice the output of the next five states combined. Two of the largest pumpkin processing plants in the country sit in this region: one in Morton, Illinois, and another in nearby Princeville.
The Pumpkins Aren’t What You’d Expect
The round, bright-orange jack-o’-lantern pumpkin almost never ends up in a can. Commercial processors overwhelmingly use a variety called the Dickinson pumpkin, which looks more like an oversized butternut squash: tan-skinned, oblong, and not particularly photogenic. Dickinsons belong to the same botanical family as butternut squash, and they’re preferred because their flesh is denser, smoother, and less watery than decorative varieties. That density translates directly into a thicker, more flavorful puree with less processing required to remove moisture.
Harvesting and Receiving
Dickinson pumpkins are harvested mechanically in the fall, typically from September through November. Trucks deliver them in bulk to processing facilities, where they’re unloaded onto conveyor systems. The first step is a thorough wash to remove field dirt, debris, and any surface contamination. Workers and automated systems also inspect the pumpkins at this stage, pulling any that show rot, disease, or significant damage.
Cutting, Seeding, and Peeling
Once cleaned, the pumpkins move to cutting stations where industrial equipment splits them open and removes the seeds and stringy pulp from the central cavity. The outer rind is then stripped away, leaving only the dense orange flesh. In large-scale operations, much of this is mechanized, though the basic sequence mirrors what you’d do at home: halve, scoop, peel, and cube.
The removed seeds and fibrous pulp were traditionally discarded as waste, but processors are increasingly finding uses for them. Pumpkin seeds are rich in protein, fatty acids, and nutrients like beta-carotene, making them viable as livestock feed or ingredients in other food products. Some processing plants now collect this material and supply it to cattle operations, where it serves as a supplemental feed. The seeds are typically destroyed during processing to prevent unintended pumpkin plants from sprouting in cattle pastures through undigested seeds in manure.
Cooking and Pureeing
The peeled pumpkin flesh is cooked using steam or boiling water until it softens completely. Industrial steam cookers can process enormous volumes continuously, breaking down the cell walls of the flesh so it can be pureed into a uniform consistency. After cooking, the softened flesh passes through mechanical pulpers and finishers that mash it into a smooth puree, removing any remaining fibers or lumps.
This is where commercial and home processing diverge sharply. The National Center for Home Food Preservation specifically warns against mashing or pureeing pumpkin at home before canning, because the dense puree transfers heat so slowly that safe sterilization temperatures can’t be guaranteed throughout the jar. Commercial facilities use equipment and processes calibrated to handle puree safely, something a home kitchen simply can’t replicate.
Controlling Thickness and Quality
After pureeing, the product passes through quality checks. Processors monitor moisture content, thickness, color, and flavor to ensure batch-to-batch consistency. If the puree is too thin, excess water is evaporated. If it’s too thick, small amounts of liquid bring it to the target range. The goal is a product dense enough to hold its shape on a spoon but smooth enough to blend easily into pie filling or batter. No sugar, spices, or preservatives are added to plain canned pumpkin; the ingredient list on a standard can is just pumpkin.
Filling and Sealing
The hot puree is pumped directly into cans on a high-speed filling line. Filling while the product is still hot serves two purposes: it reduces the chance of bacterial contamination during the transfer, and it begins creating a vacuum seal inside the can as the contents cool. Lids are crimped onto the filled cans immediately by automated seaming machines, creating an airtight seal.
Heat Sterilization
Sealed cans enter large industrial pressure cookers called retorts, which sterilize the contents at high temperatures. Pumpkin is a low-acid food, meaning it requires pressure canning rather than simple water-bath processing to eliminate the risk of botulism-causing bacteria. For reference, the USDA recommends home pressure canning of cubed pumpkin at 10 to 11 pounds of pressure for 55 minutes (pints) or 90 minutes (quarts), with higher pressures at higher elevations. Commercial retorts follow the same food safety principles but operate on a much larger scale, processing hundreds or thousands of cans per batch under precisely controlled time and temperature conditions.
After the retort cycle, the cans are cooled rapidly with water to stop the cooking process and prevent the puree from overcooking into a darker, caramelized product. The rapid cooling also helps set the vacuum seal.
Labeling and Distribution
Cooled cans pass through a final inspection, where automated systems check for dents, improper seals, or underweight fills. Accepted cans are labeled, packed into cases, and palletized for shipping. Because the retort process makes the product shelf-stable, canned pumpkin requires no refrigeration and typically carries a best-by date two to five years from production. Most of the year’s supply is processed during the fall harvest window and then distributed gradually to meet demand, which spikes dramatically in the weeks before Thanksgiving.
Beyond the Can: Other Pumpkin Products
Not all processed pumpkin ends up as puree. Some facilities produce pumpkin pie filling, which is puree blended with sugar, cinnamon, ginger, cloves, and other spices before canning. Pumpkin is also processed into frozen puree blocks for food service, dried pumpkin powder for baking mixes, and pumpkin seed oil pressed from the separated seeds. Each of these follows a different path after the initial cooking and pureeing stages, but the front end of the process (washing, cutting, seeding, cooking) remains largely the same across all pumpkin products.