Why Are Thanksgiving Pumpkins Often Orange?

An orange pumpkin makes an easy starting point for a Thanksgiving centerpiece. Set it beside a folded napkin or a bowl of fruit, and there is already something interesting on the table. But the familiar color raises a good question: why orange, when pumpkins also come in white, green, and gray?

The short answer is plant pigments. Carotenoids help produce the warm colors of orange pumpkins, while changes in green chlorophyll accompany the development of some fruits. The particular variety matters, too. There is no single color sequence that every pumpkin must follow. Research on pumpkin peel coloration shows how pigment amounts and their proportions contribute to different appearances.

What happens as a pumpkin changes color?

A green pumpkin contains chlorophyll, the pigment associated with the green color of plant tissues. As an orange-producing pumpkin develops, chlorophyll can break down and carotenoid pigments become more prominent. The resulting appearance depends on the pigments remaining and accumulating in the fruit.

Researchers comparing Atlantic Giant and Hubbard pumpkins connected their different colors with differences in carotenoid accumulation. They also described chlorophyll breakdown during the Hubbard fruit’s transition from green to orange. That makes maturity part of the explanation, rather than treating orange as a color the fruit simply receives when autumn arrives. The university-led study examined particular cultivars, so its findings should not be turned into a rule that every green pumpkin will eventually become orange.

Why varieties do not all look alike

Pumpkin color has a genetic component. Genes involved in making and breaking down pigments help influence what accumulates in the rind. In one study of two pumpkin lines, researchers observed different developmental paths: one changed from yellow toward red, while another developed a gray appearance with green stripes. Their analysis linked these differences to carotenoid and chlorophyll metabolism. The peel-color study illustrates why the variety’s characteristics belong in any explanation of its color.

There is another reason to expect variation: “pumpkin” is a common name covering several kinds of squash, rather than one narrowly defined species. Iowa State University Extension describes pumpkins within several species, including Cucurbita pepo, Cucurbita moschata, and Cucurbita maxima.

A naturally white pumpkin is therefore no botanical mistake. Iowa State lists white cultivars such as Lumina and Cotton Candy, and notes that white-skinned pumpkins can have orange flesh inside. The color you see across the table does not necessarily tell you what you will find beneath the rind.

Does deeper orange mean a better pie?

Color alone is a poor shopping shortcut for cooking. Two orange pumpkins may have quite different flesh. A large decorative pumpkin can be stringier and less flavorful than a variety selected for the kitchen. Chicago Botanic Garden’s selection guide recommends smaller pie pumpkins for their sweeter, firmer flesh.

Ask which variety the seller recommends for your recipe instead of choosing the brightest specimen. If you are buying only for a centerpiece, shape and surface texture can be just as interesting as color. The same botanical guide points to the range of ribbing, mottling, and other features available for decorating.

Orange also cannot certify that a pumpkin is safe to eat. How it has been handled matters. Nebraska Extension advises against cooking pumpkins that have already been carved and displayed, and says not to eat pumpkins treated with decorative floor wax or polyurethane. Keep food pumpkins separate from craft projects rather than relying on an attractive rind as reassurance.

Bringing the color story to the Thanksgiving table

For a simple arrangement, try one orange pumpkin with two smaller white ones. Or choose a single pumpkin with pronounced ribs and let its shape carry the display. These are design suggestions, not rules about which colors belong at Thanksgiving.

The science can become an easy conversation starter, too. Invite guests to compare the pumpkins’ colors and guess whether their interiors match. With children, ask them to draw the different shapes and shades they notice without cutting into the display.

An orange centerpiece offers a familiar look, but a mixed-color arrangement makes the variety easier to appreciate. Either way, the pumpkin’s appearance is a small, visible reminder of the plant biology behind the holiday table.