When Do Pumpkins Turn Orange? A Morning Walk Through the Patch

There is a pumpkin at the far end of the third row that was solid green on Friday. This morning there is a patch of dull apricot on its shoulder, about the size of my palm, where it has been leaning into the sun. That first blush always catches me off guard, even after all these seasons. So: when do pumpkins turn orange? The short answer is that they turn in the last few weeks before full maturity, and the color arrives from the inside out, not from the sun beating down on the rind.

I walked the rows slowly with the coffee going cold in my hand, which is how most useful garden thinking happens around here.

When Do Pumpkins Turn Orange on the Vine?

Most orange varieties start to show color somewhere in the last two to four weeks of their growing window. If a variety is listed at 100 days to maturity, you are usually looking for the first blush somewhere around day 80 to 90. The fruit has already reached close to its full size by then. What happens next is chemistry rather than growth.

The green in a young pumpkin is chlorophyll. As the fruit finishes, the plant stops maintaining it, and the chlorophyll breaks down. Underneath it, the carotenoids were there the whole time, waiting. The orange does not arrive so much as it gets uncovered. That is why a pumpkin colors up unevenly, why the shaded underside lags behind the shoulder, and why turning a fruit gently on its base can even things out over a week or so.

Cool nights speed it along. A stressed vine will sometimes push color early, which looks like good news and usually is not, because the fruit inside may not have finished packing on sugar. Color and ripeness travel together most of the time, but they are not the same thing. For the fuller set of cues, the rind test and the stem test and all the rest, our guide on when to harvest pumpkins and winter squash walks through what to check before you cut anything.

Will a Green Pumpkin Turn Orange After You Pick It?

This is the question I get most in September, usually from someone eyeing a frost forecast. The honest answer has a condition attached to it.

A pumpkin that has already started to blush, and whose rind has hardened enough that your thumbnail will not dent it, will keep coloring after you pick it. Set it somewhere warm and bright, out of direct rain, and it will carry on for another week or two. That process is real and it works.

A pumpkin that is still entirely green, with a soft rind and a green juicy stem, is a different story. It may fade toward a pale yellow, but it will not develop into a proper deep orange, and more to the point it will not store. The sugars and the cell walls that let a squash sit on a shelf until February are laid down on the vine, not after. If frost is genuinely coming, pick it anyway and eat it soon rather than lose it. Just do not expect it to keep. If storage is what you are after, our notes on how long pumpkins last by variety are worth a look before you decide what goes in the cellar and what goes in the kitchen this week.

Not Every Pumpkin Is Meant to Turn Orange

Here is the part that trips people up, and it took me a couple of seasons to stop worrying about it myself. A good share of what we grow never turns orange at all, and there is nothing wrong with any of it.

Long Island Cheese ripens to a soft buff tan, the color of an old wheel of cheese, which is exactly where the name came from. Jarrahdale goes a slate blue and stays there. Black Futsu starts nearly black and matures to a dusty bronze. Some of the best pie flesh in the patch sits behind a rind that never once goes orange. If you are growing for the kitchen rather than the porch, the pie pumpkin seeds we keep are chosen for what happens under the skin.

So before you worry about a pumpkin that is refusing to color, check what it is supposed to look like when it is done. Half the panic in September is somebody waiting on orange from a squash that was never going to give it.

The Slow Part Is the Point

What I keep coming back to is how little any of this can be hurried. You can feed the soil, keep the vine healthy, mulch under the fruit, and then the plant takes its own time. The color change is the vine finishing a piece of work it started back in July, and no amount of standing over it helps.

So when do pumpkins turn orange? When the plant is done, and not one day sooner. I find that steadying, most mornings. There is a fruit out there quietly converting starch to sugar while I am inside refilling the cup, and by the time the light goes long and gold in October it will be ready, whether or not I paid attention on any particular Tuesday.

Go look at yours this week. There is probably more color on them than there was on Friday.

From the patch in Newton, Kansas.