So, you planted pumpkins a few months ago and they look big enough to pick, but are they actually ready?
Unlike summer squash, which can be harvested at any stage, pumpkins and other winter squashes typically need 90 to 120 days to mature, depending on the variety and growing conditions. Some miniature and early-maturing types can be ready in just 75 days, while large carving pumpkins might take up to 150 days to fully mature.
That means the seeds you sowed in spring won’t yield ripe pumpkins until the end of summer, and harvesting too soon can leave you with watery, underdeveloped squash with little flavor.
Pumpkins need to stay on the vine as long as possible to accumulate sugars and carbohydrates, which make the flesh denser, softer, and sweeter. But you also don’t want to leave them on the vine for too long, as that can lead to mealy flesh.
So is there a telltale sign that your pumpkins are prime for picking? Yes—actually five signs that never fail for me (and why the pumpkin knock test rarely works).
1. Passes the fingernail check
The fingernail check is probably the most reliable indicator of ripeness and one I use most. It reveals whether the skin (rind) has hardened properly.
If you press your thumbnail firmly into the skin and it resists a puncture, the pumpkin is ripe and ready. Your nail might leave a tiny dent, but it shouldn’t penetrate the skin.
2. Color and texture change
Pumpkins undergo a change in color as they get closer to maturity. Classic carving pumpkins usually start out as bright Crayola orange before deepening to a rich autumnal shade.
Certain heirloom types, however, never turn orange at all, so you need to know what color your pumpkin is supposed to be: ‘Seminole’ ripens to a matte, tan finish, ‘Jarrahdale’ turns a gorgeous sage green, ‘Musquee de Provence’ matures to a peach or caramel color.
Sometimes, the change is more subtle: You might notice the glossy sheen on your pumpkin giving way to a duller tone.
Then there’s the oddballs. Some specialty varieties (like the Super Freak line of warty pumpkins and my personal favorite, ‘Galeux d’Eysines,’ also known as the peanut pumpkin) are bred to exhibit bumps and “warts” at maturity, so once they start looking all ghoulish, it’s a good sign they’re ready to decorate your front porch.
(If you didn’t intentionally grow a warty pumpkin, however, those lesions may indicate bacterial or viral infections, pest damage, or edema.)
‘Black Futsu’ (a Japanese heirloom pumpkin) is a great example of all this, starting out as a glossy dark green and maturing to a dull, dusty-looking gray with yellow splotches and more pronounced bumps and ridges.
It’s actually quite the chameleon, as it transforms again while it cures and settles into a dull grayish-orange tone. (Read more about growing ‘Black Futsu’ pumpkins.)
3. Woody stem
You may have noticed the stems and vines on a pumpkin plant are all hollow. But as a pumpkin matures, the stem closes up and becomes tough and woody because the vine stops sending nutrients to the fruit, effectively sealing the connection.
Check your pumpkin by wiggling the stem a bit. It should be stiff and brittle, and maybe already turning brown. If it’s still green and spongy, it needs more time on the vine.
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4. Brown tendrils
Next, look just past the stem to the tendril closest to the fruit. Is it turning yellow or brown, or looking dried up? This is typically one of the first parts of the plant to die back when the pumpkin matures, indicating the plant has finished supporting the pumpkin.
5. Plant is starting to die back
Between early September to mid October, the most obvious sign that your pumpkins are ripe and ready is a plant that looks like it’s on its way out. If you haven’t had frost but the leaves are yellowing and starting to die back (and you’re within the 90- to 120-day maturity window for your particular variety), the plant has likely given its all.
Do a final fingernail check (see my first tip above) to ensure the rind is nice and hard, then cut the pumpkin from the vine. Be sure to leave at least 3 inches of stem on the pumpkin—this is your “cork,” effectively keeping bugs and bacteria out and protecting your pumpkin against rot and disease.
Pumpkins can be used (or eaten) right away, but if you want to maximize their shelf life so they’ll hold through winter in your pantry, take a little extra time to cure them. I lay out the simple process in my guide to curing pumpkins.
Is the pumpkin knock test a good indicator of maturity?
It’s one indicator, but not a reliable one. In theory, you should be able to give a good knock on the rind and hear a hollow sound, which means your pumpkin is ripe. That’s because as it matures and becomes more concentrated in flavor, internal moisture content decreases. The rind also hardens, further reducing the rate of respiration and moisture loss.
This thickened rind is why I don’t recommend the pumpkin knock test as your sole indicator of maturity. Rind thickness varies a lot between varieties and sizes, so the sound you’re listening for varies as well.
A ripe, thin-skinned carving pumpkin will have a very different sound from a thicker-skinned pie pumpkin that’s also ripe. And if a pumpkin has a smaller core of seeds, that hollow sound (or is it a solid thud?) is harder to hear. (Fun fact: A pumpkin with a rotting core may also sound hollow, so there’s that.)
Go ahead and use the knock test as your first check, but the other signs I mentioned above are far easier to discern.
