As you test out new varieties of storage vegetables for your home garden, you’ll benefit from learning when to harvest acorn squash. These winter squashes get their name from their acorn shape. They’re close cousins to Hubbard, pumpkins, buttercup, kabocha, delicata, spaghetti squash, and butternut squash. Here, I offer advice for growing acorn squash, indicators of squash maturity, how and when to harvest acorn squash, and all-important storage tips.

Harvesting acorn squash is a straightforward task. Winter squash of all kinds are harvested and eaten as mature fruit, when the skin has hardened into a tough rind. Determining when to harvest acorn squash is important to its flavor and texture as well as to its shelf life. The best thing about acorn squash is they’re easy: With a reasonable amount of care throughout the growing season—and no curing period—you can add sweet, nutty acorn squash to your recipes throughout the fall.

Growing acorn squash

There are a few things to know to grow acorn squash successfully:

• Winter squash of all types are warm-season annual plants. Depending on the variety you choose, acorn squash could take 80-100 days to mature. Table Queen acorns, for example, mature in 80 days. Plan accordingly so the plants have time to ripen before your first frost in the fall. Make note of this timeline, as this will be a factor in when to harvest acorn squash.
• After danger of frost has passed in the spring, direct-seed acorn squash plants into the garden in full sun. You can start them indoors ahead of time, but the roots don’t like to be disturbed. Often, acorn squash transplanted as seedlings will end up maturing at the same time as direct-seeded plants due to transplant shock.
• Space seeds every 3 to 4 feet in rows 6 to 8 feet apart. Read the seed packet for exact spacing for your variety.
• Acorn squash will grow best in well-draining, moderately fertile soil. Amend the soil with whatever your soil test says it needs before planting.
• Keep the area weeded early on. As the vines grow—as long as 20 feet!—the large leaves will shade out the weeds later in the season.
• You can grow an acorn squash plant on a sturdy trellis, if horizontal space is at a premium in your vegetable gardens. The heavy fruits will need support with a net or sling.
• Acorn squash flesh is succulent and full of moisture. These plants require regular watering to grow, especially during hot, dry weather and when fruits start to form.

Signs of ripeness

At maturity, acorn squash are usually 5 to 8 inches long and 4 to 5 inches across. This may depend on the variety you choose and the crop’s growing conditions. Their rind is ridged and develops a deep green color with a yellow-gold to dark-orange spot on the bottom side when ripe. This coloration is an important indicator of when to harvest acorn squash.

When to harvest acorn squash

Pay attention to when you planted so you can have a better idea of when to harvest acorn squash. Unlike zucchini and summer squashes, the acorn squash harvest happens all at once. You want to leave them on the vine until they’re fully mature, following the change in coloration.

The density of the rind is another indicator of ripeness. Try pressing your fingernail into the rind. If it penetrates it easily, the fruit is not ready to harvest. When piercing the rind with your fingernail is challenging, it’s time to harvest.

Typically, gardeners will allow their winter squash to stay in the garden until September or October, when heavy frosts arrive. As the vine dies back and turns brown, the squash stops receiving nutrients and won’t grow any larger. Go ahead and harvest at this time, regardless of other signs of ripeness, to prevent pest and weather damage.

Watch me harvest my winter squash and get tips for making the cut in this quick video:

How to harvest acorn squash

After you’ve determined when to harvest acorn squash, do so using a sharp knife or pruning shears. Cut the ripe acorn squash from the plant, leaving about 1 inch of stem attached. This stem seals off the squash’s sensitive stem-end from the rest of the world.
Handle with care to avoid cutting or bruising the squash. Any damage will shorten its storage time.

What to do after picking acorn squash

Use a cloth to wipe dirt away from the squash, but avoid washing with water. You want the squash to be dry before storage.
Most winter squash types need to be cured after harvest—not so with acorn squash. The high temperature and humidity required to cure squash actually reduces the quality and storage life of acorn varieties. Come time to harvest winter squash, the acorn squash can go straight into storage.

Storing acorn squash

Even though you aren’t curing your acorn squash alongside your other winter varieties, you can store all types together. Acorn squash keep best in a dry area, 50° to 55°F. This may be a root cellar, basement, or exterior closet. Don’t let your winter squash freeze! And don’t put them in the refrigerator until you’ve cut them open.

Keep the squash in a single layer, when possible, in case one of them begins to rot. A little bit of separation will help avoid spreading any issues between the squash.

If you’re keeping winter squash in an area with other fruits and vegetables, avoid putting them with apples, pears, and tomatoes. The ethylene these fruits emit will shorten an acorn squash’s shelf life.

How long do acorn squash last?

Acorn squash are not among the hardiest winter squash keepers. Under the right conditions, they’ll last 2 or so months in storage.
Any acorn squash with soft spots or other significant imperfections should be eaten sooner than perfectly intact fruits.
If you find your squashes are going bad before you can use them all, you have options. It’s possible to roast, purée, and freeze or can acorn squash to use as a pumpkin or sweet potato substitute as well as for use in baking, soups, or side dishes. A little creativity means you won’t waste a bite!

More tips for success

One of the easiest ways to lose the acorn squash you’ve worked so hard to grow is to have to share them with common pests, including vine borers and squash bugs. Row covers offer great protection from bugs trying to lay eggs on the plants and from pests trying to eat sensitive new growth. Be sure to remove the row cover when the squash flowers begin opening so pollination can take place. Without pollination, you’ll have a different set of crop challenges, including immature fruit and poor fruit set.

Be a harvesting hero

After a season or two of growing this winter squash favorite, knowing when to harvest acorn squash will come easily for you. The telltale yellow-to-orange spot, a thick rind, and a knowledge of the days to maturity for each variety are all you’ll need to bring in this harvest on time every year. After the harvest, your acorn squash are ready to eat, with no more patience needed to wait out the curing period after a long growing season.

What will your first homegrown acorn squash dish be this season: a savory squash with a sausage-breadcrumb stuffing, or a sweet roasted dessert squash with butter and brown sugar? In my house, we’ll probably be making both.

For more information on growing different types of squash, please visit these articles:

• Growing spaghetti squash
• Round zucchini varieties
• Harvesting winter squash
• Combatting squash bugs
• How to freeze squash
• Powdery mildew management