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How to Store Harvest, Cure, and Store Winter Squash

Winter squash curing on rack

winter squashesHarvest winter squashes when they are mature. Winter squash is mature when its rind cannot be scratched with a thumbnail.

Winter squashes include Acorn, Butternut, Hubbard, Banana, Buttercup, Spaghetti, and pumpkins.

Winter squash refers to squash planted in spring, grown in summer, harvested in fall, and stored for winter use. Winter squashes require more days to reach maturity than summer squash. Winter squashes store well while summer squashes do not.

When to Harvest Winter Squash

  • Winter squash is ready for harvest when the rind is hard and is difficult to scratch with a fingernail. The skin of mature squash will be dull and dry looking; immature squash will have a bright skin with a sheen.
  • Harvest winter squash before nighttime temperatures dip into the 40°s F and before the first frost.
  • Squash harvested after frost will be sweeter but will not store as long as squash harvested before frost.
Butternut squash
Cut the squash away from the vine cleanly with a pruner or lopper.

How to Harvest Winter Squash

  • Cut the squash away from the vine cleanly with a pruner or lopper.
  • Leave a 2- to 4-inch stem to cure with the squash. Ripping fruit from the vine can leave a wound that can turn to rot.

How to Prepare Winter Squash for Curing

  • Squash with a broken or loose stem will not store well. The exception is Hubbard-type squash which stores best with the stem completely removed.
  • Clean squash for storage with a dry towel; remove dirt and debris and any blossom that remains on the squash.
  • Don’t use water to clean the skin of the squash. Keep the squash dry. Do not handle or harvest wet fruit.
  • Cure and store only blemish-free squash; do not cure squash that is bruised or punctured or deeply cut. Curing can help heal minor cuts and scratches.
  • Slightly immature squash can be cured but it best to harvest and cure mature squash.
cure winter squash
Butternut, Kabocha and Hubbard curing.

How to Cure Winter Squash

  • Winter squash when harvested must be prepared for storage. Preparation is simple—called curing—and requires little effort. Curing is essential for the long storage of winter squash.
  • Curing—a form of drying—allows excess moisture in the squash to simply evaporate and slows the fruit’s respiration rate; both are important for long-term storage.
  • As water evaporates from the squash, natural sugars are concentrated and the squash becomes sweeter tasting.
  • Curing also causes the skin or rind of winter squash to become harder. Hard skin slows respiration, helps the stored squash resist rot and collapse, and allows long storage.
  • Cure squash and pumpkins for 10 days at temperatures between 80°F and 85°F and relative humidity of 80 to 85 percent.
  • Curing winter squash requires about 10 to 14 days of simply letting the squash sit in a warm place with good air circulation. To cure winter squash set it on an elevated rack or mesh frame—chicken wire stretched across a frame or a window screen will do—and let the air circulate. Keep the squash dry during curing.
  • Winter squashes that require curing include Blue Hubbard, Buttercup, Butternut, and Spaghetti. Acorn squash is a winter squash that should not be cured; curing Acorn squash will reduce its storage life and quality.
  • If squash can not be cured outdoors, use a small cabinet with a thermostatically controlled electric heater or set squash in a warm shed or garage with a small fan to maintain good air circulation.

How to Store Winter Squash

  • Store winter squash in a cool, dry place; store winter squash at 50° to 55° F with a relative humidity of 50 to 70 percent—higher humidity can result in rot.
  • Store cured squash on a shelf or rack, not on the floor.
  • Keep the skins of cured squash dry to prevent the growth of fungi and bacteria.
  • Do not store squash near apples, pears, or other ripening fruit. Ethylene gas released from ripening fruit can cause the squash to yellow and eventually rot.
  • Wiping the skin of winter squash for storage with 1 part household bleach in 10 parts of water can slow the growth of microorganisms that can cause rot.
  • Inspect stored winter squash weekly. Squash that starts to spot should be moved away from other stored squash and used as soon as possible. Skin spotting can be a sign of rot setting in.
Acorn squash
Acorn squash

Storage Life of Winter Squashes

The storage life of winter squashes is:

  • Acorn and spaghetti squash, about 1 month. The skin of Acorn-type squashes stored longer than 1 to 2 months will become yellow and the flesh stringy.
  • Butternut, 2 to 3 months.
  • Hubbard types, 3 to 6 months.
  • Banana, 3 to 6 months.
  • Buttercup or turban types, 3 to 6 months.
  • Jack O’ Lantern and Connecticut field pumpkins can be stored 2 to 3 months.

Also of interest:

How to Harvest and Store Summer Squash

How to Grow Winter Squash

 

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21 Comments

    • Optimal curing temperatures are mentioned in the post. Choose a spot that is dry with good air circulation–a garden shed, garage, porch. Avoid wet and humid locations and avoid direct sunlight. Set the squash on a wooden or metal rack so that the air circulates from all sides.

    • One key element of storing winter squash is making sure the squash cure (skins harden) before you place them in storage. To cure the squash set then in a place where it is warm, shady, and plenty of air circulation. There should be space between each squash during the curing time. The squash should cure in about 14 days. After the squash have cured you can store them in a dry, cool place and use straw as a cushion between the squash.

  1. In the photo there is a squash that is oblong and green/striped in the top row in the middle. What is the name of that one specifically.

  2. I have some butternut squash I have just placed in my basement about a week ago and noticed that the stems have a white mold on them. Should I remove the stems? Is the squash still okay?

    • Leave 1 inch of stem attached to winter squash when storing. Be sure the squash has cured in a dry, well-ventilated place before placing it in storage. Stems should be dry and corky when you place the squash in storage. If the squash is not cured it will develop mold and rot.

      • I’m having the same problem as Sandra. Just bought a 50 lb bag and it filled the car, now my kitchen with an unpleasant mildew smell and the tops of the inch long dry stems have white mildew. What can we do to save this squash?

        • If you are growing in containers you may have to purchase soil that has been pasteurized or heat-treated to kill pathogens. Overwatering can result in mildewed soil; allow the soil surface to dry between waterings; use a moisture meter to know how moist the soil is below the surface. If the stems are dry and the leaves are mildewed you can spray with a fungicide to help control the mildew. If the seedling continues to decline, it’s best to sow new seed or set out new transplants.

  3. Can you eat hubbard squash that has greenish flesh? It is really big, but grew around a stair well! Also Some of my spaghetti squash have a beined/greeny look to them, even after 2 week of warm curing indoors. Are they good to eat? Most of my spaghetti squash turned the classic golden color.

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