Preserving winter squash and pumpkins

Turban squash.

Pumpkins and squash can be preserved for later use by freezing, canning or drying. They should have a hard rind and stringless mature pulp. Small size pumpkins (sugar or pie varieties) make better products.

Freezing

Freezing is the only safe method for preserving pumpkin purees, butters and preserves.

  • Select full-colored, mature pumpkins with fine texture.
  • Wash, cut into cooking-size sections and remove seeds.
  • Cook until soft in boiling water, in steam, in a pressure cooker or in an oven.
  • When soft, remove pulp from rind and mash.
  • To cool, place pan containing pumpkin in cold water and stir occasionally.
  • Pack into rigid containers leaving ½-inch headspace and freeze.

Freeze these items for up to 1 year. Frozen pumpkin or squash is great to use in pies, desserts and as a vegetable. Thaw pumpkin and squash in the refrigerator - not on the counter - before using.

Canning

The only safe instructions for canning pumpkin and winter squash are for cubed flesh in a pressure canner.

Caution: do not mash or puree! The density of this product prevents adequate heat transfer to the center of the jar and may allow harmful bacteria to survive.

To can pumpkin or squash:

  • Cut the flesh into 1-inch cubes.
  • Boil the cubes in water for 2 minutes.
  • Fill the jars with cubes and cooking liquid, leaving 1-inch of headspace.
  • Pumpkin and squash are low-acid vegetables and must be pressure canned. Process the vegetables at:
    • 11 pounds pressure in a dial gauge pressure canner.
    • Or 15 pounds pressure in a weighted-gauge pressure canner.
  • For either method, process pints for 55 minutes and quarts for 90 minutes.

To use canned pumpkin or squash, drain the jars, mash the cubes and re-heat.

Drying

  • Wash, peel and remove fibers and seeds from pumpkin or squash flesh.
  • Cut into small, thin strips, no more than 1 inch by 1/8 inch.
  • Blanch strips over steam for 3 minutes. Drain and pat dry.
  • Dry the strips in a dehydrator until brittle.
  • To reconstitute, use 1 cup of dried food to 2 cups of water.
  • Pre-soak for 1 hour and then boil until tender.

1 cup of dried pumpkin or squash is enough for one pie.

Pickling

Use pumpkin or squash in pickled products such as salsas, chutneys and relishes, but treat these products as fresh foods and refrigerate them. They cannot be safely canned by either the boiling water or pressure canning methods.

Butters and preserves

Refrigerate or freeze pumpkin butters and gelled preserves to ensure they will be safe to eat. Pumpkin butters and gelled preserves cannot be safely canned for room temperature storage.

Pumpkin and squash are low-acid foods and require special attention to preparation and processing. Currently, the USDA does not have any tested recipes for safely canning pumpkin preserves (jams, jellies, conserves or pumpkin butter).

Carol Ann Burtness, former Extension educator and Suzanne Driessen, Extension educator

Reviewed in 2018

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