• When possible, preserve fresh, locally-grown mushrooms for the best quality and nutritional value. 
  • Know when fresh mushrooms are available in your state with this seasonal food guide.

  • If this is your first time freezing or it has been awhile, it is recommended that you read General Freezing Information before beginning.  

1. Selection & Ingredients

  • Select firm mushrooms. Do not use mushrooms that show signs of decay or mold.
  • Lemon juice or citric acid 
  • Ice (approx. 1 pound/pound vegetables)

2. Equipment

  • Large cooking pot with lid
  • Colander
  • Cutting board
  • Knife
  • Use clean packing containers and materials that are moisture and vapor-proof/resistant:
  • Rigid containers (glass jars and hard plastic containers) are especially good for freezing foods with liquid. Covers for rigid containers should fit tightly.
    • Square or rectangular, straight-sided rigid plastic containers make the best use of freezer space.
    • Wide-mouth, dual-purpose glass jars made for canning and freezing are tempered to withstand extremes in temperature and allow for easier removal of partially-thawed foods.
    • Narrow-mouth dual-purpose glass jars can also be used but require greater headspace (to avoid expansion breakage at the shoulder) and foods must be completely thawed before removal.
  • Flexible bags or wrappings (plastic freezer bags, freezer paper or wrap, and heavyweight aluminum foil) are best for freezing food products with little or no liquid.
    • Vacuum packaging removes more oxygen than other freezing methods (Refer to manufacturer's instructions.)

3. Prepare Equipment

  • Before use, wash containers in hot soapy water and rinse well. Dry.

4. Prepare Vegetables

  • Thoroughly wash mushrooms. 
  • Sort for size.
  • Trim off ends of stems.
  • Slice or quarted mushrooms that are larger than 1 inch across.
  • Dip mushrooms  in a solution of 1 teaspoon lemon juice or 1 ½ teaspoons citric acid per pint of water.
  • Steam whole mushrooms 6 minutes; quarters or slices 4-4 ½ minutes.
  • Cool in ice water. Drain well.
  • Mushrooms may also be lightly sautéed in butter or margarine and cooled.

5. Pack

Dry Pack-

  • Pack tightly into containers, bags or wrap.
    • If using rigid containers, leave 1/2 inch headspace.
    • If using flexible bags or wrap, remove as much air as possible.
  • Make sure sealing edges are free of moisture or food.
  • Seal.

Tray Pack-

  • Place chilled, well-drained mushrooms in a single layer on shallow trays or pans.
  • Place in freezer until firm, then quickly transfer to labeled bags or containers. 
    • If using rigid containers, no headspace is necessary.
    • If using flexible bags or wrap, remove as much air as possible.
  • Seal.

6. Store

  • Label with the name of food, date, and type of pack.
  • Freeze as quickly as possible to 0°F or below.
    • For quickest freezing, place containers in single layers in freezer.
  • Most frozen vegetables will maintain high quality for 12-18 months at 0°F or below.