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THE BREADBOARD GUIDES

How to freeze sliced sourdough for toast and sandwiches

One loaf on Sunday. Toast on Thursday. The trick is deciding how you will eat it before it goes into the freezer.

Slice now or freeze the whole loaf?

If everyone will sit down to the same loaf, freezing it whole saves the job of separating slices. If one person wants toast most mornings, portioning the cooled loaf first means you can leave tomorrow’s breakfast in the freezer. For sandwiches, make pairs from neighbouring slices so the two halves match.

Pack it for the breakfast you actually eat

  1. Let the loaf cool. Use your recipe’s cooling guidance before you slice. A warm crumb can compress beneath the blade. If it still squashes when cool, try the slicing troubleshooting guide.
  2. Choose the portion. Cut slices at a thickness that suits your usual sandwich or toaster. Separate single slices, or pairs that you expect to use together, with pieces of baking parchment.
  3. Wrap the portions airtight. Mark the pack with the bread and date. If your bakes look alike in the freezer, add a practical note such as “thin sandwich pairs” or “thick weekend toast”.

When you want a slice

Take out the portion you intend to eat. For a soft sandwich, leave the slices to thaw before filling. For toast, King Arthur Baking recommends reheating individual slices straight from frozen in a suitable toaster or toaster oven. Follow the appliance instructions and make sure the slice fits the slot.

Two things to change on the next loaf

The whole stack stuck together.
Use parchment between portions before packing. That way you can lift out a pair without trying to separate a solid frozen loaf with a knife.
Each slice is the wrong thickness for breakfast.
Cut one sample from the cooled loaf first. Compare it with the thickness you normally eat before slicing the rest.

Already have a knife that slices cooled bread well? Use it. If the frame gets in the way of the cut, measure your loaf against its opening before shopping.

Further reading: King Arthur Baking’s sourdough storage guide and guide to defrosting bread.

By Mike Turnham · Updated 4 November 2026 · Independent guidance, not hands-on product testing. How we choose