Yes! Cold butter is essential when making biscuits. When the butter melts as you work it into the dough, it creates steam pockets that help create flaky layers in your homemade buttermilk biscuits. To ensure the butter is cold and ready to use, chill your cubed butter for at least 30 minutes prior to baking, but frozen is even better! Another thing to keep in mind is to not overwork the dough when adding the butter. This will cause the butter to get warm and then you are in the same place as if the butter was warm. There will be visible pieces of butter in the dough. That's ok, it should be that way.