Soon this hard freeze will pass, the snow melt off, and the damage revealed. Water that gets into tiny cracks or holes in the clay pot's walls expands and breaks the bonding of clay particles. When the ice melts, the cracks enlarge and the pot dies. I throw it away and try again.
It matters how the pot is shaped. If water can move while expanding to ice, the pressure on the pot walls is less. If the pot tapers and the water is trapped, then freezes, the pot is toast (in a manner of speaking.)
Once this hard freeze passes and the snow melts off, I will discover how many pots I have lost. This has been the hardest freeze around here in the last eleven years.
Here's a picture of a pot that did not make it through our last hard freeze:
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