If the pots didn't stay frozen solid for more than a few days, I'm sure they'll be fine. In the future, it is best to plant mint in the ground if you expect a hard freeze or bring the pots inside.
You can plant mint in a ceramic pot in the ground to prevent the spread of roots, to make the plant less invasive. Just be sure to check for runners too.
If the pots didn't stay frozen solid for more than a few days, I'm sure they'll be fine. In the future, it is best to plant mint in the ground if you expect a hard freeze or bring the pots inside.
You can plant mint in a ceramic pot in the ground to prevent the spread of roots, to make the plant less invasive. Just be sure to check for runners too.