If they are well-established by winter, they can remain in their container outdoors or be taken inside to a dark, unheated area such as a garage, shed, or unfinished basement. If left outside, move the container to a place that’s protected from wind. You’ll also want to make sure that they don’t get too wet when the snow (if there is snow) melts and spring arrives; pansies can make it through winter without issue, but then be killed by excessive moisture in spring.
If they are well-established by winter, they can remain in their container outdoors or be taken inside to a dark, unheated area such as a garage, shed, or unfinished basement. If left outside, move the container to a place that’s protected from wind. You’ll also want to make sure that they don’t get too wet when the snow (if there is snow) melts and spring arrives; pansies can make it through winter without issue, but then be killed by excessive moisture in spring.