Unless you are growing them indoors, they will go dormant:-) Since most strawberries are more evergreen than not, especially in mild winter climates, the die off of any foliage is not a clear indication of dormancy.

It rarely gets below freezing here and strawberries are almost fully evergreen but they still enter a dormant state when the days shorten and the weather cools. Dormancy is just a lack of any active growth.

I grew strawberries in Maryland, so some of our winters were just like yours (that polar vortex!) and some were milder, more like in the South. I would usually mulch them heavily with straw after the first hard freeze and they stayed mulched all winter. They were dormant but green all winter under that straw and, sometimes, snow on top. So no worries. Even if they are a bit light-deprived by the end of winter, a day in the sun will fix it right away.

Thanks!