Yes, that is frost

And it's on the inside of the front door. We have to use the front door and the kitchen door, because the basement door is frozen shut.

It's -14F/-25C right now. School was cancelled so the spousal unit is outside (brrrr!) with the dogs and the snow shovel. It didn't help that my youngest brother, who is a kept man in California, sent us a snarky email last night comparing the relative temperatures.