This brings back memories!
When I lived in the North country the bike (s) were inside the house or basement more winters than not. It's a great time to bond with your machine. If you can walk through the door, every piece of the bike will fit. Of course if you are fortunate to have a garage that is or can be heated, that is better. All tools are readily available and you can start it when you want. Starting a bike in the house did cross a threshold, but didn't stop the habit.