Ok, not far enough north for dipstick heaters.

Oil gets very viscous on sub zero weather. A long time ago, I visited
in eastern Quebec (north of northernmost Maine) in February. The hotel
had outlets at every outdoor parking spot, and every car that drove in
had a extension cord hanging out over the radiator. Plug the cord
into the outlet and oil temps stayed above freezing. Seemed like when
the weather warmed up to 0, it would snow. Most of that week, it stayed
below -20F

I grew up in NW Minnesota not far from the Canadian border and when I
was a kid we always plugged our car in at night if it was outside.
But, I don't remember doing that if the car was in a garage. Don't
remember seeing the block heaters around SE MN or WI, though.