My understanding is lithium batteries will sustain no damage from sitting in below freezing temps. They will sustain damage if charged when they are below freezing. Therefore, an EV will heat the battery before charging if the battery is below freezing, and will avoid regenerative braking when the battery is below freezing. This is why the battery is heated. Not to avoid damage from sitting in the cold. (If I’m wrong about this, someone please link a source, but this was my research from lithium batteries when I bought one for an RV)

I’ve lived in north-central Illinois and south-central Wisconsin (current) most of my life. I’ve seen lows of below -10 °F at least once at least every winter. We set a new record at the Illinois/Wisconsin state line a few years ago, -29 °F. That was pretty cold.

My ICE cars cranked really slow when they’ve been sitting in -10 °F, but they start. As mentioned, nobody takes ICE batteries in at -10 °F, much less 10 °F. Except for vehicle not used, like lawn mowers and motorcycle in unheated garages, and only needed if you don’t have a battery tender to keep it charged. This is because lead acid batteries, fully charged, do not freeze until around -35 °F or so. Less when partially discharged. People where it regularly gets colder than this will have electric battery blankets to keep the 12 volt battery from freezing, since a 12 volt battery that freezes will likely crack the case which will ruin the battery. You’d also have crankcase heaters, maybe engine blankets. I’ve heard northern Canada has outlets at every parking space. Not for EVs, but to plug in the engine heaters when parked.

I just bought an EV and it will do what my other cars have done. Sit outside with no garage, take me to work and sit in the parking lot on days when the high is 0 °F (or less…), etc.

Bottom line: 10 °F is unpleasant. But it’s nothing for vehicles. Don’t worry about it. Cars have and will continue to operate in much colder climates than yours.