Why people stay in cold states during apocalypse?

Probably many people also tried that and many also probably succeeded, but it's also not without risk, they could run into (the territory of) any of the crazy groups of government nazis, competing militias, preppers gone crazy, religious fanatics, cannibals. All these little fiefdoms that are armed to the teeth, paranoid as hell and trying to share their resources with as little people as possible. And then the zombies. So there's probably also some merit in trying to stay. And they have way less population, so sure less resources, but also less competition.

I thought about that too. The expedition to a warmer place could be too dangerous and you don't know what's ahead. If you're in a place that has even some food and resources and is secure, it's probably best to stay put despite the harsh cold weather.