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Lots of places in the US have bans on fires though some are seasonal. You can't build a fire above 5000 ft in much of the cascade and olympic mountain range because the small alpine trees can't stand up to wood gathering.

Many national parks and forest either restrict fires to metal fire rings or ban them out right during the height of wild fire season and, in southern California, some of these bands are now year long as wildfires can be so catastrophic.

Warm clothing and sleeping bags works well for heat, never had an issue with beasts other then bugs (head nets work for that) and i've spent a lot of time camping in remote spots populated with bears, wolves, mountain lions etc.