I live at 7200'. February before last, we saw -25 degrees. Even my parked outside 4runner with the 7 yr old battery started. In fact, the only folks that had any issues with with a vehicle starting had diesels.......Without block heaters.
If you are worried about it, you can heat the entire underhood (Presuming inside parking) with simple heater based on a 200 watt light bulb, old style porcelain base mounted on a piece of wood, on the floor under the engine compartment. If you really want to get fancy, use a piece of stovepipe to make a "Stove" around the light bulb. If you get it the right height, you won't even have to move it to drive off.
If you are worried about it, you can heat the entire underhood (Presuming inside parking) with simple heater based on a 200 watt light bulb, old style porcelain base mounted on a piece of wood, on the floor under the engine compartment. If you really want to get fancy, use a piece of stovepipe to make a "Stove" around the light bulb. If you get it the right height, you won't even have to move it to drive off.
