Can a guinea pig live outside through winter? It depends on the temperature during your winter time.
If the temperature is mild during your winter time, then they will be fine living outside.
Can a guinea pig live outside through winter?
However, if it is bitterly cold during your winter time then they must be brought inside or into some kind of shelter or outhouse at least.
This will bring them out any bitter wind or snow that will affect them.
They will feel cold if it drops severely.
If you are in doubt about whether to bring them in or whether to leave them outside, it is always better to bring them inside.