My piggies are all outside in their gazebo & got thru last winter ok. They have pigloos, lots of hay to bed in & i cover their hutches, last year it was carpet (since thrown it) this year i got some new ring top wool curtains cheap so they've got them to keep them warm & each other of course
Guinea pigs need to be indoors or at least in a shed for the winter. So many piggies kept outside did not survive last winter :'(
They are from a climate very different from ours and can not cope with the cold or the damp. From about mid Novemeber until late March or April they need to be out of the weather. There are a number of ways to provide them with indoor acoomodation that will provide them with adequete space without confining them to small inadequete cages. Storage subes or dog crates are two of these. Or they can have a warm box on a shed or conservatory floor.