Inside an unheated pole building. one has power the other dosnt. still better than outside
My L3400 is in a unheated pole barn. I do have a concrete floor and power. I hope to heat and insulate it in a year or so.
My 8N has sat outside for at least the past 25 years. If it's going to be parked for an extended period it gets a tarp over it. Otherwise just flip the seat over backwards. Of course, it's just an ugly old farm tractor that gets run through the woods every now and then.
When not used my tractor stays in a heated garage with thermostat set to 40 degrees F. All my implements are inside too.
As long as you have power to plug in a Battery Tender Jr and a roof, your tractor should have all it needs.
I keep my Allis B project in the garage, right now behind the 3/4 project. I hand crank it and it always starts fine. My International 434 Diesel stays outside for the most part. It gets fairly cold quite often up here, down to -20 degrees celcius and lower quite often. It will usually start with the glow plugs and a few minutes work, but we usually use the block heater, its way easier. My soon to be John Deere 50 and 8N ford (as soon as grandparents decide to move to town), have been outside since at least the mid 70's, a few issues, like the distributor filling with water once a short while ago, but they almost always have started. Recently the Deere has been inside for the winter and it starts way easier in the cold.