Late model or new cabbed 4x4 diesel tractor with FEL, SSQA and at least 2 rear remotes. I would go *at least* 30 hp, since you say "with some elevation". How much elevation are we talking about? You may want something with a turbo so you don't suffer a big hp hit from the thin air.
You may be ok with a front plow, if you have plenty of room to stack snow. The down side of *only* a plow, is if you DO run out of room for snow piles, you're kind of hosed. A rear snow blower will let you throw snow over the top and past the existing snow piles.
A block heater is obvious. But an oil pan heater and a hydraulic sump heater are the cat's backside when it's *our version* of cold. My tractor sits in an unheated shed, and spent it's first 3 years parked outside. Like you, it gets cold here (you may be colder, depending on how far up state you are) but it regularly gets -30 to -40F here. Those 3 heaters, block, pan, and hydro sump, will keep you tractoring along all winter. I have mine on a timer that comes on at about 4am, and turns off at about 10am. You'll also want to run synthetic oil.
If you're plowing/blowing snow on hills, or steep driveways, you will want rear chains for sure, possibly front chains if you're getting pushed sideways by the plow.
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Just another day...
At least at our new house, all my "stuff" can sit in an enclosed (yet unheated) building.