I have never had to contend with temperatures that low, thats brutal.
Also, ask the folks you know, there. They keep their cars own the road year round, don't they? So they know about antifreeze.
To put it up for winter, if you have antifreeze in it which is good to -80 or lower, then just make sure you have fresh in it when you put it up.
If you aren't on synthetic oil yet, get on it, and put fresh in before you put it up.
Make sure all your hydraulic fluid is filled to the lines.
Clean the chain, wax it, do the normal stuff.
Put the battery on a float charger (e.g., Battery Tender Plus or Jr.) and you should be good to go.
Back in the 1970s I kept a Kawasaki H1 (and later, a H2) in the barn at my girlfriend's parents farm near West Point, NY and Newburgh, NY. It didn't get -60 there, but it got -10 at times when the wind whipped across the fields, and all I did was have my girlfriend start it every day after school and let it run 15 minutes. It was fine.
And yes, while I was at West Point I was dating a 16 year old girl who was still in high school. My only mistake, the worst I ever made in my life, was not marrying her. We'd be riding together today if I had. She loved my motorcycles, and used to ride the H1 around on the farm and county roads when ever she could get away with it.
Living the Gypsy Life