The development of the fat bike (about 4 or 5 inch low pressure tires) has been a huge boon for human powered access to trails of snow and ice in the north. Least readers think that this is only for the youth. There are a lot of grey haired folks in my age demographic that are out there on these bikes. Ross Raven has discussed the post-apocalypse side of such biking.
In our area, the fat bikes are really mostly used for recreation with high status and ridiculous costly versions with lots of titanium and carbon. As a company, Surly has always been the people's bike and really the first mass producer of the fat bike. Surly is apparently overstocked on current complete fatbikes. The prices are pretty good for a rock solid bike with reliable components. If you're in the market for a steel frame fat bike, this might work out for you. It could also put a little pressure on the used market that has demanded really high prices in IMHO.
http://surlybikes.com/blog/post/get_em_while_theyre_fat
Buying a more affordable bike also allows budgeting for add ons that can make riding a pleasant experience. With the availability of studded tires (Dillinger N45) this has made a very reliable form of winter commuting possible and allows access to many areas with pure ice. Before these tires, there was nothing good about being on ice with a snow bike--it was a trip to the orthopedist waiting to happen! With them, the hard thing is remembering how slick it will be when you get off. My dear husband put the studded tires on my older Pugsley but seems to "borrow" this bike quite often for riding on the steep single track trails with friends.
Fat bikes are not just for winter. With the improved tire patterns (Surly's Nate are an example), riding on soft muddy trails churned by ATVs or crossing streams is a lot easier. The fat tires seem to do less harm than boots most of the time. Land managers have their own ideas about this but the pressure in the tires can be pretty low. The gearing is also set up for tough conditions. You can also just pick up the bike and carry it which is easier than with an ATV. For hunting or foraging, large paniers can be added, and the bike can be surprisingly silent. At worst, it may become a push cart if loaded down. I wouldn't want to carry out a moose but a deer or caribou is pretty feasible with a few bikes. Finding a way to comfortably and safely carry a rifle can be more challenging on the bike.
I have no commercial ties to Surly

, and I would grab one of those high end bikes in a second if a good deal came along on a used one. However, this Surly offer may be a way for some readers to gain access to a bike that has been a pretty useful tool and will go places that a traditional mountain bike will not, albeit at a more stately pace but not nearly as slow as you might guess when you first see them.