Thinking about Adventure Cycling's cross-country bike trails. I'm kicking around the idea of doing one of these during the winter.

Anyone have experience doing the Northern Tier route in winter?

I am very experienced cycling and camping in sub-zero conditions, but I can't bike on a highway with a shoulder full of snow. I'm trying to gauge what kind of roads I'd be on during a route like this to decide if it's foolish to attempt (I can wait until spring, but a mid-winter "Northern Tier" adventure sounds grand to me)

Thanks for any and all info,
Max

Edit: I know several roads close for the winter. Not sure if there's workarounds.