The Underdown ski trails have tracks set. Snowshoe trails are well established to the Big Bog and fair to Dog Lake. I rode a regular bike with 2.2" studs and did some hiking up hills, but it wasn't terrible. There are rumors of wolves around Mist Lake. I don't know about that, but there were some canine tracks around Dog Lake tonight that couldn't be explained any other way.
The Beaver Trail area in Harrison Hills will be a bit rough on a fat bike, but a worthwhile challenge. I'll try Bradley Park tomorrow.