It's horrible.
My experience riding in the snow in Tassie. (-2 to 0 degrees around upper Mt Wellington range and summit in middle of Winter, approx 4 hours of exploring).
If you wear bulky clothes to keep warm then you sweat, and get chills. If you wear leg warmers and a light breathable jacket they quickly get wet with slush from the front tyres and your whole body can't warm up (didn't have mud guards).
Descending at speed becomes terrifying as your fingers go so numb that you can't actually feel the brake levers (even with good gloves) and the only way you know they are working is the sensation of slowing down and looking at your hands to make sure your fingers are still wrapped around your grips properly. And having to stop every five minutes to un-cramp the fingers by sticking them down the front of your pants and warming them up. And the numb burning toes.
Ruts become invisible, and get ready to go over the bars, or fall over a lot on slippery tree roots, rocks and logs under wheel covered by snow. That stuff can go from tyre tread to bottom bracket deep in a bike length.
I had 2.1 tyres. Stupid.
I should have gone 2.4 with a low psi.
Rocks on some climbs will also be icy even though they look clean and slip when even the smallest amount of torque is applied.
Smashing parts of your body on things seems to hurt a million times more than normal.
It may look like blue skies on the ground, but once your'e up there it can turn to a freezing nightmare in five minutes. I tried descending in a snow dump and I will never do it again. Dangerous and stupid.
However, if you had good weather, weren't doing it solo, some super fat tyres, and some well groomed/not rocky/rooty/rutty trails, proper clothes, and not 0 degrees you could have a lot of fun.
Pointing out all the negatives here sorry. But I just remember getting home and jumping in a hot shower numb from head to toe thinking "Stupid stupid, never doing that again". Took two days to get the pins and needles out of my hands and feet.
Had I been prepared with the right gear, and with another rider it may have made all the difference to my experience.
As for the places you speak of, I cannot comment as I have never ridden there.