The Narrow canyons can get pretty icy in the winter months. The sun just never reaches down into the bottom of the canyons. So they are pretty much a March to May ride. Up on the top of the Swell, Copper Globe area, Justensen Flat, Head of Sinbad area, You can ride year round. But they are up around 7000 foot plus, So I've seen storms dump 2' of snow over night.
If you camp down by Goblin Vally and ride Chute Canyon area. You can jump across the highway and ride down into Robbers Roost with a short trailer ride.
My regular riding budy has moved back to Phoenix. So I'm looking for adventursom folks to go riding with. If you local here in Utah, want some company, My arm can be twisted.