This area is groomed by the Bitterroot Cross Country Ski Club. The trails are easy to difficult, well marked and user friendly. There is a beautiful warming hut/cabin at the convergence of many trails, always manned by happy hosts. Free, donations accepted.
The trails are kept in great shape with a nice warming lodge, well marked maps, and beautiful overlooks. Looks like Narnia. You can't rent equipment here so make sure to bring it with.
Very nice trail system for the area. Great snow, well maintained trails and a nice warming hut. Not as an extensive trail system as West Yellowstone, but pretty good.