Can be snow-covered, December through March.
Bender Creek is a motorcycle trail that has seen some love from mountain bikers over the years. It has a number of whoop-dee-doos and berms, which have been burned in by motorcycles and are fun to rip on a mountain bike. The area recently burned and is open to mountain bikes, but currently closed to motorized users, so it is nice and quiet out there.
The trail can be loose in the fall and there are some deep water crossings in the spring, but that is part of the fun. That said, be prepared to get your feet a little wet as you rip down this singletrack trail through the mountains.
There are lots of connector trails nearby that can be used to make this ride into a loop.