There's a dirt road all the way up to the top (no lookout there) that most cars could drive up. An easy drive, solo is no problem on the road.
A jeep trail comes in from the other side that is scary on a bike, and goes through a pretty gnarly rock garden. I have no idea of the routes to get to Qtz Mtn on the Jeep trail though because Andy and I haven't connected all the trails, and not really sure I want to after being beaten to death on the bike trying to run that section.
Not likely the area will be accessible until late June, early July due to the heavy snowfall this winter.
Andy and I go in from the Naches Side and sometimes end up on the Taneum side of the ridge.
Here's the best site for condition updates: