You need to keep your wits about you when driving up to the trailheads in the Zirkels. Many, if not most, of the access roads will take you through ranch lands with all sorts of branching dirt and gravel roads. But if you watch your map closely, and keep track of the intersections, you should have no problems. Just stay off the roads that say 4wd. And, even on the "good" roads, watch your speed. The roads can be narrow and winding.