Attempted to go to the upper trailhead Monday, September 19, 2016 in a stock 2016 Jeep Cherokee 4x4. Had to turn back within ½ mile. Ruts were too deep to manage. Only one vehicle was at upper trailhead ... a Jeep Wrangler with a serious lifting kit. Would not consider this a typical "4WD" recommendation ... more of an "Off Road" vehicle recommendation. Hiked from the lower trailhead, then NOT up the road BUT along the common CDT/CT Trail which adds about 5 miles roundtrip to the posted summit estimations.