Elevation: 6,020 ft
This peak is not in the book. (The summit is situated on State of Idaho Land, which theoretically should be open to the public. However, the status of this particular State of Idaho land is not clear. The State of Idaho often leases its land to private entities, often under terms that exclude public access. In this case, there are no fences between the State land and the adjacent private property land, and there are “No Trespassing” signs at the only gate close to the peak.)
Livingston Douglas provided the route set out below which apparently avoids the aforementioned access problems. Updated November 2019
Packer Butte is an attractive summit located northeast of Bennett Mountain and close to ID-20 and the Mount Bennett Road. USGS Topo: Cat Creek Summit
South Face, Class 3 by Livingston Douglas
Date of Climb: October 11, 2019
From US-20 (just W of MM126), go R/S on a signed junction with Mount Bennett Road for 2.6 miles (bearing R at an unsigned junction at about the 1.0-mile mark) to reach a pullout on the S side of the road at the base of the South Face of Packer Butte. Park here (5,620 feet). There ARE clear NO TRESPASSING signs across the road and well to the East of the South Face of Packer Butte, but there is absolutely nothing indicating any problem with the South Face Route.
From the parking pullout, climb straight up the steep South Face, crossing a dilapidated cattle fence early on. The terrain is thick scrub and sagebrush. Higher up, you must scramble up through a steep section of large, somewhat unstable boulders with brush mixed in for good measure. Using your hands is mandatory here.
You will quickly reach the small, boulder-and-scrub summit. There is a cross (made of triangulation posts) on the summit high point. This route is probably the steepest, shortest route to the top of Packer Butte. While there are sections of private land along Mount Bennett Road leading to Packer Butte, there are no signs of private land (no orange paint, no “NO TRESPASSING” signs) on this route. This land is State of Idaho land and presents no issues, so enjoy the climb!
The Mount Bennett Road (no, this road does not go anywhere close to Mount Bennett) cuts across the eastern slopes of the peak. Access this signed, well-graded gravel road from ID-20 at one of two places. The first, if you are coming from the east, is just west of mile marker 126. The second, if you are coming from the west, is roughly 2 miles past the turnoff for the signed Castle Rocks Road where ID-20 makes a sharp turn to begin its ascent to Cat Creek Summit. Turn right at this point onto a well-graded gravel road. Follow the road for about 1 mile to a fork to its junction with the Mount Bennett Road.