Shot with HP Photosmart R717 stitched with free software.
Granite Peak is the highest point in Montana. Most topo maps and references list it as 12,799' high as originally surveyed. However, new information, probably GPS, lists it as 12,804' or 12,807' high depending on the reference site. Suffice it to say that it is about 12,800' +/_ a few.
Most people that attempt the summit take 2-4 days for the approach, climb, and hike back to the parking lot (about 32 - 34 miles total). Some very aggressive hikers and climbers can make it parking lot-to summit-to -parking lot in less than a day (not me). Some people climb the last several hundred feet without ropes or aids. I think most people use rappel rope to descend (as did I). The route can be tricky but route finding information can be obtained at the local outdoor sports stores in Billings or Red Lodge, MT, or on many sites online.