Granite Peak - Montana Highpoint Professional Review and Guide
"Highpoint rank by height: 10th. Granite Peak was the last of the fifty state highpoints to be climbed. It wasn't until August 23, 1923 that a party of three climbers finally made the summit. Three factors can contribute to making this a most memorable trip. First, it is almost a sure bet that you will have to endure at least one severe lightning/hail storm. Second, either the mosquitoes or various rodents will conspire to make your waking hours a living hell.
The best time (is this an oxymoron or what!) to climb Granite is purported to be in August. WARNING: This is not a peak to be attempted during a period of potentially severe weather, as it is a very serious undertaking. Take enough provisions with you to wait out the weather and make the climb on another day. You may need to melt snow for water at your high camp on Froze to Death Plateau, so plan accordingly. Froze to Death Plateau... Tempest Mountain — sounds like Edgar Allen Poe slept here. These names should give you some indication of the notorious weather of this area. Remember, if you can't take a joke, you shouldn't be out there climbing. I'm sure this climb has been done as a day hike, but for the normal human being, a multi-day backpack/climb seems like the more intelligent choice."