Long Mountain, at 8,621 feet, is the highest point in Cascade County, Montana. This mountain sees relatively few ascents compared to neighboring Big Baldy. During my ascent I did not see anyone else. With the growing interest in County Highpointing use may increase eventually. Views from the summit on a clear day offer spectacular views of the Little Belt, Big Belt, and Highwood mountain ranges. Although there is no trail to the summit, Long Mountain is not a difficult mountain to climb. The route I used never exceeds class 2 with easy bushwhacking, although a more difficult route up is probably possible.
From Great Falls head east on U.S. 87 for 20 miles to Armington.
From the start of the route follow trail 753 at 7,500 ft until you reach a lush meadow after approximately 1.5 miles. There are several ups and downs adding to overall elevation gain and loss. Once in the meadow you will see the ridge you will take leading to Long Mountain. Follow trail 753 in a northwesterly direction until reaching a trail junction at 46.95716N, 110.66386W. Go left (southwest) on this trail. Follow it as it zig zags through the forest. At some point you will need to leave the trail and bushwhack your way up the ridge leading to Long Mountain. The possibilities are endless, but I chose a spot at 46.95716N, 110.66386W, which worked for me.
Once you leave the trail continue in a southwesterly direction as you gain the ridge through mostly open forest. Eventually you will reach the first boulder field at 46.94769N, 110.67689W. Boulder hopping is completely avoidable if you look for a group of trees and shrubs extending from the top of the boulder field and go up there. Once past the boulder field follow the obvious west southwest route to the false summit. I decided to go up and over the false summit to take in all the views. The false summit is completely avoidable, but not hard at all. Once you reach this point you will travel over a decent sized boulder field made of large stable rock and learn why Long Mountain earned its name. Continue west until you reach the base of the summit and boulder hop to the top at 46.94361N, 110.69222W. Overall trip is approximately 6.5 miles RT with maybe 1,500 feet of gain if you count all the ups and downs on trail 753.