From the trailhead at 10 km up the road, you will have to cross the landslide. The landslide cuts across at a fairly steep angle and the small rocks are loose and will slide down as you walk across, but it is not overly difficult. You can walk up and around the landslide through the bushes, but this will take a little longer and the bank is steep. At the far end of the landslide, it is easiest to head down to the stream that cuts through and walk up the stream back to the road.
Continue walking up the road for another 2.5 km where you will reach a fork in the road and come to an open plateau. Montana Mountain is directly in front of you. Take the road to the right and either follow it as it winds it's way to the mountain, or walk across the plateau and intersect the road.
After about 2 kms you have a choice of how to climb up the mountain. You can either take the ridge on the far right and walk along the long ridge to the summit, or you can walk straight ahead and climb up the couloir to the saddle between the ridge and the summit. Both options are fairly easy, the ridge being a longer scenic route and the couloir a more direct route. If there is snow in the couloir, it can be easier than walking up scree rock on the ridge (and you can slide down it on the descent). If you can't decide, then do a loop by going up one way and coming down the other.
To get to the couloir, walk up the road towards the ridge to your left (this ridge has a formidable black, rocky knob on it). There is a small tarn below the ridge cirque. The couloir is straight up from this alpine tarn. If there is still snow in the couloir, cut up it at an angle on the first steep section, and then just walk straight up to the saddle below the summit. It is a quick scramble up to the summit from the saddle.
If you want to walk along the ridge, follow the road leading to the right-most ridge. Once on the top you can easily walk along it (and the worn-out sheep trail) towards the saddle below the summit.
From the summit, you get a 360 degree view of the area. You can see Grey Mountain
near Whitehorse, Mount Skukum
on the Annie Lake road, Bennett Lake, Tutshi Lake, Tagish Lake, and all the way down the White Pass and Chilkoot area.
There is a repeater station further down on the Montana ridge which you can walk to if you wish (note that the repeater is not on the true summit). The mountain behind Montana (south-east) with the steep rock face is Mount Matheson. Looking back towards Carcross (north) slightly to the left (north-east) is Brute Mountain. The bump slightly to the right (north-west) in the same direction is Sugarloaf Hill.