Miller Peak is a large commercial communications site. Given that, the road accessible to the public is narrow, brushy and with few places to pass on coming vehicles. The road can become a bit crowded in later summer if a huckleberry crop along the road entices pickers.
I suspect that access to the commercial site is from the north which is inaccessible to the public. Caution: There are two different communication sites behind the gate. If the gate is open near the summit and you elect to drive through insure that a vehicle will not come out ahead of you and 'trap' you behind the gate. It could make for a long wait.
The summit has few distant views as it is heavily forested.
Elevation gain: 200’
Off trail miles: Less than 0.5 round trip
Water: There is no good water source.
Bear Pepper Spray: Highly recommended in all Montana summits.
Maps: US Forest Service, Lolo National Forest, Missoula Ranger District
Directions: From Missoula take the upper Miller Creek Road onto County Road 37 to its end and then follow FS roads 364 to 4245 to Holloman Saddle approximately 5 miles. At Holloman Saddle travel road 2127, 2172 & 2134 approximately 4.5 miles to a road closure gate just below the summit. Walk the road to the summit, about 0.5 mile or go up the road a few hundred feet to an open grassy slope and hike up to the summit directly, about 0.1 mile.