Mt. Hillers is a rugged peak with steep slopes carved by narrow canyons. Mt. Hillers is 5 to 6 miles across, and is cut by several radial narrow, steep, v-shaped valleys separated by elongated, jagged ridges. Hogbacks formed from upturned sedimentary rocks flank the mountain, and are vertical in the Pink Cliffs area. Vegetation is predominantly sagebrush and pinyon-juniper woodlands on the southern slopes. Ponderosa pine, Douglas fir, and bristlecone pine grow on the northern and the higher slopes.