Upper montane forest
The upper montane forest is a vegetation type generally found above the mixed coniferous forest and below the subalpine forest vegetation types. Most of what grows in upper montane forests are conifers, because of the short growing season. Pike and San Isabel National Forests. In the Pike National Forest and San Isabel National Forest of the Rocky Mountains, the upper montane forest is also called the "moist forest", with the mixed coniferous below called "dry forest", and the subalpine forest above called "cold forest". Stands may have a shade intolerant ponderosa pine ("Pinus ponderosa") overstory, and a  shade tolerant Douglas-fir ("Pseudotsuga menziesii") or white fir ("Abies concolor") understory. Lassen Volcanic Park. In Lassen Volcanic Park at the southern end of the Cascade Range, the upper montane forest is also known as red fir forest. It has less diversity than the mixed coniferous forest below. It occurs between , consists of dense stands of red fir ("Abies magnifica"), and has little understory and few animals. In the western areas that are more open, western white pine ("Pinus monticola") can commonly be found. Lodgepole pine ("Pinus contorta") occurs in areas of thin soils. Summer temperatures are low in the  almost total shade of the red fir. Sierra Nevada range. On the western slopes of the Sierra Nevada range, upper montane vegetation can be found at elevations from in the northern part of the range, in the central part, and in the southern part. On the eastern slopes, it is at higher elevations. Precipitation in areas of upper montane forest vegetation type is , mostly as snowfall. Summer high temperatures range from , and winter lows are below . Growing season is about four months because of long-lasting, deep snow. Overstory trees are typically cone shaped to shed the snow, with characteristic  trees including lodgepole pine ("Pinus contorta"), Jeffrey pine ("Pinus jeffreyi"), western white pine ("Pinus monticola") California red fir ("Abies magnifica"), and Sierra juniper ("Juniperus grandis"), and typical understory trees and shrubs such as huckleberry oak ("Quercus vaccinifolia") and red heather ("Phyllodoce breweri"). The fire return interval is about 50-70 years. The soils in this zone is mainly granitic, and are fast-draining and acidic. The soil is mostly covered in needle litter: the understory has little vegetation.