The Border High-Siskiyous ecoregion consists of relatively high elevation mountains along the border area of Oregon and California. Elevations range from about 5,000 to greater than 7,000 feet, with a high point of 7,533 feet at Mount Ashland, Oregon. Soil temperature regimes are predominantly frigid, with some cryic at high elevations and soil moisture regimes are xeric. White fir and red fir forests occur, with some Jeffrey pine on ultramafic rocks, and a few areas of
subalpine habitats. With a large western to eastern extent, conditions are slightly drier to the east.