Mount Charleston is an unincorporated town and census-designated place in Clark County, Nevada, United States. The population was 357 at the 2010 census. Named for Mount Charleston, the highest point in the area, the town is in a valley of the Spring Mountains to the northwest of Las Vegas, noted for its hiking trails, and for the Mount Charleston Lodge, a rustic hotel. Temperatures are from 20 to 30 °F lower than in Las Vegas, making it a popular place for Las Vegans to escape the heat. According to the United States Census Bureau, the census-designated place (CDP) of Mount Charleston (which may not coincide exactly with the town boundaries) has a total area of 29.4 square miles (76 km sq), all of it land.