Calabasas is a city in Los Angeles County, California, United States, located in the hills west of the San Fernando Valley and in the northwest Santa Monica Mountains between Woodland Hills, Agoura Hills, West Hills, Hidden Hills, and Malibu, California. The Leonis Adobe, an adobe structure in Old Town Calabasas, dates from 1844 and is one of the oldest surviving buildings in greater Los Angeles. The city was formally incorporated in 1991. As of the 2010 census, the city's population was 23,058
Calabasas has a total area of 13.0 square miles (34 km2)—12.9 square miles (33 km2) of it is land and 0.1 square miles (0.26 km2) of it (0.38%) is covered by water.
In Calabasas, the summers are warm, arid, and clear and the winters are long, cool, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 45°F to 82°F and is rarely below 38°F or above 91°F.