Old Winters Ranch/Winters Mansion, Historic ranch and mansion in Washoe County, Nevada, United States

The Old Winters Ranch/Winters Mansion, also called Rancho del Sierra, is a mansion and ranch property near Carson City, Nevada, completed in 1864 and now within the area known as old Washoe City. It is listed on the National Register of Historic Places, cited for its historical associations, its architecture and its continuing educational possibilities.

Theodore Winters constructed this mansion in 1864 using wealth accumulated from mining investments in the nearby Comstock Lode silver operations. The property became a symbol of the economic power and prosperity that mining brought to the Nevada region.

The property is also called Rancho del Sierra, a Spanish name recorded alongside Old Winters Ranch and Winters Mansion. It was listed on the National Register of Historic Places in 1974, cited for its historical associations, its architecture and its continuing educational possibilities.

The mansion stands in what is now called Old Washoe City, in Washoe County, and the coordinates place it northeast of Carson City. The site is a National Register property on private ranch land, so access is not arranged for the public; view it from the road or ask the owners before entering.

The property is also known as Rancho del Sierra, a name that appears alongside Old Winters Ranch and Winters Mansion in its National Register listing of 1974. The listing cited its historical associations, its architecture and its continuing educational possibilities.