Sierra Ridge is an unincorporated community and a census-designated place (CDP) located in and governed by Douglas County, Colorado, United States.

[3] The CDP is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area.

The unincorporated community lies in ZIP Code 80134.

[4] The Sierra Ridge CDP has an area of 324 acres (1.311 km2), all land.

The Douglas County School District RE-1 serves Sierra Ridge.