The Vallecito Mountains are a mountain range in the Colorado Desert in eastern San Diego County, California.

They are about 28 miles (45 km) north of the Mexico–United States border.

The mountains lie in Anza-Borrego Desert State Park, in an east–west direction, southwest of the community of Ocotillo Wells, and south of Highway 78.

The range is approximately 15 miles (24 km) long, and reaches an elevation of 5,349 feet (1,630 m) above sea level at Whale Peak.

This San Diego County, California–related article is a stub.