The Iron Mountains are a mountain range in eastern San Bernardino County, California. The southern end of the range extends into Riverside County north of Granite Pass. The range is bordered on the east by Ward Valley with the Turtle Mountains beyond. To the north lie the Old Woman Mountains. To the west across lie the Calumet Mountains. To the southwest lie the Coxcomb Mountains within Joshua Tree National Monument and to the south across Granite Pass and California State Route 62 are the Granite Mountains.