High Quality Content by WIKIPEDIA articles! The San Jacinto Mountains are a mountain range east of Los Angeles in southern California in the United States.The mountains are named for Saint Hyacinth (San Jacinto in Spanish). The Pacific Crest Trail runs along the spine of the range. The range extends for approximately 30 mi (48 km) from the San Bernardino Mountains southeast to the Santa Rosa Mountains. The San Jacinto Mountains are the northernmost of the Peninsular Ranges, which run 1500 km (900 miles) from Southern California to the southern tip of the Baja California Peninsula. The highest peak in the range is San Jacinto Peak (3,302 m)(10,834 ft).