Distance: 18.6 miles (out and back) Elevation Gain: 5,400 feet Peak Elevation: 11,503 feet Objective: Summit San Gorgonio Mountain via Vivian Creek, San Bernardino Mountains, California Difficulty: Strenuous Cautions: Altitude sickness, lightning Best Months: July to September Permits: Wilderness permit San Gorgonio Mountain, aka Old Greyback, is the highest mountain in Southern California. It is also … Continue reading Summit San Gorgonio Mountain via Vivian Creek