The Marion Mountain trailhead can be reached off of CA 243 a few miles north of Idyllwild. There are signs indicating where to turn for the Fern Basin and Marion Mountain campgrounds. Follow them. The trailhead begins on road 4S71 between the campgrounds.
The Marion Mountain Trail is the shortest route to the summit of Mt. San Jacinto. It is fairly steep with an elevation gain of 4,600 feet in 5.7 miles. From the trailhead the Marion Mountain Trail climbs relentlessly for 2.5 miles to the junction with the Deer Springs Trail, where the trail ends. Go north on the Deer Springs Trail and soon the junction with the Seven Pines Trail is reached. Continue on the Deer Springs Trail to Little Round Valley. After passing through Little Round Valley and assending several switchbacks the junction with the short trail leading to the summit is reached. Follow this to the summit boulders and scramble to the high point.
Water. Winter gear if hiking during the winter.
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