There are I guess four standard routes (and some variations), from easiest to hardest:
1. Fish Creek Trailhead to Fish Creek Saddle to Mine Shaft Saddle to Sky High Trail to summit. Starts high and has the least elevation gain. CURRENTLY CLOSED.
2. South Fork Trailhead to Dollar Lake Saddle to summit. Medium (for San Gorgonio) elevation gain and slightly shorter than via Dry Lake. CURRENTLY CLOSED.
3. South Fork Trailhead to Dry Lake to Mine Shaft Saddle to summit. Medium (for San Gorgonio) elevation gain but slightly longer than via Dollar Lake Saddle. CURRENTLY CLOSED.
4. Vivian Creek Trailhead to High Creek to Summit. Most elevation gain, but most accessible trailhead. CURRENTLY OPEN.
Vivian Creek is the only standard route that is currently open.
There is one other route, but it's a lot of extra miles and that is:
5. Momyer Creek Trailhead to Alger Creek Trail to Falls Creek Trail to Dollar Lake Saddle to summit. CURRENTLY OPEN.
Route 5 in my opinion is best done as an overnighter. If you do it in one night, I'd spend the night at Dry Lake View or Summit Camps. Better in my opinion to do it as a two night trip with one night at High Creek and one night at Dobbs.
I discuss Route 5 in my
Six Loop Hikes in the San Gorgonio Wilderness blog post if you're interested.
HJ