But the place you're thinking of is Oak Glen. Coming from the west on I-10 you go through Yucaipa to get there. It's twice the elevation at about 5000 ft. (snow in winter!) so is a nice place to head to when it's sweltering down here. I was just up there last week. Oak Glen Road loops from Yucaipa up to Oak Glen then back down to Beaumont, where I lived as a kid and again some years later. We used to go up at harvest time and again to play in the snow. From no snow to a foot or more in 20 minutes!
Oak Glen is not without its faults, though. Well, one big one. It sits directly atop the San Andreas.