I went during March when the forest road leading to it (9N27) was closed from highway 95. I parked at the gate and walked the 1/2 with my gear. Made two trips. Was snowy and muddy and temp got to around 33 that night with 15 mph winds. Spacious campground. Black bear sign a few weeks old and also saw a bobcat. Mountains on all sides makes for a nice campground. It feels remote while being easy to access and I’d recommend.
* this review refers to the Oak Flat campground along the Sespe trail and is accessible by backpackers only, 7 miles from Piedra Blaca parking lot*.
We camped right before Oak flat and right along the Sespe river (15 yards away). There’s a path that goes down from the main trail, and the campsite is right there under a tree. Fire pit is there (stone). We filled up our water at a spot about 39 yards upstream, just bc it’s flowing better. Nearest other campers were out of sight. Busy enough to feel safe, quiet enough to have peace and feel like you’re alone. 7.3 miles to our spot from Piedra Blanca parking.