How to get there:
Take Frazier Mountain Park Road west from I-5. (This is the exit after Gorman when driving north on I-5.) Keep right in Lake of the Woods, onto Lockwood Valley Road. Fork left again onto Frazier Mountain Road after about 0.87 miles. This road is paved up to a campground, then dirt. High clearance is recommended, but a normal car might get up with careful driving. The road leads all the way to the summit where you find antennas and an old fire lookout tower.
It had taken well over an hour to drive back down from Alamo Mountain, the sun had gone down and the time was rapidly moving towards 1900. It did look from my map as if One could drive to the top of Frazier, very tempting to give it a try before returning to LA.
I ´drove up from I-5 and located the correct Forest Service road without wasting much time. Arriving at 1925, the west sky was still glowing red shortly after sunset. I explored the old fire lookout giving a slightly better view above the trees. Next in order was a careful driving descent, then return to LA on I-5, then I-405.