What a hidden gem!
We found this free campsite through an app on our way to Big Bear from LA. We thought there weren't any spots open because it was already 10pm by the time we got there. Luckily we found an open spot! Each spot was so spacious and gave lots of room for privacy. But some of the spots are hard to get to. So you might want to bring 4X4. Otherwise, you might have to park on the streets and haul your stuff in.