I didn’t know there are still ANY drive-in theaters open. Glad to hear otherwise! I had really assumed none remain, because none of those I grew up with survived past the early 1980’s.
If I use Google satellite maps and Streetview I can find faint traces of them in the landscape, pieces of the old signs still sticking out of the ground or something like that. Stuff that would never be noticed by anyone not specifically looking for it.
There is an old school drive-in theater in Parma, Idaho. The double feature lets out around 2 am.