This is the drive-in we went to a couple weekends ago! It is the 99W Drive-In in Newberg and they have a neat history. The theater has been owned by the same family for three generations and they maintain a lot of the retro feel.
They have had to replace the screen a couple times after some bad storms but the posts for the car speakers are still there. They help tell you where you need to park but have no other use since the sound comes through the radio now.
When you go, plan to be there for a long time. They always play a double-feature and you want to get there early to grab a good spot. Sometimes, there is a line to get in and they might run out of spaces. We were there from about 6 PM to 2 AM. You can certainly leave after the first feature but why would you? You can bring in your own food, pets and whatever else you want to do to kill time before dusk. You can have a picnic or play catch or just hang out. You can also lay out a blanket in front of your car and watch the movie from there. If you have a truck or hatchback you can turn your car around and watch the movie from the back of the car. We go with just the normal seats because my car is a little teeny for two grown adults. But it is great for families and a totally different experience than going to a corporate owned theater.
We went right after work and didn't plan ahead with any food. But they have the best nachos and popcorn so we were happy to support the theater. They also play old trailers and concession snack bar reels. Love it!
Finally dusk arrives and you crank up your radio and curl up under a blanket.
We will definitely be making this a more regular habit!