June 2019. Called. They said no overnight parking.

Costco Said To Park In Northwest Lot

We called ahead. They said "no problem" but we had to park it in the Northwest end of the lot. There were a few semis there. I think security stopped patrolling around 10pm. Besides the semis' generators, it was pretty quiet. We actually worked on the vehicle (underneath), while we were parked overnight. Nobody bothered us. A cop drove by once, but didn't stop.