I am not sure. Probably need to give them a call

Last winter (January 2022) I received this in my confirmation email: Campground: Jan 23 2020 - Dec 31 2070 : Santos Trailhead and Campground's gates closes at 5:00 p.m. Late arrivals should call the park before 5:00 p.m. local time to get the gate combination.

I really don’t know, I don’t remember arriving late. Best to contact the park, I do know when we stayed, the Camphosts where really close to the entrance. I guess if the gate is close, you can walk up to the Camphosts. I hope this helps