Yes, I am sure that at this time the trails at Tamarancho close at 8pm. This was confirmed earlier this month in an email between the caretaker at the camp, the scout CEO, and me:
This is the email from Dana Hanley (who is the caretaker at the Camp) and it was copied to Michael Dybeck, who is the Boy Scout CEO. The date is Dec 6, 2014. It was in response to my question about when the camp is closed at night.
Danny Forer
Tamarancho Bike Coordinator
"Danny, several years ago we decided that 8pm was a reasonable time to ask people to off the trails. 8pm gives me a little leverage with night riders being to loud (ghetto blasting) or annoying campers. Thanks Dana"