is the san diego zoo open on christmas day

Well, that depends on what year we're talking about! In some years, the San Diego Zoo has been open on Christmas Day, while in others, it's been closed. For example, the zoo was open in 2015 and 2016 but closed in 2017 and 2018. So if you're thinking of visiting the San Diego Zoo on Christmas Day, you'll want to check with the zoo ahead of time to make sure it's open.