Any time
Any time of year is good at the zoo but spring and fall are the best. In the summer it's best to go when they open so you see a lot before it gets too hot. Mid-day during the cooler winter months is best.
Fall thru early Spring
It is San Diego. So hot in the summer nice in the winter.
Sumer
Depends on what you are in the mood at zoo and some day better other
I agree, october is best when have kids. Kids are free, the weather is perfect too!
In octuber all children are free, but the rest of the year is very good.
October if you have kids, since they get in for free. Adults ticket includes bus ride Kids (even if for free in October) you have to buy a $5 ticket bus if you want to ride the bus, it's not mandatory. If without kids, I think Whenever the weather seems fine to you would be a good time
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