Children age 3 - 11 are $19.59 and Adults are $28.30. The 13 year old would be counted as an adult. These prices do include the sales tax.
I would strongly recommend going to their website. They frequently have discounts as well as events that can effect pricing and hours of operation.
Check for Groupon specials, much cheaper through Groupon.
Concessions are crazy expensive, zoo is really small.
It about 25ish...but cheaper if you get it online in advance.
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