Working days, in the morning
Tuesday thru Thursday
I agree with everyone else. As someone who frequently visits zoos, it's a better choice to go in the early morning of a weekday. Avoid the crowd and get a better view for your kiddo.
Go during the week when school is in session. I made the mistake of going to the zoo when several schools had field trips to the zoo that day. It was terribly crowded. I recommend calling the zoo to see if they are expecting any large groups on the day you want to go.
We were there in the morning during the week with school. Even with multiple school trips there it was still not what I would call crowded.
I want to say as soon as they open during the week.
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