The OKC Zoo has announced it's modifying its hours during this heat wave out of concern for zoo-goers. Opening a little earlier during the cooler portion of the day, and closing in the early afternoon before the heat of the day sets in. The OKC Zoo does this when the temperatures get this hot outside. If you'd like to make or modify your OKC Zoo plans, be sure to check out the huge exhibit they have going on right now - the Dinosaur Expedition. Unique Things to Do in Oklahoma City There is no shortage of things to do in OKC.