Guests weren't the only ones that got to cool down. The zoo filled the habitat of their North American River Otter with the snow for natural enrichment.
Two ice sculptors entertained a crowed as they sent ice flying to sculpt likenesses of the zoo's animals.
The zoo also handed out free snow cones to those that completed a scavenger hunt. The participants had to visit each of the zoo's 13 indoor, air-conditioned buildings.
RELATED: Sea lion pup revealed at Houston Zoo
RELATED: Houston Zoo llama loves the leaf blower