BOO! at the ZOO is finally here! 🎃 Tonight we kick off one of Knoxville’s favorite Halloween traditions with the 39th annual BOO! at the ZOO! Enjoy a not-too-scary night of trick-or-treating, the Monster Mash dance party, costumed characters, and the Treat Trail filled with sweets and surprises. Don’t miss the Not-Too-Scary Haunted Graveyard, the BOO! Choo Train, and all your favorite Halloween fun under the lights! Gates open at 5:30 p.m., and the fun continues through 8:00 p.m. each night, Oc