Its opening night for fright...at the Little Rock Zoo. Little ghosts and goblins got to strut their stuff Wednesday night at the Little Rock Zoo. The annual ‘Boo at the Zoo” gives families a safe place for trick or treating. And besides candy around every corner, kids also get to ride rides. So, whats the best part about Boo at the Zoo? Boo at the Zoo continues until Halloween night. Its $5 to get in for non-members and $4 for members of the zoo. Its every night from 6 – 9 p.m.