San Antonio Zoo kicks off Zoo Boo!, a fun, non-scary Halloween event for the entire family. Little ghouls and goblins are encouraged to wear their best costume to participate in a daily costume contest with a chance to win a zoo prize pack. Children of all ages and adults are welcome to dawn non-scary, family-friendly costumes. Costume masks are only permitted for children under the age of 12. Zoo Boo! is included with zoo standard admission and FREE for Members.