Horseheads Central School District 2015-2016 Calendar http://horseheadscentral.tandem.co/ Key dates for Horseheads Central School District. en-us 9/9/15 First Day of School http://horseheadscentral.tandem.co/index.php?type=key_date&action=details&id=169 169-horseheadscentral@intand.com 11/25/15 - 11/27/15 Thanksgiving Break http://horseheadscentral.tandem.co/index.php?type=key_date&action=details&id=170 170-horseheadscentral@intand.com 12/24/15 - 1/1/16 Christmas Break http://horseheadscentral.tandem.co/index.php?type=key_date&action=details&id=171 171-horseheadscentral@intand.com 3/25/16 - 3/28/16 Winter Break http://horseheadscentral.tandem.co/index.php?type=key_date&action=details&id=172 172-horseheadscentral@intand.com 4/25/16 - 4/29/16 Spring Break http://horseheadscentral.tandem.co/index.php?type=key_date&action=details&id=173 173-horseheadscentral@intand.com 6/24/16 Last Day of School http://horseheadscentral.tandem.co/index.php?type=key_date&action=details&id=174 174-horseheadscentral@intand.com