Universal Orlando Announces Halloween Horror Nights® 2015! Can you believe it?! It’s only March and Universal is already talking about this event. It’s easy to know why. Halloween Horror Nights is one of their most well known events and this year is an important one being that HHN is now in it’s 25th year! On select nights from September 18th up until November 1st, 2015, the streets at Universal Studios will be a thrilling sight full of mutants, monsters, and maniacs. Check out the video below for more information on this awesome event!