Halloween Horror Nights runs select nights from September 7 through October 31 at Universal Studios Hollywood and September 1 through November 4 at Universal Orlando Resort. At Universal Studios Hollywood, the Halloween Horror Nights event starts at 7:00 p.m. and closing times vary.

In 2026, Halloween Horror Nights (HHN) at Universal Studios Hollywood officially begins at 7:00 PM each event night. However, for those looking to maximize their "scare time," the park offers Early Access Tickets, which typically allow entry as early as 5:30 PM. This is a crucial strategy because it allows guests to hit the popular lower-lot haunted houses—which are often the most crowded—before the general admission gates open at 7:00. Additionally, Universal offers an "After 2:00 PM Day/Night" combo ticket, which allows you to enjoy regular park attractions during the day and then stay for the transition into the horror event. It is important to note that the park usually closes for a short "holding" period between 5:30 and 7:00 PM to reset the "Scare Zones," but those with early access or the combo ticket are held in designated areas inside the park so they can be the first in line for the houses when they open.