April 13th. And yes, last year it was crazy. We showed up around 3 and they were letting people into the parking lot. We looked for the KIC group that is usually at the front and found members at least 15 feet back from where they usually are. Around 3:15, they started letting those that wanted to ride Mystic Timbers in, so we followed in a line down the right side of international street, around the Eiffel Tower towards the clock and then around Diamondback lake. From there, they stopped us and slowly let folks into the line for Mystic Timbers.
We rode the 36th train of the day around 4 and did not even try again. I was told the wait was 4 hours and snaked through the tomb raider building. We did make sure our drink plan and funpix was lined out (no issues) and got 3 rides on Diamondback, as well as 1 on Vortex and Drop Tower. We did not even try to eat, due to being happy about being back in the park and the lines.
I am guessing it is open to all passholders, new and renewing. As it says on the webpage:
A 2018 Gold or Platinum Season Pass includes many season pass benefits, including the opportunity to be among the first to experience the park’s lineup of world-class rides and attractions before Kings Island opens its gates for the start of its 47th season by attending an exclusive Gold Pass Preview Night event on April 13.
Take advantage of this Gold and Platinum season pass perk and be among the first riders of the year on Mystic Timbers, voted “Best New Ride” in 2017 by Amusement Today. Challenge The Beast, Banshee and Diamondback roller coasters. Families can enjoy spending the evening together in the 17-time, award-winning Planet Snoopy kids’ area. Classics like the Grand Carousel, K.I. & Miami Valley Railroad, Monster and Scrambler will also be waiting for its first riders of the season.
Gold Pass Preview Night also offers the first look at what’s new around the park, like new food menu items, games and merchandise.
Gold Pass Preview Night Hours: 5 p.m. - 10 p.m.