Thorpe Park has released the opening hours for the 2020 theme park season, the first day of the season will be 27th March and the last day will be 1st November 2020. This means we now have a start date for the beginning of the 2020 Theme Park season for Thorpe Park and a potential start date for Fright Nights 2020. All of the opening hours are subject to change however it would seem some nights of Fright Nights next year could have different opening times with some nights being open 10 am till 8 pm.
https://www.thorpepark.com/resort-info/opening-times-and-travel